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Identification of a characteristic doping for charge order phenomena in Bi-2212 cuprates via RIXS

Physical Review B 2022年第15期106卷 155109-155109页

作者： Haiyu Lu Makoto Hashimoto Su-Di Chen Shigeyuki Ishida Dongjoon Song Hiroshi Eisaki Abhishek Nag Mirian Garcia-Fernandez Riccardo Arpaia Giacomo Ghiringhelli Lucio Braicovich Jan Zaanen Brian Moritz Kurt Kummer Nicholas B. Brookes Ke-Jin Zhou Zhi-Xun Shen Thomas P. Devereaux Wei-Sheng Lee Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Physics Stanford University Stanford California 94305 USA Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo Park California 94025 USA Department of Applied Physics Stanford University Stanford California 94305 USA National Institute of Advanced Industrial Science and Technology Tsukuba Ibaraki 305-8568 Japan Diamond Light Source Harwell Campus Didcot OX11 0DE United Kingdom Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 I-20133 Milano Italy Department of Microtechnology and Nanoscience Chalmers University of Technology SE-41296 Göteborg Sweden CNR-SPIN Dipartimento di Fisica Politecnico di Milano Piazza Leonardo da Vinci 32 I-20133 Milano Italy European Synchrotron Radiation Facility (ESRF) B.P. 220 F-38043 Grenoble Cedex France Instituut-Lorentz for Theoretical Physics Leiden University Niels Bohrweg 2 2333 CA Leiden The Netherlands Geballe Laboratory for Advanced Materials Stanford University Stanford California 94305 USA Department of Materials Science and Engineering Stanford University Stanford California 94305 USA

Identifying quantum critical points (QCPs) and their associated fluctuations may hold the key to unraveling the unusual electronic phenomena observed in cuprate superconductors. Recently, signatures of quantum fluctuations associated with charge order (CO) have been inferred from the anomalous enhancement of CO excitations that accompany the reduction of the CO order parameter in the superconducting state. To gain more insight into the interplay between CO and superconductivity, here we investigate the doping dependence of this phenomenon throughout the Bi-2212 cuprate phase diagram using resonant inelastic x-ray scattering (RIXS) at the Cu L3 edge. As doping increases, the CO wave vector decreases, saturating near a commensurate value of 0.25 reciprocal lattice unit beyond a characteristic doping pc, where the correlation length becomes shorter than the apparent periodicity (4a0). Such behavior is indicative of the fluctuating nature of the CO; the proliferation of CO excitations in the superconducting state also appears strongest at pc, consistent with expected behavior at a CO QCP. Intriguingly, pc appears to be near optimal doping, where the superconducting transition temperature Tc is maximal.

关键词： Charge order Superconductivity Cuprates Strongly correlated systems Resonant inelastic x-ray scattering

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Observation of a novel lattice instability in ultrafast photoexcited SnSe

arXiv

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arXiv 2021年

作者： Huang, Yijing Yang, Shan Teitelbaum, Samuel De La Peña, Gilberto Sato, Takahiro Chollet, Matthieu Zhu, Diling Niedziela, Jennifer L. Bansal, Dipanshu May, Andrew F. Lindenberg, Aaron M. Delaire, Olivier Reis, David A. Trigo, Mariano Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Applied Physics Stanford University StanfordCA94305 United States PULSE Institute of Ultrafast Energy Science SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Department of Mechanical Engineering and Materials Science Duke University DurhamNC27708 United States Linac Coherent Light Source SLAC National Accelerator Laboratory Menlo ParkCA94025 United States Materials Science and Technology Division Oak Ridge National Laboratory Oak RidgeTN37831 United States Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Department of Physics Duke University DurhamNC27708 United States Department of Chemistry Duke University DurhamNC27708 United States Department of Photon Science Stanford University StanfordCA94305 United States

