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Giant Second-Order Nonlinear Hall Effect in Twisted Bilayer Graphene

Physical Review Letters 2022年第18期129卷 186801-186801页

作者： Junxi Duan Yu Jian Yang Gao Huimin Peng Jinrui Zhong Qi Feng Jinhai Mao Yugui Yao Key Laboratory of Advanced Optoelectronic Quantum Architecture and Measurement (MOE) School of Physics Beijing Institute of Technology Beijing 100086 China Department of Physics University of Science and Technology of China Hefei Anhui 230026 China School of Physical Sciences and CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing 100049 China

In the second-order response regime, the Hall voltage can be nonzero without time-reversal symmetry breaking but inversion symmetry breaking. Multiple mechanisms contribute to the nonlinear Hall effect. The disorder-related contributions can enter the NLHE in the leading role, but experimental investigations are scarce, especially the exploration of the contributions from different disorder sources. Here, we report a giant nonlinear response in twisted bilayer graphene, dominated by disorder-induced skew scattering. The magnitude and direction of the second-order nonlinearity can be effectively tuned by the gate voltage. A peak value of the second-order Hall conductivity reaching 8.76 μm SV−1 is observed close to the full filling of the moiré band, four order larger than the intrinsic contribution detected in WTe2. The scaling shows that the giant second-order nonlinear Hall effect in twisted bilayer graphene stems from the collaboration of the static (impurities) and dynamic (phonons) disorders. It is mainly determined by the impurity skew scattering at 1.7 K. The phonon skew scattering, however, has a much larger coupling coefficient, and becomes comparable to the impurity contribution as the temperature rises. Our observations provide a comprehensive experimental understanding of the disorder-related mechanisms in the nonlinear Hall effect.

关键词： Hall effect Transport phenomena Twisted bilayer graphene Hall bar

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Switching between singular points and exceptional-point-enhanced sensing in non-Hermitian photonic structures 13

Switching between singular points and exceptional-point-enha...

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Active Photonic Platforms XIII 2021

作者： Veronis, Georgios Huang, Yin Wang, Lanyan Shen, Yuecheng School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Department of Optoelectrics Information Science and Engineering School of Physics and Electronics Central South University Hunan Changsha410012 China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangdong Guangzhou510275 China

ISBN: (纸本)9781510644304

We investigate the exceptional points in a two-layer cylindrical waveguide structure consisting of absorbing and nonabsorbing dielectrics. We show that by tuning the parameters of the structure the complex effective indices of two waveguide modes can coalesce so that an exceptional point is formed. We show that the sensitivity of the effective index of the waveguide mode is enhanced at the exceptional point. We also investigate using phase-change materials in multilayer structures to switch between singular points. We show that in multilayer structures consisting of phasechange, lossless dielectric, lossy, and gain materials, absorbing or spectral singularities can be switched to exceptional points, and self-dual spectral singularities can be switched to unidirectional spectral singularities by switching the phasechange material from its crystalline to its amorphous phase. Our results could be important for developing new compact reconfigurable singularity-enhanced optical devices. © 2021 SPIE.

关键词： Physical optics

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Topological Edge States at Singular Points in Non-Hermitian Plasmonic Waveguide-Cavity Systems

Topological Edge States at Singular Points in Non-Hermitian ...

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CLEO: science and Innovations, S and I 2022

作者： Huang, Yin Shen, Yuecheng Veronis, Georgios Department of Optoelectrics Information Science and Engineering School of Physics and Electronics Central South University Hunan Changsha410012 China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangdong Guangzhou510275 China School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States

We show that non-Hermitian plasmonic waveguide-cavity systems can simultaneously exhibit both topological edge states and singular points. We also show that the sensitivity of the reflected light intensity is greatly ... 详细信息

ISBN: (纸本)9781557528209

关键词： Topology

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General room-temperature Suzuki-Miyaura polymerization for organic electronics (Jan, 10.1038/s41563-023-01794-9, 2024)

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NATURE MATERIALS 2024年第3期23卷 439-439页

作者： Xiong, Haigen Lin, Qijie Lu, Yu Zheng, Ding Li, Yawen Wang, Song Xie, Wenbin Li, Congqi Zhang, Xin Lin, Yuze Wang, Zhi-Xiang Shi, Qinqin Marks, Tobin J. Huang, Hui College of Materials Science and Opto-Electronic Technology University of Chinese Academy of Sciences Beijing People’s Republic of China Center of Materials Science and Optoelectronics Engineering University of Chinese Academy of Sciences Beijing People’s Republic of China School of Chemical Sciences University of Chinese Academy of Sciences Beijing People’s Republic of China Department of Chemistry and the Materials Research Center Northwestern University Evanston IL USA Beijing National Laboratory for Molecular Sciences CAS Key Laboratory of Organic Solids Institute of Chemistry Chinese Academy of Sciences Beijing People’s Republic of China CAS Center for Excellence in Topological Quantum Computation University of Chinese Academy of Sciences Beijing People’s Republic of China CAS Key Laboratory of Vacuum Physics University of Chinese Academy of Sciences Beijing People’s Republic of China

