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arXiv 2021年

作者： Afach, Samer Buchler, Ben C. Budker, Dmitry Dailey, Conner Derevianko, Andrei Dumont, Vincent Figueroa, Nataniel L. Gerhardt, Ilja Grujić, Zoran D. Guo, Hong Hao, Chuanpeng Hamilton, Paul S. Hedges, Morgan Jackson Kimball, Derek F. Kim, Dongok Khamis, Sami Kornack, Thomas Lebedev, Victor Lu, Zheng-Tian Masia-Roig, Hector Monroy, Madeline Padniuk, Mikhail Palm, Christopher A. Park, Sun Yool Paul, Karun V. Penaflor, Alexander Peng, Xiang Pospelov, Maxim Preston, Rayshaun Pustelny, Szymon Scholtes, Theo Segura, Perrin C. Semertzidis, Yannis K. Sheng, Dong Shin, Yun Chang Smiga, Joseph A. Stalnaker, Jason E. Sulai, Ibrahim Tandon, Dhruv Wang, Tao Weis, Antoine Wickenbrock, Arne Wilson, Tatum Wu, Teng Wurm, David Xiao, Wei Yang, Yucheng Yu, Dongrui Zhang, Jianwei Helmholtz-Institut Mainz GSI Helmholtzzentrum für Schwerionenforschung Darmstadt64291 Germany Johannes Gutenberg-Universität Mainz Mainz55128 Germany Centre for Quantum Computation and Communication Technology Research School of Physics The Australian National University Acton2601 Australia Department of Physics University of California at Berkeley BerkeleyCA94720-7300 United States Department of Physics University of Nevada RenoNV89557 United States Computational Research Division Lawrence Berkeley National Laboratory BerkeleyCA94720 United States 3rd Institute of Physics Max Planck Institute for Solid State Research StuttgartD-70569 Germany Institute of Physic Belgrade University of Belgrade Belgrade11080 Serbia Physics Department University of Fribourg Chemin du Musée 3 FribourgCH-1700 Switzerland State Key Laboratory of Advanced Optical Communication Systems and Networks Department of Electronics Center for Quantum Information Technology Peking University Beijing100871 China Department of Precision Machinery and Precision Instrumentation University of Science and Technology of China Hefei230026 China Department of Physics and Astronomy University of California Los AngelesCA90095 United States Department of Physics California State University – East Bay HaywardCA94542-3084 United States Center for Axion and Precision Physics Research IBS Daejeon34051 Korea Republic of Department of Physics KAIST Daejeon34141 Korea Republic of Twinleaf LLC 300 Deer Creek Drive PlainsboroNJ08536 United States Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of China Hefei230026 China Institute of Physics Jagiellonian University in Krakow prof. Stanislawa Lojasiewicza 11 Kraków30-348 Poland Department of Physics and Astronomy Oberlin College OberlinOH44074 United States School of Physics and Astronomy University of Minnesota MinneapolisMN55455 United States William I. Fine Theoretic

Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can form stable, macroscopic field configurations in the form of topological defects that could concentrate the dark matter density into many distinct, compact spatial regions that are small compared to the galaxy but much larger than the Earth. Here, we report the results of a search for transient signals from axion-like particle domain walls with the Global Network of Optical Magnetometers for Exotic physics searches (GNOME). We search the data, consisting of correlated measurements from optical atomic magnetometers located in laboratories all over the world, for patterns of signals propagating through the network consistent with domain walls. The analysis of data from a continuous month-long operation of the GNOME finds no statistically significant signals, thus placing experimental constraints on such dark matter scenarios. Copyright © 2021, The Authors. All rights reserved.

关键词： Galaxies

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Decoupling cross-quadrature correlations using passive operations

引用

Physical Review A 2020年第2期102卷 022615-022615页

作者： Syed M. Assad Mile Gu Xiaoying Li Ping Koy Lam Nanyang Quantum Hub School of Physical and Mathematical Sciences Nanyang Technological University Singapore 639673 Republic of Singapore Centre for Quantum Computation and Communication Technology Department of Quantum Science Research School of Physics and Engineering Australian National University Canberra ACT 2601 Australia Centre for Quantum Technologies National University of Singapore 3 Science Drive 2 Singapore Republic of Singapore Complexity Institute Nanyang Technological University Singapore 639673 Republic of Singapore College of Precision Instrument and Opto-Electronics Engineering Key Laboratory of Opto-Electronics Information Technology Ministry of Education Tianjin University Tianjin 300072 China

Quadrature correlations between subsystems of a Gaussian quantum state are fully characterized by its covariance matrix. For example, the covariance matrix determines the amount of entanglement or decoherence of the state. Here, we establish when it is possible to remove correlations between conjugate quadratures using only passive operations. Such correlations are usually undesired and arise due to experimental cross-quadrature contamination. Using the Autonne-Takagi factorization, we present necessary and sufficient conditions to determine when such removal is possible. Our proof is constructive, and whenever it is possible we obtain an explicit expression for the required passive operation.

