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arXiv 2022年

作者： Zhang, Yichen Gao, Yuxiang Gao, Xue-Jian Lei, Shiming Ni, Zhuoliang Oh, Ji Seop Huang, Jianwei Yue, Ziqin Zonno, Marta Gorovikov, Sergey Hashimoto, Makoto Lu, Donghui Denlinger, Jonathan D. Birgeneau, Robert J. Kono, Junichiro Wu, Liang Law, Kam Tuen Morosan, Emilia Yi, Ming Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong Department of Physics and Astronomy University of Pennsylvania PhiladelphiaPA19104 United States Department of Physics University of California BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Canadian Light Source Inc. 44 Innovation Boulevard SaskatoonSKS7N 2V3 Canada Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Advanced Light Source Lawrence Berekeley National Laboratory BerkeleyCA94720 United States Materials Science Division Lawrence Berekeley National Laboratory BerkeleyCA94720 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Department of Materials Science and Nanoengineering Rice University HoustonTX77005 United States

Kramers nodal lines (KNLs) have recently been proposed theoretically as a special type of Weyl line degeneracy connecting time-reversal invariant momenta. KNLs are robust to spin orbit coupling and are inherent to all non-centrosymmetric achiral crystal structures, leading to unusual spin, magneto-electric, and optical properties. However, their existence in in real quantum materials has not been experimentally established. Here we gather the experimental evidence pointing at the presence of KNLs in SmAlSi, a non-centrosymmetric metal that develops incommensurate spin density wave order at low temperature. Using angle-resolved photoemission spectroscopy, density functional theory calculations, and magneto-transport methods, we provide evidence suggesting the presence of KNLs, together with observing Weyl fermions under the broken inversion symmetry in the paramagnetic phase of SmAlSi. We discuss the nesting possibilities regarding the emergent magnetic orders in SmAlSi. Our results provide a solid basis of experimental observations for exploring correlated topology in SmAlSi. © 2022, CC BY-NC-SA.

关键词： Temperature

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A weak topological insulator state in quasi-one-dimensional superconductor TaSe3

arXiv

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arXiv 2020年

作者： Hyun, Jounghoon Jeong, Min Yong Kim, Sunghun Jung, Myung-Chul Lee, Yeonghoon Lim, Chan-Young Cha, Jaehun Lee, Gyubin An, Yeojin Hashimoto, Makoto Lu, Donghui Denlinger, Jonathan D. Han, Myung Joon Kim, Yeongkwan Department of Physics Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of Stanford Synchrotron Radiation Lightsource Stanford Linear Accelerator Center Menlo ParkCA94025 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Graduate School of Nanoscience and Technology Korea Advanced Institute of Science and Technology Daejeon34141 Korea Republic of

A well-established way to find novel Majorana particles in a solid-state system is to have superconductivity arising from the topological electronic structure. To this end, the heterostructure systems that consist of normal superconductor and topological material have been actively explored in the past decade. However, a search for the single material system that simultaneously exhibits intrinsic superconductivity and topological phase has been largely limited, although such a system is far more favorable especially for the quantum device applications. Here, we report the electronic structure study of a quasi-one-dimensional (q1D) superconductor TaSe3. Our results of angle-resolved photoemission spectroscopy (ARPES) and first-principles calculation clearly show that TaSe3 is a topological superconductor. The characteristic bulk inversion gap, in-gap state and its shape of non-Dirac dispersion concurrently point to the topologically nontrivial nature of this material. The further investigations of the Z2 indices and the topologically distinctive surface band crossings disclose that it belongs to the weak topological insulator (WTI) class. Hereby, TaSe3 becomes the first verified example of an intrinsic 1D topological superconductor. It hopefully provides a promising platform for future applications utilizing Majorana bound states localized at the end of 1D intrinsic topological superconductors. Copyright © 2020, The Authors. All rights reserved.