There is growing interest in using ultrafast light pulses to drive functional materials into nonequilibrium states with novel properties. The conventional wisdom is that above gap photoexcitation behaves similarly to raising the electronic temperature and lacks the desired selectivity in the final state. Here we report a novel nonthermal lattice instability induced by ultrafast above-gap excitation in SnSe, a representative of the IV-VI class of semiconductors that provides a rich platform for tuning material functionality with ultrafast pulses due to their multiple lattice instabilities. The new lattice instability is accompanied by a drastic softening of the lowest frequency Ag phonon. This mode has previously been identified as the soft mode in the thermally driven phase transition to a Cmcm structure. However, by a quantitative reconstruction of the atomic displacements from time-resolved x-ray diffraction for multiple Bragg peaks and excitation densities, we show that ultrafast photoexcitation with near-infrared (1.55 eV) light, induces a distortion towards a different structure with Immm symmetry. The Immm structure of SnSe is an orthorhombic distortion of the rocksalt structure and does not occur in equilibrium. Density functional theory (DFT) calculations reveal that the photoinduced Immm lattice instability arises from electron excitation from the Se 4p- and Sn 5s-derived bands deep below the Fermi level that cannot be excited thermally. The results have implications for optical control of the thermoelectric, ferroelectric and topological properties of the monochalcogenides and related materials. More generally, the results emphasize the need for ultrafast structural probes to reveal distinct atomic-scale dynamics that are otherwise too subtle or invisible in conventional spectroscopies. © 2021, CC BY-NC-ND.

关键词： Tin compounds

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

arXiv

引用

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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Tuning the Band Topology of GdSb by Epitaxial Strain

arXiv

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arXiv 2022年

作者： Inbar, Hadass S. Ho, Dai Q. Chatterjee, Shouvik Engel, Aaron N. Khalid, Shoaib Dempsey, Connor P. Pendharkar, Mihir Chang, Yu Hao Nishihaya, Shinichi Fedorov, Alexei V. Lu, Donghui Hashimoto, Makoto Read, Dan Janotti, Anderson Palmstrøm, Christopher J. Materials Department University of California Santa Barbara Santa BarbaraCA93106 United States Department of Materials Science and Engineering University of Delaware NewarkDE19716 United States Faculty of Natural Sciences Quy Nhon University Quy Nhon59000 Viet Nam Electrical and Computer Engineering Department University of California Santa Barbara Santa BarbaraCA93106 United States Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Stanford Synchrotron Radiation Lightsource SLAC National Accelerator Laboratory CA United States School of Physics and Astronomy Cardiff University CardiffCF24 3AA United Kingdom Department of Physics School of Natural Sciences National University of Science and Technology Islamabad44000 Pakistan Department of Materials Science and Engineering Stanford University StanfordCA94305 United States Department of Physics Tokyo Institute of Technology Tokyo152-8551 Japan

Rare-earth monopnictide (RE-V) semimetal crystals subjected to hydrostatic pressure have shown interesting trends in magnetoresistance, magnetic ordering, and superconductivity, with theory predicting pressure-induced band inversion. Yet, thus far, there have been no direct experimental reports of interchanged band order in RE-Vs due to strain. This work studies the evolution of band topology in biaxially strained GdSb (001) epitaxial films using angle-resolved photoemission spectroscopy (ARPES) and density functional theory (DFT). We find that biaxial strain continuously tunes the electronic structure from topologically trivial to nontrivial, reducing the gap between the hole and the electron bands dispersing along the [001] direction. The conduction and valence band shifts seen in DFT and ARPES measurements are explained by a tight-binding model that accounts for the orbital symmetry of each band. Finally, we discuss the effect of biaxial strain on carrier compensation and magnetic ordering temperature. Copyright © 2022, The Authors. All rights reserved.