关键词： Quantum information processing with continuous variables

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Room Temperature Anhydrous Suzuki–Miyaura Polymerization Enabled by C−S Bond Activation

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Angewandte Chemie 2023年第40期135卷

作者： Xuan Wen Wenbin Xie Yawen Li Xiaoying Ma Zhaoying Liu Xiao Han Kaikai Wen Prof. Fengjiao Zhang Prof. Yuze Lin Prof. Qinqin Shi Prof. Aidong Peng Prof. Hui Huang College of Materials Science and Opto-Electronic Technology & Center of Materials Science and Optoelectronics Engineering & CAS Center for Excellence in Topological Quantum Computation & CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing 100049 P. R. China School of Chemical Sciences University of Chinese Academy of Sciences Beijing 100049 P. R. China Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing 100190 P. R. China Department of Dermatology the Fifth Affiliated Hospital Sun Yat-sen University Zhuhai 519000 P. R. China

The Suzuki–Miyaura cross-coupling is one of the most important and powerful methods for constructing C−C bonds. However, the protodeboronation of arylboronic acids hinder the development of Suzuki–Miyaura coupling in the precise synthesis of conjugated polymers (CPs). Here, an anhydrous room temperature Suzuki–Miyaura cross-coupling reaction between (hetero)aryl boronic esters and aryl sulfides was explored, of which universality was exemplified by thirty small molecules and twelve CPs. Meanwhile, the mechanistic studies involving with capturing four coordinated borate intermediate revealed the direct transmetalation of boronic esters in the absence of H 2 O suppressing the protodeboronation. Additionally, the room temperature reaction significantly reduced the homocoupling defects and enhanced the optoelectronic properties of the CPs. In all, this work provides a green protocol to synthesize alternating CPs.

关键词： C−S Bond Activation Conjugated Polymers Protodeboronation Room-Temperature Reactions Suzuki–Miyaura Cross-Coupling

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Ultrafast coherent control of a hole spin qubit in a germanium quantum dot

arXiv

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arXiv 2020年

作者： Wang, Ke Xu, Gang Gao, Fei Liu, He Ma, Rong-Long Zhang, Xin Wang, Zhanning Cao, Gang Wang, Ting Zhang, Jian-Jun Culcer, Dimitrie Hu, Xuedong Jiang, Hong-Wen Li, Hai-Ou Guo, Guang-Can Guo, Guo-Ping CAS Key Laboratory of Quantum Information University of Science and Technology of China Anhui Hefei230026 China CAS Center for Excellence Synergetic Innovation Center in Quantum Information and Quantum Physics University of Science and Technology of China Anhui Hefei230026 China Institute of Physics and CAS Center for Excellence in Topological Quantum Computation Chinese Academy of Sciences Beijing100190 China School of Physics University of New South Wales Sydney2052 Australia Department of Physics University at Buffalo SUNY BuffaloNY14260 United States Department of Physics and Astronomy University of California Los AngelesCA90095 United States Origin Quantum Computing Company Limited Anhui Hefei230026 China

Operation speed and coherence time are two core measures for the viability of a qubit. Strong spin-orbit interaction (SOI) and relatively weak hyperfine interaction make holes in germanium (Ge) intriguing candidates for spin qubits with rapid, all-electrical coherent control. Here we report ultrafast single-spin manipulation in a hole-based double quantum dot in a germanium hut wire (GHW). Mediated by the strong SOI, a Rabi frequency exceeding 540 MHz is observed at a magnetic field of 100 mT, setting a record for ultrafast spin qubit control in semiconductor systems. We demonstrate that the strong SOI of heavy holes (HHs) in our GHW, characterized by a very short spin-orbit length of 1.5 nm, enables the rapid gate operations we accomplish. Our results demonstrate the potential of ultrafast coherent control of hole spin qubits to meet the requirement of DiVincenzo’s criteria for a scalable quantum information processor. Copyright © 2020, The Authors. All rights reserved.