关键词： Selenium compounds

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Direct momentum imaging of charge transfer following site-selective ionization

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Physical Review A 2023年第4期108卷 043113-043113页

作者： Felix Allum Yoshiaki Kumagai Kiyonobu Nagaya James Harries Hiroshi Iwayama Mathew Britton Philip H. Bucksbaum Michael Burt Mark Brouard Briony Downes-Ward Taran Driver David Heathcote Paul Hockett Andrew J. Howard Jason W. L. Lee Yusong Liu Edwin Kukk Joseph W. McManus Dennis Milsesevic Akinobu Niozu Johannes Niskanen Andrew J. Orr-Ewing Shigeki Owada Patrick A. Robertson Artem Rudenko Kiyoshi Ueda James Unwin Claire Vallance Tiffany Walmsley Russell S. Minns Daniel Rolles Michael N. R. Ashfold Ruaridh Forbes Chemistry Research Laboratory Department of Chemistry University of Oxford Oxford OX1 3TA UK PULSE Institute SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Linac Coherent Light Source SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Applied Physics Tokyo University of Agriculture and Technology Tokyo Japan Department of Physics Kyoto University Kyoto 606-8502 Japan QST SPring-8 Kouto 1-1-1 Sayo Hyogo Japan Institute for Molecular Science Okazaki 444-8585 Japan Sokendai (The Graduate University for Advanced Studies) Okazaki 444-8585 Japan School of Chemistry University of Southampton Highfield Southampton SO17 1BJ UK National Research Council of Canada 100 Sussex Dr. Ottawa ON K1A 0R6 Canada Deutsches Elektronen-Synchrotron DESY Hamburg Germany Department of Physics and Astronomy University of Turku FI-20014 Turku Finland Graduate School of Advanced Science and Engineering Hiroshima University Higashi-Hiroshima 739-8526 Japan School of Chemistry University of Bristol Cantock's Close Bristol BS8 1TS UK RIKEN SPring-8 Center Sayo Hyogo 679-5148 Japan Japan Synchrotron Radiation Research Institute Sayo Hyogo 679-5198 Japan J.R. Macdonald Laboratory Department of Physics Kansas State University Manhattan Kansas 66506 USA Department of Chemistry Tohoku University Sendai 980-8578 Japan

We study ultrafast charge rearrangement in dissociating 2-iodopropane (2−C3H7I) using site-selective core ionization at the iodine atom. Clear signatures of electron transfer between the neutral propyl fragment and multiply charged iodine ions are observed in the recorded delay-dependent ion momentum distributions. The detected charge-transfer pathway is only favorable within a small (few angstroms), charge-state-dependent spatial window located at C-I distances longer than that of the neutral ground-state molecule. These results offer insights into the physics underpinning charge transfer in isolated molecules and pave the way for a different class of time-resolved studies.

关键词： Autoionization & Auger processes Electronic excitation & ionization Electronic structure of atoms & molecules Multiphoton or tunneling ionization & excitation Photoemission Single- and few-photon ionization & excitation Ultrafast phenomena

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Weyl nodal ring states and Landau quantization with very large magnetoresistance in square-net magnet EuGa4

arXiv

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arXiv 2022年

作者： Lei, Shiming Allen, Kevin Huang, Jianwei Moya, Jaime M. Wu, Tsz Chun Casas, Brian Zhang, Yichen Oh, Ji Seop Hashimoto, Makoto Lu, Donghui Denlinger, Jonathan Jozwiak, Chris Bostwick, Aaron Rotenberg, Eli Balicas, Luis Birgeneau, Robert Foster, Matthew S. Yi, Ming Sun, Yan Morosan, Emilia Department of Physics and Astronomy Rice University HoustonTX77005 United States Applied Physics Graduate Program Rice University HoustonTX77005 United States National High Magnetic Field Laboratory TallahasseeFL32310 United States Department of Physics University of California BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics Florida State University TallahasseeFL32306 United States Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Rice Center for Quantum Materials Rice University HoustonTX77005 United States Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences China

Magnetic topological semimetals (TSMs) allow for an effective control of the topological electronic states by tuning the spin configuration, and therefore are promising materials for next-generation electronic and spintronic applications. Of magnetic TSMs, Weyl nodal-line (NL) semimetals likely have the most tunability, and yet they are the least experimentally studied so far due to the scarcity of material candidates. Here, using a combination of angle-resolved photoemission spectroscopy and quantum oscillation measurements, together with density functional theory calculations, we identify the square-net compound EuGa4 as a new magnetic Weyl nodal ring (NR) semimetal, in which the line nodes form closed rings in the vicinity of the Fermi level. Remarkably, the Weyl NR states show distinct Landau quantization with clear spin splitting upon application of a magnetic field. At 2 K in a field of 14 T, the transverse magnetoresistance of EuGa4 exceeds 200,000%, which is more than two orders of magnitude larger than that of other known magnetic TSMs. High field magnetoresistance measurements indicate no saturation up to 40 T. Our theoretical model indicates that the nonsaturating MR naturally arises as a consequence of the Weyl NR state. Our work thus point to the realization of Weyl NR states in square-net magnetic materials, and opens new avenues for the design of magnetic TSMs with very large magnetoresistance. Copyright © 2022, The Authors. All rights reserved.