π-Conjugated polymers (CPs) have broad applications in high-performance optoelectronics, energy storage, sensors and biomedicine. However, developing green and efficient methods to precisely synthesize alternating CP structures on a large scale remains challenging and critical for their industrialization. Here a room-temperature, scalable and homogeneous Suzuki–Miyaura-type polymerization reaction is developed with broad generality validated for 24 CPs including donor–donor, donor–acceptor and acceptor–acceptor connectivities, yielding device-quality polymers with high molecular masses. Furthermore, the polymerization protocol significantly reduces homocoupling structural defects, yielding more structurally regular and higher-performance electronic materials and optoelectronic devices than conventional thermally activated polymerizations. Experimental and theoretical studies reveal that a borate transmetalation process plays a key role in suppressing protodeboronation, which is critical for large-scale structural regularity. Thus, these results provide a general polymerization tool for the scalable production of device-quality CPs with alternating structural regularity.

关键词： Electronic devices Materials for optics

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Spectral broadening of a single Er3+ ion in a Si nano-transistor

arXiv

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arXiv 2022年

作者： Yang, Jiliang Wang, Jian Fan, Wenda Zhang, Yangbo Duan, Changkui Hu, Guangchong de Boo, Gabriele G. Johnson, Brett C. McCallum, Jeffrey C. Rogge, Sven Yin, Chunming Du, Jiangfeng CAS Key Laboratory of Microscale Magnetic Resonance School of Physical Sciences University of Science and Technology of China Hefei230026 China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of China Hefei230026 China Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of New South Wales NSW2052 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Engineering RMIT University VIC3001 Australia Centre of Excellence for Quantum Computation and Communication Technology School of Physics University of Melbourne VIC3010 Australia

Single rare-earth ions in solids show great potential for quantum applications, including single photon emission, quantum computing, and high-precision sensing. However, homogeneous linewidths observed for single rare-earth ions are orders of magnitude larger than the sub-kilohertz linewidths observed for ensembles in bulk crystals. The spectral broadening creates a significant challenge for achieving entanglement generation and qubit operation with single rare-earth ions, so it is critical to investigate the broadening mechanisms. We report a spectral broadening study on a single Er3+ ion in a Si nano-transistor. The Er-induced photoionisation rate is found to be an appropriate quantity to represent the optical transition probability for spectroscopic studies, and the single ion spectra display a Lorentzian lineshape at all optical powers in use. Spectral broadening is observed at relatively high optical powers and is caused by spectral diffusion on a fast time scale. Copyright © 2022, The Authors. All rights reserved.

关键词： Metal ions

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Switching between topological edge states using phase-change materials

Switching between topological edge states using phase-change...

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2023 Active Photonic Platforms, APP 2023

作者： Veronis, Georgios Huang, Yin Shen, Yuecheng School of Electrical Engineering and Computer Science Louisiana State University Baton RougeLA70803 United States Center for Computation and Technology Louisiana State University Baton RougeLA70803 United States Department of Optoelectrics Information Science and Engineering School of Physics and Electronics Central South University Hunan Changsha410012 China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information Technology Sun Yat-Sen University Guangdong Guangzhou510275 China

ISBN: (纸本)9781510665088

We introduce non-Hermitian plasmonic waveguide-cavity structures based on the Aubry-Andre-Harper model to realize switching between right and left topological edge states using the phase-change material germanium-antimony-tellurium (GST). The structure unit cells consist of a metal-dielectric-metal (MDM) waveguide side-coupled to MDM stub resonators with modulated distances between adjacent stubs. In such structures the modulated distances introduce an effective gauge magnetic field. We show that switching between the crystalline and amorphous phases of GST leads to a shift of the dispersion relation of the optimized structure so that a right topological edge state for the crystalline phase, and a left topological edge state for the amorphous phase occur at the same frequency. Thus, we realize switching between right and left topological edge states at that frequency by switching between the crystalline and amorphous phases of GST. Our results could be potentially important for developing compact reconfigurable topological photonic devices. © 2023 SPIE.

关键词： Gages

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Topological edge states at singular points in non-Hermitian plasmonic systems

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Photonics Research 2022年第3期10卷 747-757页

作者： Yin Huang Yuecheng Shen Georgios Veronis Department of Optoelectrics Information Science and Engineering School of Physics and ElectronicsCentral South UniversityChangsha 410012China State Key Laboratory of Optoelectronic Materials and Technologies School of Electronics and Information TechnologySun Yat-sen UniversityGuangzhou 510275China School of Electrical Engineering and Computer Science Louisiana State UniversityBaton RougeLouisiana 70803USA Center for Computation and Technology Louisiana State UniversityBaton RougeLouisiana 70803USA

We introduce non-Hermitian plasmonic waveguide-cavity systems with topological edge states(TESs)at singular *** compound unit cells of the structures consist of metal-dielectric-metal(MDM)stub resonators side-coupled to an MDM *** show that we can realize both a TES and an exceptional point at the same frequency when a proper amount of loss is introduced into a finite three-unit-cell *** also show that the finite structure can exhibit both a TES and a spectral singularity when a proper amount of gain is introduced into the *** addition,we show that we can simultaneously realize a unidirectional spectral singularity and a TES when proper amounts of loss and gain are introduced into the *** finally show that this singularity leads to extremely high sensitivity of the reflected light intensity to variations of the refractive index of the active materials in the *** at singular points could potentially contribute to the development of singularity-based plasmonic devices with enhanced performance.