关键词： Density functional theory

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Evidences for the exciton gas phase and its condensation in monolayer 1T-ZrTe2

arXiv

引用

arXiv 2022年

作者： Song, Yekai Jia, Chunjing Xiong, Hongyu Wang, Binbin Jiang, Zhicheng Huang, Kui Hwang, Jinwoong Li, Zhuojun Hwang, Choongyu Liu, Zhongkai Shen, Dawei Sobota, Jonathan A. Kirchmann, Patrick Xue, Jiamin Devereaux, Thomas P. Mo, Sung-Kwan Shen, Zhi-Xun Tang, Shujie State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China 2020 X-Lab Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory 2575 Sand Hill Road Menlo ParkCA94025 United States Geballe Laboratory for Advanced Materials Departments of Physics and Applied Physics Stanford University StanfordCA94305 United States Key Laboratory for Power Machinery and Engineering of MOE School of Mechanical Engineering Shanghai Jiao Tong University Shanghai200240 China School of Physical Science and Technology ShanghaiTech University Shanghai201210 China Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics Pusan National University Busan46241 Korea Republic of

The excitonic insulator (EI) is a Bose-Einstein condensation (BEC) of excitons bound by electron-hole interaction in a solid, which could support high-temperature BEC transition1-3. The material realization of EI has been elusive, which is further challenged by the difficulty of distinguishing it from a conventional charge density wave (CDW) state. In the BEC limit, the precondensation exciton gas phase4 is a hallmark to distinguish EI from conventional CDW, yet direct experimental evidence has been lacking5. Here we report a distinct correlated phase beyond the 2×2 CDW ground state emerging in epitaxially grown monolayer 1T-ZrTe2 and its investigation by angle-resolved photoemission spectroscopy (ARPES) and scanning tunneling microscopy (STM). The results show novel band- and energy-dependent folding behavior in a two-step process, evidenced by an exciton gas phase prior to its condensation into the final CDW state. The excellent agreement between experiments and theoretical predictions on the recovery of the pristine band structure by carrier-density-dependent suppression of the CDW state further corroborates the monolayer 1T-ZrTe2 as an EI. Our findings provide a versatile two-dimensional platform that allows tuning of the excitonic effect. Copyright © 2022, The Authors. All rights reserved.

关键词： Bose-Einstein condensation

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

arXiv

引用

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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Structure and properties of Ba9Fe3S15 with quasi-one-dimensional spin chains

引用

Physical Review B 2025年第22期111卷 224405-224405页

作者： Jun Zhang Yating Jia Xiaoming Chen Baosen Min Takashi Honda Zhiwei Hu Liu Hao Tjeng Shin-ichi Shamoto Jianfa Zhao Zheng Deng Jing Song Lei Duan Manuel Valvidares Jinlong Zhu Xiancheng Wang Changqing Jin Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Sciences Beijing 100190 China School of Physics University of Chinese Academy of Sciences Beijing 100190 China Quantum Science Center of Guangdong–Hong Kong–Macao Greater Bay Area (Guangdong) Shenzhen 518045 China School of Materials Science and Engineering Henan University of Technology Zhengzhou 450007 China Institute of Materials Structure Science High Energy Accelerator Research Organization (KEK) Tsukuba Ibaraki 305-0801 Japan Max Plank Institute for Chemical Physics of Solids Nöthnitzer Straβe 40 D-01187 Dresden Germany Neutron Science and Technology Center Comprehensive Research Organization for Science and Society (CROSS) Tokai 319-1106 Japan ALBA Synchrotron Light Source E-08290 Cerdanyola del Vallès Barcelona Spain Department of Physics Southern University of Science and Technology Shenzhen 518055 China