关键词： Density functional theory

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Nanoscale visualization and spectral fingerprints of the charge order in ScV6Sn6 distinct from other kagome metals

arXiv

引用

arXiv 2023年

作者： Cheng, Siyu Ren, Zheng Li, Hong Oh, Ji Seop Tan, Hengxin Pokharel, Ganesh DeStefano, Jonathan M. Rosenberg, Elliott Guo, Yucheng Zhang, Yichen Yue, Ziqin Lee, Yongbin Gorovikov, Sergey Zonno, Marta Hashimoto, Makoto Lu, Donghui Ke, Liqin Mazzola, Federico Kono, Junichiro Birgeneau, R.J. Chu, Jiun-Haw Wilson, Stephen D. Wang, Ziqiang Yan, Binghai Yi, Ming Zeljkovic, Ilija Department of Physics Boston College Chestnut HillMA02467 United States Department of Physics and Astronomy Rice University HoustonTX77005 United States Department of Physics University of California BerkeleyCA94720 United States Department of Condensed Matter Physics Weizmann Institute of Science Rehovot Israel Materials Department University of California Santa Barbara Santa BarbaraCA93106 United States Department of Physics University of Washington SeattleWA98195 United States Ames Laboratory AmesIA50011 United States Canadian Light Source Inc. 44 Innovation Boulevard SaskatoonSKS7N 2V3 Canada Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States CNR Laboratorio TASC Area Science Park S.S.14 km 163.5 TriesteI-34149 Italy Department of Molecular Sciences and Nanosystems Ca' Foscari University of Venice Venice30172 Italy Materials Science Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Applied Physics Graduate Program Smalley‐Curl Institute Rice University HoustonTX77005 United States

Charge density waves (CDWs) have been tied to a number of unusual phenomena in kagome metals, including rotation symmetry breaking, time‐reversal symmetry breaking and superconductivity. The majority of the experiments in kagome metals thus far have focused on the CDW states in AV3Sb5 (A=K, Cs, Rb) and FeGe, characterized by the 2a0 by 2a0 CDW period in the kagome plane. Recently, a bulk CDW phase (TCDW ≈ 92 K) with an entirely different wave length and orientation has been reported in ScV6Sn6, as the first realization of a CDW state in the broad RM6X6 crystal structure. Here, using a combination of scanning tunneling microscopy/spectroscopy and angle‐resolved photoemission spectroscopy, we reveal the microscopic structure and the spectroscopic signatures of this charge ordering phase in ScV6Sn6. Differential conductance dI/dV spectra show a partial gap opening in the density‐of‐states of about 20 meV at the Fermi level. This is much smaller than the spectral gaps observed in AV3Sb5 and FeGe despite the comparable TCDW temperatures in these systems, suggesting substantially weaker coupling strength in ScV6Sn6. Surprisingly, despite the three‐dimensional bulk nature of the charge order, we find that the charge modulation is only observed on the kagome termination. Temperature‐dependent band structure evolution suggests a modulation of the surface states as a consequence of the emergent charge order, with an abrupt spectral weight shift below TCDW consistent with the first‐order phase transition. The similarity of the electronic band structures of ScV6Sn6 and TbV6Sn6 (where the charge ordering is absent), together with the first‐principle calculations, suggests that charge ordering in ScV6Sn6 may not be primarily electronically driven. Interestingly, in sharp contrast to the CDW state of cousin AV3Sb5, we find no evidence supporting rotation symmetry breaking. Our results reveal a distinctive nature of the charge ordering phase in ScV6Sn6 in comparison to other kagome