关键词： Germanium

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Eightfold fermionic excitation in a charge density wave compound

arXiv

引用

arXiv 2020年

作者： Zhang, Xi Gu, Qiangqiang Sun, Haigen Luo, Tianchuang Liu, Yanzhao Chen, Yueyuan Shao, Zhibin Zhang, Zongyuan Li, Shaojian Sun, Yuanwei Li, Yuehui Li, Xiaokang Xue, Shangjie Ge, Jun Xing, Ying Comin, R. Zhu, Zengwei Gao, Peng Yan, Binghai Feng, Ji Pan, Minghu Wang, Jian International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China School of Physics Huazhong University of Science and Technology Wuhan430074 China Electron Microscopy Laboratory School of Physics Peking University Beijing100871 China Wuhan National High Magnetic Field Center Huazhong University of Science and Technology Wuhan430074 China Department of Physics Massachusetts Institute of Technology Cambridge02139 Massachusetts United States Department of Materials Science and Engineering School of New Energy and Materials China University of Petroleum Beijing102249 China Beijing Academy of Quantum Information Sciences Beijing100193 China Department of Condensed Matter Physics Weizmann Institute of Science Rehovot7610001 Israel CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

Unconventional quasiparticle excitations in condensed matter systems have become one of the most important research frontiers. Beyond two- and fourfold degenerate Weyl and Dirac fermions, three-, six- and eightfold symmetry protected degeneracies have been predicted however remain challenging to realize in solid state materials. Here, charge density wave compound TaTe4 is proposed to hold eightfold fermionic excitation and Dirac point in energy bands. High quality TaTe4 single crystals are prepared, where the charge density wave is revealed by directly imaging the atomic structure and a pseudogap of about 45 meV on the surface. Shubnikov de-Haas oscillations of TaTe4 are consistent with band structure calculation. Scanning tunneling microscopy reveals atomic step edge states on the surface of TaTe4. This work uncovers that charge density wave is able to induce new topological phases and sheds new light on the novel excitations in condensed matter materials. Copyright © 2020, The Authors. All rights reserved.

关键词： Charge density waves

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Parton distribution functions of Δ+ on the lattice

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Physical Review D 2020年第1期102卷 014508-014508页

作者： Yahui Chai Yuan Li Shicheng Xia Constantia Alexandrou Krzysztof Cichy Martha Constantinou Xu Feng Kyriakos Hadjiyiannakou Karl Jansen Giannis Koutsou Chuan Liu Aurora Scapellato Fernanda Steffens School of Physics Peking University Beijing 100871 China Department of Physics University of Cyprus P.O. Box 20537 1678 Nicosia Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia 2121 Cyprus Faculty of Physics Adam Mickiewicz University ul. Uniwersytetu Poznańskiego 2 61-614 Poznań Poland Temple University 1925 N. 12th Street Philadelphia Pennsylvania 19122-1801 USA Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking University Beijing 100871 China State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Computation-based Science and Technology Research Center The Cyprus Institute 20 Kavafi Street Nicosia 2121 Cyprus NIC DESY Platanenallee 6 D-15738 Zeuthen Germany Institut für Strahlen- und Kernphysik Rheinische Friedrich-Wilhelms-Universität Bonn Nussallee 14-16 53115 Bonn Germany

We perform a first calculation for the unpolarized parton distribution function of the Δ+ baryon using lattice QCD simulations within the framework of large momentum effective theory. Two ensembles of Nf=2+1+1 twisted mass fermions are utilized with a pion mass of 270 and 360 MeV, respectively. The baryon, which is treated as a stable single-particle state, is boosted with momentum P3 with values {0.42,0.83,1.25} GeV, and we utilize momentum smearing to improve the signal. The unpolarized parton distribution function of Δ+ is obtained using a nonperturbative renormalization and a one-loop formula for the matching, with encouraging precision. In particular, we compute the d¯(x)−u¯(x) asymmetry and compare it with the same quantity in the nucleon, in a first attempt towards resolving the physical mechanism responsible for generating such asymmetry.