In this work, the properties of Ba9Fe3S15 have been studied via magnetism, electrical transport, and specific heat measurements. The crystal structure mainly consists of face-sharing octahedral FeS6 chains with an interchain distance of 9.2320 Å, demonstrating a strongly quasi-one-dimensional (1D) character. Ba9Fe3S15 is a semiconductor with a band gap of 562 meV and its electrical transport property is dominated by p electrons. The semiconducting behavior is kept under the highest pressure up to 62 GPa. The long-range spin order (LRSO) transition has been observed with TC∼8.8 K. The neutron diffraction experiments provide evidence that Ba9Fe3S15 hosts ferrimagnetic spin chains with the spins parallel to (110) and the spin assignment of Fe2↑Fe1↓Fe2↑. T0.5 dependence on the magnetic contribution to the specific heat has been observed above TC, indicating the natural property of the 1D ferrimagnetic spin chain. In addition, the magnetic susceptibility deviates from the Curie-Weiss law far above TC, and the LRSO transition only causes a small kink in the specific heat curve; these imply that short-range spin orders have formed above TC because of the strong intrachain spin coupling. Also, it is revealed that the ordered moment is reduced by over 40% in Ba9Fe3S15, which is indicative of the spin partially ordered state below TC and implies the existence of strong quantum fluctuation in the reduced dimension system. Ba9Fe3S15 should be a unique example to further study the intrinsic properties of an ideal ferrimagnetic spin chain.

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Designer three-dimensional electronic bands in asymmetric transition metal dichalcogenide heterostructures

arXiv

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arXiv 2025年

作者： Clark, Oliver J. Azhar, Anugrah Chambers, Ben A. McEwen, Daniel Vu, Thi-Hai-Yen Bhuiyan, Tofajjol M.H. Belosludov, Rodion V. Bostwick, Aaron Jozwiak, Chris Rotenberg, Eli Lee, Seng Huat Mao, Zhiqiang Balakrishnan, Geetha Mazzola, Federico Harmer, Sarah L. Fuhrer, Michael S. Bahramy, M. Saeed Edmonds, Mark T. School of Physics and Astronomy Monash University ClaytonVIC Australia Department of Physics and Astronomy University of Manchester Oxford Road ManchesterM13 9PY United Kingdom Physics Study Program Faculty of Science and Technology Syarif Hidayatullah State Islamic University Tangerang Selatan Jakarta15412 Indonesia Flinders Microscopy and Microanalysis Flinders University Bedford ParkSA5042 Australia ARC Centre for Future Low Energy Electronics Technologies Monash University ClaytonVIC Australia Institute for Materials Research Tohoku University Sendai980-8577 Japan Advanced Light Source Lawrence Berkeley National Laboratory BerkeleyCA94720 United States Department of Physics Pennsylvania State University University ParkPA16802 United States 2D Crystal Consortium Materials Research Institute Pennsylvania State University University ParkPA16802 United States Department of Physics University of Warwick CoventryCV4 7AL United Kingdom Department of Molecular Sciences and Nanosystems Ca Foscari University of Venice VeniceIT-30172 Italy CNR-SPIN UOS Napoli Complesso Universitario di Monte Sant’Angelo Via Cinthia Napoli80126 Italy Institute for Nanoscale Science and Technology Flinders University Bedford ParkSA5042 Australia ANFF-VIC Technology Fellow Melbourne Centre for Nanofabrication Victorian Node of the Australian National Fabrication Facility ClaytonVIC3168 Australia

Van der Waals materials enable the construction of atomically sharp interfaces between compounds with distinct crystal and electronic properties [1]. This is dramatically exploited in moiré systems, where a lattice mismatch or twist between monolayers generates an emergent in-plane periodicity, giving rise to electronic properties absent in the constituent materials [2, 3]. In contrast, vertical superlattices—formed by stacking dissimilar van der Waals materials in the out-of-plane direction on the nanometer scale—remain largely unexplored, despite their potential to realize analogous emergent phenomena in three dimensions [4]. Here, we employ angle-resolved photoemission spectroscopy and density functional theory to investigate six-to-eight layer transition metal dichalcogenide (TMD) heterostructures. We find that even a single superlattice unit, i.e. a pair of stacked few-layer materials, exhibits emergent bands that closely resemble the hallmark three-dimensional electronic structure of many-layer TMDs, while simultaneously exhibiting an orbital- and momentum-dependent delocalization through the entire heterostructure due to its asymmetric architecture. We demonstrate how non-trivial band topology and unique TMD fermiologies are readily stabilized through these mechanisms, thus providing direct evidence for the novel electronic states possible through vertical superlattice engineering. These findings establish asymmetric heterostructures as platforms to invoke and control unprecedented combinations of the diverse quantum phases native to many-layer TMDs. Copyright © 2025, The Authors. All rights reserved.