关键词： Charge density waves

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Two-Step Electronic Response to Magnetic Ordering in a van der Waals Ferromagnet

arXiv

引用

arXiv 2023年

作者： Wu, Han Zhu, Jian-Xin Chen, Lebing Butcher, Matthew W. Yue, Ziqin Yuan, Dongsheng He, Yu Oh, Ji Seop Huang, Jianwei Wu, Shan Gong, Cheng Guo, Yucheng Mo, Sung-Kwan Denlinger, Jonathan D. Lu, Donghui Hashimoto, Makoto Stone, Matthew B. Kolesnikov, Alexander I. Chi, Songxue Kono, Junichiro Nevidomskyy, Andriy H. Birgeneau, Robert J. Dai, Pengcheng Yi, Ming Department of Physics and Astronomy Rice Center for Quantum Materials Rice University HoustonTX77005 United States Theoretical Division Los Alamos National Laboratory Los AlamosNM87545 United States Center for Integrated Nanotechnologies Los Alamos National Laboratory Los AlamosNM87545 United States Department of Physics University of California at Berkeley BerkeleyCA94720 United States Applied Physics Graduate Program Smalley-Curl Institute Rice University HoustonTX77005 United States Materials Sciences Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 1-1 Namiki Ibaraki Tsukuba305-0044 Japan Department of Applied Physics Yale University New HavenCT06511 United States Department of Electrical and Computer Engineering Quantum Technology Center University of Maryland College ParkMD20742 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Neutron Scattering Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Electrical and Computer Engineering Rice University HoustonTX77005 United States Smalley-Curl Institute Rice University HoustonTX77005 United States Department of Material Science and NanoEngineering Rice University HoustonTX77005 United States Department of Materials Science and Engineering University of California Berkeley United States

The two-dimensional (2D) material Cr2Ge2Te6 is a member of the class of insulating van der Waals magnets. Here, using high resolution angle-resolved photoemission spectroscopy in a detailed temperature dependence study, we identify a clear response of the electronic structure to a dimensional crossover in the form of two distinct temperature scales marking onsets of modifications in the electronic structure. Specifically, we observe Te p-orbital-dominated bands to undergo changes at the Curie transition temperature TC while the Cr d-orbital-dominated bands begin evolving at a higher temperature scale. Combined with neutron scattering, density functional theory calculations, and Monte Carlo simulations, we find that the electronic system can be consistently understood to respond sequentially to the distinct temperatures at which in-plane and out-of-plane spin correlations exceed a characteristic length scale. Our findings reveal the sensitivity of the orbital-selective electronic structure for probing the dynamical evolution of local moment correlations in vdW insulating magnets. © 2023, CC BY.

关键词： Electronic structure

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Front Cover: Redox Reaction in Ti−Mn Redox Flow Battery Studied by X-ray Absorption Spectroscopy (Chem. Asian J. 1/2023)

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Chemistry – An Asian Journal 2022年第1期18卷

作者： Dr. Daisuke Asakura Dr. Eiji Hosono Dr. Miho Kitamura Dr. Koji Horiba Dr. Eisuke Magome Dr. Hiroyuki Setoyama Dr. Eiichi Kobayashi Dr. Hayato Yuzawa Dr. Takuji Ohigashi Dr. Takaaki Sakai Dr. Ryoichi Kanega Dr. Takashi Funaki Dr. Yukari Sato Dr. Akihiro Ohira Research Institute for Energy Conservation National Institute of Advanced Industrial Science and Technology (AIST) 1-1-1 Higashi Tsukuba Ibaraki 305-8565 Japan Global Zero Emission Research Center National Institute of Advanced Industrial Science and Technology (AIST) 16-1 Onogawa Tsukuba Ibaraki 305-8569 Japan AIST-University of Tokyo Advanced Operando-Measurement Open Innovation Laboratory 5-1-5 Kashiwanoha Kashiwa Chiba 277-8565 Japan Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) 1-1 Oho Tsukuba Ibaraki 305-0801 Japan SOKENDAI The Graduate University for Advanced Studies 1-1 Oho Tsukuba Ibaraki 305-0801 Japan Institute for Advanced Synchrotron Light Source National Institutes for Quantum Science and Technology (QST) 6-6-11-901 Aoba Aramaki Aoba-ku Sendai Miyagi 980-8579 Japan SAGA Light Source Kyushu Synchrotron Light Research Center 8-7 Yayoigaoka Tosu Saga 841-0005 Japan UVSOR Synchrotron Facility Institute for Molecular Science (IMS) 38 Nishigo-Naka Myodaiji Okazaki Aichi 444-8585 Japan