关键词： structure singularity singular

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High-resolution spectroscopy of individual erbium ions in strong magnetic fields

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Physical Review B 2020年第15期102卷 155309-155309页

作者： Gabriele G. de Boo Chunming Yin Miloš Rančić Brett C. Johnson Jeffrey C. McCallum Matthew J. Sellars Sven Rogge Centre for Quantum Computation and Communication Technologies UNSW Sydney Australia CAS Key Laboratory of Microscale Magnetic Resonance and Department of Modern Physics University of Science and Technology of China Hefei 230026 China Centre for Quantum Computation and Communication Technologies The Australian National University Australia Quantronics Group Service de Physique de l'Etat Condens CEA Saclay France Centre for Quantum Computation and Communication Technologies University of Melbourne Australia

In this paper, we use electrically detected optical excitation spectroscopy of individual erbium ions in silicon to determine their optical and paramagnetic properties simultaneously. We demonstrate that this high spectral resolution technique can be exploited to observe interactions typically unresolvable in silicon using conventional spectroscopy techniques due to inhomogeneous broadening. In particular, we resolve the Zeeman splitting of the I15/24 ground and I13/24 excited state separately, and in strong magnetic fields, we observe the anticrossings between Zeeman components of different crystal-field levels. We discuss the use of this electronic detection technique to aid in the identification of the symmetry and structure of erbium sites in silicon.

关键词： Zeeman effect Doped semiconductors Rare-earth doped crystals Crystal-field theory Optical absorption spectroscopy

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Pion and kaon form factors using twisted-mass fermions 38

Pion and kaon form factors using twisted-mass fermions

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38th International Symposium on Lattice Field Theory, LATTICE 2021

作者： Alexandrou, Constantia Bacchio, Simone Cloët, Ian Constantinou, Martha Delmar, Joseph Hadjiyiannakou, Kyriakos Koutsou, Giannis Lauer, Colin Avilés-Casco, Alejandro Vaquero Department of Physics University of Cyprus P.O. Box 20537 Nicosia1678 Cyprus Computation-Based Science and Technology Research Center The Cyprus Institute 20 Kavafi Str. Nicosia2121 Cyprus Physics Division Argonne National Laboratory LemontIL60439 United States Department of Physics Temple University 1925 N. 12th Street PhiladelphiaPA19122-1801 United States Department of Physics and Astronomy University of Utah Salt Lake CityUT84112 United States

We present a calculation of the scalar, vector and tensor pion and kaon form factors using one ensemble of two degenerate light, a strange and a charm quark (Nf=2+1+1) of maximally twisted mass fermions with clover improvement. The quark masses are chosen so that they produce a pion mass of about 265 MeV, and a kaon mass of 530 MeV. The lattice spacing of the ensemble is 0.093 fm and the lattice has a spatial extent of 3 fm. We use a rest frame, as well as a boosted frame to obtain the form factors for a wider and denser set of four-vector momentum transfer squared, Q2. To assess and eliminate excited-states contamination, we analyze several values of the source-sink time separation within the range of 1.12 2.23 fm (1.12 - 1.67 fm) for the rest (bosted) frame. The Q2 dependence of the form factors is parametrized using a monopole fit, which leads to the extraction of the corresponding radius, and the tensor anomalous magnetic moment for the tensor form factor. The results for these parametrizations are compared for the pion and kaon to assess the level of the SU(3) flavor symmetry breaking. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0)

关键词： Tensors

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General form of genuine multipartite entanglement quantum channels for teleportation

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Physical Review A 2006年第3期74卷 032324-032324页

作者： Ping-Xing Chen Shi-Yao Zhu Guang-Can Guo Department of Physics Hong Kong Baptist University Kowloon Tong Hong Kong China Key Laboratory of Quantum Communication and Quantum Computation University of Science and Technology of China Hefei 230026 People’s Republic of China Department of Physics National University of Defense Technology Changsha 410073 People’s Republic of China Institute of Theoretical Physics Chinese University of Hong Kong Hong Kong

Recently Yeo and Chua [Phys. Rev. Lett. 96, 060502 (2006)] presented an explicit protocol for faithfully teleporting an arbitrary two-qubit state via a genuine four-qubit entanglement channel. Here we generalize completely their results to teleporting an arbitrary N-qubit state via genuine N-qubit entanglement channels. And we present the general form of the genuine multipartite entanglement channels, namely, the sufficient and necessary condition the genuine N-qubit entanglement channels must satisfy to teleport an arbitrary N-qubit state.

关键词： Quantum theory

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