关键词： Lattice QCD

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Topological phase transitions of Thouless charge pumping realized in helical organic molecules with long-range hoppings

arXiv

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arXiv 2020年

作者： Guo, Ai-Min Hu, Pei-Jia Gao, Xiao-Hui Fang, Tie-Feng Sun, Qing-Feng Hunan Key Laboratory for Super-microstructure and Ultrafast Process School of Physics and Electronics Central South University Changsha410083 China Key Laboratory for Magnetism and Magnetic Materials of MOE School of Physical Science and Technology Lanzhou University Lanzhou730000 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Collaborative Innovation Center of Quantum Matter Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

Recent studies indicated that helical organic molecules, such as DNA and α-helical protein, can behave as Thouless quantum pumps when a rotating electric field is applied perpendicularly to their helical axes. Here we investigate the influence of long-range hoppings on this topological pumping of electrons in single-helical organic molecules. Under variation of the long-range hoppings governed by a decay exponent µ, we find an energy gap in the molecular band structure closes at a critical value µc of the decay exponent and reopens for µ deviating from µc. The relevant bulk bands in a pumping cycle acquire different Chern numbers in the strong (µ µc) long-range hopping regimes, with a sudden jump at criticality. This topological phase transition is also shown to separate two distinct behaviors of the midgap end states in the pumping process. The end states carry quantized current pumped by the rotating electric field and the current forms a plateau by sweeping the Fermi energy over the gap. In the strong hopping phase, the quantized current plateau is positive, which is reversed to a negative one with smaller amplitude in the weak hopping phase. However, the reversal is a smooth crossover, not a sharp transition, due to the finite sizes of the molecules. We show that these transport characteristics of the topological phase transition could also be observed at finite temperatures. Copyright © 2020, The Authors. All rights reserved.

关键词： Topology

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Quantum oscillation beyond the quantum limit in pseudospin Dirac materials

arXiv

引用

arXiv 2020年

作者： Wang, C.M. Lu, Hai-Zhou Xie, X.C. Department of Physics Shanghai Normal University Shanghai200234 China Institute for Quantum Science and Engineering Department of Physics Southern University of Science and Technology Shenzhen518055 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China Beijing Academy of Quantum Information Sciences West Building 3 No. 10 Xibeiwang East Road Haidian District Beijing100193 China

Recently, many unexpected fine structures in electric, magnetic, and thermoelectric responses at extremely magnetic fields in topological materials have attracted tremendous interest. We propose a new mechanism of quantum oscillation beyond the strong-field quantum limit for Dirac fermions. The amplitude of the oscillation is far larger than the usual Shubnikov–de Haas oscillation. The oscillation tends to be periodic in the magnetic field B, instead of 1/B. The period of the oscillation does not depend on the Fermi energy. These behaviors cannot be described by the famous Lifshitz-Kosevich formula. The oscillation arises from a mechanism that we refer to as the inversion of the lowest Landau level, resulted from the competition between the pseudospin Dirac-type Landau levels and real-spin Zeeman spitting beyond the quantum limit. This inversion gives rise to the oscillation of the Fermi energy and conductivity at extremely large magnetic fields. This mechanism will be useful for understanding the unexpected fine structures observed in the strong-field quantum limit in Dirac materials. Copyright © 2020, The Authors. All rights reserved.

关键词： Magnetic fields

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Theory for the charge-density-wave mechanism of 3D quantum Hall effect

arXiv

引用

arXiv 2020年

作者： Qin, Fang Li, Shuai Du, Z.Z. Wang, C.M. Lu, Hai-Zhou Xie, X.C. Shenzhen518055 China CAS Key Laboratory of Quantum Information University of Science and Technology of China Chinese Academy of Sciences Hefei Anhui230026 China Shenzhen Key Laboratory of Quantum Science and Engineering Shenzhen518055 China Department of Physics Shanghai Normal University Shanghai200234 China International Center for Quantum Materials School of Physics Peking University Beijing100871 China Beijing Academy of Quantum Information Sciences Beijing100193 China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing100190 China

The charge-density-wave (CDW) mechanism of the 3D quantum Hall effect has been observed recently in ZrTe5 [Tang et al., Nature 569, 537 (2019)]. Quite different from previous cases, the CDW forms on a 1D band of Landau levels, which strongly depends on the magnetic field. However, its theory is still lacking. We develop a theory for the CDW mechanism of 3D quantum Hall effect. The theory can capture the main features in the experiments. We find a magnetic field induced second-order phase transition to the CDW phase. We find that electron-phonon interactions, rather than electron-electron interactions, dominate the order parameter. We extract the value of electron-phonon coupling constant from the non-Ohmic I-V relation. We point out a commensurate-incommensurate CDW crossover in the experiment. More importantly, our theory explores a rare case, in which a magnetic field can induce an order-parameter phase transition in one direction but a topological phase transition in other two directions, both depend on one magnetic field. It will be useful and inspire further experiments and theories on this emergent phase of matter. Copyright © 2020, The Authors. All rights reserved.