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Spintronic superconductor in a bulk layered material with natural spin-valve structure

arXiv

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arXiv 2020年

作者： Sakuragi, Shunsuke Sasaki, S. Akashi, R. Sakagami, R. Kuroda, K. Bareille, C. Hashimoto, T. Nagashima, T. Kinoshita, Y. Hirata, Y. Shimozawa, M. Asai, S. Yajima, T. Doi, S. Tsujimoto, N. Kunisada, S. Noguchi, R. Kurokawa, K. Azuma, N. Hirata, K. Yamasaki, Y. Nakao, H. Kim, T.K. Cacho, C. Masuda, T. Tokunaga, M. Wadati, H. Okazaki, K. Shin, S. Kamihara, Y. Yamashita, Minoru Kondo, Takeshi Institute for Solid State Physics University of Tokyo Kashiwa Chiba Japan Department of Physics University of Tokyo Tokyo Japan Department of Applied Physics and Phisico-Informatics Keio University Yokohama Japan Department of Applied Physics National Defense Academy of Japan Yokosuka Japan Division of Materials Physics Graduate School of Engineering Science Osaka University Toyonaka Japan Research Center for Computational Design of Advanced Functional Materials National Institute of Advanced Industrial Science and Technology Tsukuba Japan Research and Services Division of Materials Data and Integrated System National Institute for Materials Science Tsukuba Japan RIKEN Center for Emergent Matter Science Wako Japan PRESTO Japan Science and Technology Agency Kawaguchi Japan Condensed Matter Research Center and Photon Factory Institute of Materials Structure Science High Energy Accelerator Research Organization Tsukuba Japan Diamond Light Source Harwell Campus Didcot United Kingdom Graduate School of Material Science University of Hyogo Hyogo Japan TheUniversity of Tokyo Kashiwa Chiba277-8581 Japan Center for Spintronics Research Network Keio University Yokohama Japan

Multi-layered materials provide fascinating platforms to realize various functional properties, possibly leading to future electronic devices controlled by external fields. In particular, layered magnets coupled with conducting layers have been extensively studied recently for possible control of their transport properties via the spin structure. Successful control of quantum-transport properties in the materials with antiferromagnetic (AFM) layers, so-called natural spin-valve structure, has been reported for the Dirac Fermion and topological/axion materials [1-11]. However, a bulk crystal in which magnetic and superconducting layers are alternately stacked has not been realized until now, and the search for functional properties in it is an interesting yet unexplored field in material science. Here, we discover superconductivity providing such an ideal platform in EuSn2As2 with the van der Waals stacking of magnetic Eu layers and superconducting Sn-As layers, and present the first demonstration of a natural spin-valve effect on the superconducting current. Below the superconducting transition temperature (Tc), the electrical resistivity becomes zero in the in-plane direction. In contrast, it, surprisingly, remains finite down to the lowest temperature in the out-of-plane direction, mostly due to the structure of intrinsic magnetic Josephson junctions in EuSn2As2. The magnetic order of the Eu layers (or natural spin-valve) is observed to be extremely soft, allowing one to easy control of the out-of-plane to in-plane resistivities ratio from 1 to ∞ by weak external magnetic fields. The concept of multi-functional materials with stacked magnetic-superconducting layers will open a new pathway to develop novel spintronic devices with magnetically controllable superconductivity. Copyright © 2020, The Authors. All rights reserved.

关键词： Europium compounds

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Kramers nodal lines in intercalated TaS2 superconductors

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Nature Communications 2025年第1期16卷 1-10页