关键词： Van der Waals forces

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Origin of Plasticity in Nanostructured Silicon

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Physical Review Letters 2020年第18期124卷 185701-185701页

作者： Zhidan Zeng Qiaoshi Zeng Mingyuan Ge Bin Chen Hongbo Lou Xiehang Chen Jinyuan Yan Wenge Yang Ho-kwang Mao Deren Yang Wendy L. Mao Center for High Pressure Science and Technology Advanced Research Pudong Shanghai 201203 People’s Republic of China Jiangsu Key Laboratory of Advanced Metallic Materials School of Materials Science and Engineering Southeast University Nanjing 211189 People’s Republic of China National Synchrotron Light Source II (NSLS-II) Brookhaven National Laboratory Upton New York 11973 USA Advanced Light Source Lawrence Berkeley National Laboratory Berkeley California 94720 USA State Key Lab of Silicon Materials and School of Materials Science and Engineering Zhejiang University Hangzhou 310027 People’s Republic of China Department of Geological Sciences Stanford University Stanford California 94305 USA Stanford Institute for Materials and Energy Sciences SLAC National Accelerator Laboratory Menlo Park California 94025 USA

The mechanism of plasticity in nanostructured Si has been intensively studied over the past decade but still remains elusive. Here, we used in situ high-pressure radial x-ray diffraction to simultaneously monitor the deformation and structural evolution of a large number of randomly oriented Si nanoparticles (SiNPs). In contrast to the high-pressure β-Sn phase dominated plasticity observed in large SiNPs (∼100 nm), small SiNPs (∼9 nm) display a high-pressure simple hexagonal phase dominated plasticity. Meanwhile, dislocation activity exists in all of the phases, but significantly weakens as the particle size decreases and only leads to subtle plasticity in the initial diamond cubic phase. Furthermore, texture simulations identify major active slip systems in all of the phases. These findings elucidate the origin of plasticity in nanostructured Si under stress and provide key guidance for the application of nanostructured Si.

关键词： Plastic deformation Plasticity Solid-solid transformations

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Author Correction: Ultrafast X-ray imaging of the light-induced phase transition in VO2

引用

Nature Physics 2023年 297页

作者： Allan S. Johnson Daniel Perez-Salinas Khalid M. Siddiqui Klara Volckaert Paulina E. Majchrzak Søren Ulstrup Naman Agarwal Simon E. Wall Sungwon Kim Sungwook Choi Hyunjung Kim Kent Hallman Richard F. Haglund Jr Christian M. Günther Bastian Pfau Stefan Eisebitt Dirk Backes Francesco Maccherozzi Ann Fitzpatrick Sarnjeet S. Dhesi Pierluigi Gargiani Manuel Valvidares Nongnuch Artrith Frank de Groot Hyeongi Choi Dogeun Jang Abhishek Katoch Soonnam Kwon Sang Han Park ICFO-Institut de Ciències Fotòniques The Barcelona Institute of Science and Technology Barcelona Spain Department of Physics and Astronomy Aarhus University Aarhus Denmark Department of Physics Sogang University Seoul Korea Department of Physics and Astronomy Vanderbilt University Nashville TN USA Zentraleinrichtung Elektronenmikroskopie (ZELMI) Technische Universität Berlin Berlin Germany Max-Born-Institut Berlin Germany Institut für Optik und Atomare Physik Technische Universität Berlin Berlin Germany Diamond Light Source Didcot UK ALBA Synchrotron Light Source Barcelona Spain Materials Chemistry and Catalysis Utrecht University Utrecht Netherlands Pohang Accelerator Laboratory Pohang Korea

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