关键词： Charge density

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The Arpu Kuilpu Meteorite: In-depth characterization of an H5 chondrite delivered from a Jupiter Family Comet orbit

arXiv

引用

arXiv 2024年

作者： Anderson, Seamus L. Benedix, Gretchen K. Godel, Belinda Alosius, Romain M.L. Krietsch, Daniela Busemann, Henner Maden, Colin Friedrich, Jon M. McMonigal, Lara R. Welten, Kees C. Caffee, Marc W. Macke, Robert J. Cadogan, Seán Ryan, Dominic H. Jourdan, Fred Mayers, Celia Laubenstein, Matthias Greenwood, Richard C. Roberts, Malcom P. Devillepoix, Hadrien A.R. Sansom, Eleanor K. Towner, Martin C. Cupák, Martin Bland, Philip A. Forman, Lucy V. Fairweather, John H. Rogers, Ashley F. Timms, Nicholas E. Space Science and Technology Centre School of Earth and Planetary Sciences Curtin University GPO Box U1987 PerthWA Australia Dept. Earth and Planetary Sciences Western Australian Museum Locked Bag 49 WelshpoolWA Australia CSIRO Mineral Resources KensingtonWA Australia Institute of Geochemistry and Petrology ETH Zurich ZurichCH-8092 Switzerland Dept. of Chemistry Fordham University 441 East Fordham Rd. BronxNY10458 United States Dept. of Earth and Planetary Sciences American Museum of Natural History 79th Street at Central Park West New YorkNY10024 United States Space Sciences Laboratory University of California Berkeley 7 Gauss Way BerkeleyCA94720 United States Dept. Physics and Astronomy Purdue University West LafayetteIN47907 United States Dept. of Earth Atmospheric and Planetary Sciences West LafayetteIN47907 United States Vatican Observatory Vatican City-State V-00120 Italy School of Science UNSW Canberra CanberraACTBC2610 Australia Dept. of Physics McGill University 3600 rue University MontréalQC Canada Western Australian Argon Isotope Facility John de Laeter Centre Curtin University GPO Box U1987 PerthWA3845 Australia National Institute of Nuclear Physics National Laboratory at Gran Sasso Via G. Acitelli 22 Assergi L'Aquila67100 Italy PSSRI Open University Milton KeynesMK7 6AA United Kingdom Centre for Microscopy Characterisation and Analysis University of Western Australia 35 Stirling Hwy CrawleyWA6009 Australia International Centre for Radio Astronomy Research Curtin University GPO Box U1987 PerthWA Australia Curtin Institute for Computation Curtin University GPO Box U1987 PerthWA Australia

Over the Nullarbor Plain in South Australia, the Desert Fireball Network detected a fireball on the night of 1 June 2019 (7:30 pm local time), and six weeks later recovered a single meteorite (42 g) named Arpu Kuilpu. This meteorite was then distributed to a consortium of collaborating institutions to be measured and analyzed by a number of methodologies including: SEM-EDS, EPMA, ICP-MS, gamma-ray spectrometry, ideal gas pycnometry, magnetic susceptibility measurement, μCT, optical microscopy, and accelerator and noble gas mass spectrometry techniques. These analyses revealed that Arpu Kuilpu is an unbrecciated H5 ordinary chondrite, with minimal weathering (W0-1) and minimal shock (S2). The olivine and pyroxene mineral compositions (in mol%) are Fa: 19.2 ± 0.2, and Fs: 16.8 ± 0.2, further supporting the H5 type and class. The measured oxygen isotopes are also consistent with an H chondrite (δ17O% = 2.904 ± 0.177;δ18O% = 4.163 ± 0.336;Δ17O% = 0.740 ± 0.002). Ideal gas pycnometry measured bulk and grain densities of 3.66 ± 0.02 and 3.77 ± 0.02 g cm-3, respectively, yielding a porosity of 3.0 % ± 0.7. The magnetic susceptibility of this meteorite is log χ = 5.16 ± 0.08. The most recent impact-related heating event experienced by Arpu Kuilpu was measured by 40Ar/39Ar chronology to be 4467 ± 16 Ma, while the cosmic ray exposure age is estimated to be between 6-8 Ma. The noble gas isotopes, radionuclides, and fireball observations all indicate that Arpu Kuilpu’s meteoroid was quite small (maximum radius of 10 cm, though more likely between 1-5 cm). Although this meteorite is a rather ordinary ordinary chondrite, its prior orbit resembled that of a Jupiter Family Comet (JFC) further lending support to the assertion that many cm- to m-sized objects on JFC orbits are asteroidal rather than cometary in origin. Copyright © 2024, The Authors. All rights reserved.

关键词： Magnetic susceptibility

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