作者： Yichen Zhang Yuxiang Gao Jianwei Huang Yucheng Guo Ziqin Yue Ji Seop Oh Junichiro Kono Emilia Morosan Ming Yi Aki Pulkkinen Alberto Marmodoro Ján Minár Xingyao Guo Xue-Jian Gao Kam Tuen Law Robert J. Birgeneau Alex Moon Luis Balicas Mohamed Oudah Alannah M. Hallas Alexei Fedorov Sung-Kwan Mo Makoto Hashimoto Donghui Lu Anil Rajapitamahuni Elio Vescovo Pavan Hosur Department of Physics and Astronomy Rice University Houston TX 77005 USA Applied Physics Graduate Program Smalley-Curl Institute Rice University Houston TX 77005 USA Department of Physics University of California Berkeley Berkeley CA 94720 USA Rice Center for Quantum Materials Rice University Houston TX 77005 USA Department of Electrical and Computer Engineering Rice University Houston TX 77005 USA Department of Materials Science and NanoEngineering Rice University Houston TX 77005 USA Smalley-Curl Institute Rice University Houston TX 77005 USA New Technologies Research Center University of West Bohemia Plzen 301 00 Czech Republic Department of Physics Hong Kong University of Science and Technology Clear Water Bay Hong Kong China Materials Science Division Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA National High Magnetic Field Laboratory Tallahassee Tallahassee FL 32310 USA Physics Department Florida State University Tallahassee FL 32306 USA Stewart Blusson Quantum Matter Institute University of British Columbia Vancouver Vancouver BC V6T 1Z4 Canada Department of Physics & Astronomy University of British Columbia Vancouver Vancouver BC V6T 1Z1 Canada Canadian Institute for Advanced Research Toronto Toronto ON M5G 1M1 Canada Advanced Light Source Lawrence Berkeley National Laboratory Berkeley Berkeley CA 94720 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park CA 94025 USA National Synchrotron Light Source II Brookhaven National Lab Upton NY 11973 USA Department of Physics and Texas Center for Superconductivity University of Houston Houston TX 77204 USA

Kramers degeneracy is one fundamental embodiment of the quantum mechanical nature of particles with half-integer spin under time reversal symmetry. Under the chiral and noncentrosymmetric achiral crystalline symmetries, Kramers degeneracy emerges respectively as topological quasiparticles of Weyl fermions and Kramers nodal lines (KNLs), anchoring the Berry phase-related physics of electrons. However, an experimental demonstration for ideal KNLs well isolated at the Fermi level is lacking. Here, we establish a class of noncentrosymmetric achiral intercalated transition metal dichalcogenide superconductors with large Ising-type spin-orbit coupling, represented by InxTaS2, to host an ideal KNL phase. We provide evidence from angle-resolved photoemission spectroscopy with spin resolution, angle-dependent quantum oscillation measurements, and ab-initio calculations. Our work not only provides a realistic platform for realizing and tuning KNLs in layered materials, but also paves the way for exploring the interplay between KNLs and superconductivity, as well as applications pertaining to spintronics, valleytronics, and nonlinear transport.

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Exciton Localization of High-Quality ZnO/Mg_xZn_1-xO Multiple Quantum Wells on Si (111) with a Y₂O₃ Buffer Layer (vol 1, pg 3829, 2018)

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ACS APPLIED NANO MATERIALS 2018年第10期1卷 5958-5958页

作者： Liu, Wei-Rein Huang, Wei-Lun Wu, Yung-Chi Lai, Liang-Hsun Hsu, Chia-Hung Hsieh, Wen-Feng Chiang, Tsung-Hung Wan, H. W. Hong, M. Kao, J. National Synchrotron Radiation Research Center Hsinchu 30076 Taiwan Program for Science and Technology of Accelerator Light Source National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Photonics College of Electrical and Computer Engineering National Chiao Tung University Hsinchu 30010 Taiwan Department of Materials Science & Engineering National Tsing Hua University Hsinchu 30013 Taiwan Graduate Institute of Applied Physics and Department of Physics National Taiwan University Taipei 10617 Taiwan Department of Physics National Tsing Hua University Hsinchu 30013 Taiwan

We report the structural and optical properties of ten-period ZnO/MgxZn1–xO multiple quantum wells (MQWs) prepared on the most widely used semiconductor material, Si. The introduction of a nanometer thick high-k Y2O3transition layer between Si (111) substrate and a ZnO buffer layer significantly improves the structural perfection of the MQWs grown on top of it. The high structural quality of the ZnO/MgxZn1–xO MQWs is evidenced by the appearance of pronounced high order satellite peaks in X-ray crystal truncation rods; high resolution cross-sectional transmission electron microscopy images also confirmed the regularly arranged well and barrier layers. When the well width is less than ∼2.7 nm, the quantum-confined Stark effect in MQWs can be negligible. Not only the increasing exciton-binding energy but also reducing exciton–phonon coupling determined in temperature-dependent photoluminescence spectra indicate quantum-size effect. Our results demonstrate that ZnO/MgxZn1–xO MQWs integrated on Si have great potential in UV optoelectronic device applications.

关键词： Excitons Phonons Oxides Binding energy Layers

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