Article
Multidisciplinary Sciences
Rui Wang, Tigran A. Sedrakyan, Baigeng Wang, Lingjie Du, Rui-Rui Du
Summary: Correlation and frustration are important in physics, leading to new quantum phases. In this study, we observe the moat-band phenomena in shallowly inverted InAs/GaSb quantum wells, where we find an unconventional time-reversal-symmetry breaking excitonic ground state. We demonstrate the evolution from helical-like to chiral-like edge transport and explain our experimental observations using a moat band for excitons that results from density imbalance.
Article
Chemistry, Physical
Zhiwei Liu, Hongquan Liu, Jiaji Ma, Xiaoxuan Wang, Gang Li, Hanghui Chen
Summary: We provide design principles for inducing multiple topological states in oxide superlattices and show the existence of a strong topological insulator and multiple coexisting topological Dirac semi-metal states in a specific oxide superlattice.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Chemistry, Physical
Aiyun Luo, Zhida Song, Gang Xu
Summary: By using first-principles calculations and magnetic topological quantum chemistry, this study reveals the presence of fragile topological electronic states in the antiferromagnetic monolayer FeSe, which is very close to an antiferromagnetic topological insulator with robust edge states. These fragile topological states are captured by a double-degenerate nearly flat band just below the Fermi level. The S-4z symmetry is found to protect this fragile topology, leading to a 2D second-order topological insulator that supports a bound state with fractional charge e/2 at the corner of the sample. This work provides an important platform for studying the intriguing properties of magnetic fragile topological electronic states and can explain previous observations in the checkerboard antiferromagnetic monolayer FeSe.
NPJ COMPUTATIONAL MATERIALS
(2022)
Article
Materials Science, Multidisciplinary
Yingyi Huang
Summary: We study the emergence of topological Floquet flat bands in alternating-twist multilayer graphene near the first magic angle. By applying a circularly polarized laser beam, a gap can be opened at the Moire K point, creating Floquet flat bands with non-zero Chern numbers. These dynamically produced topological flat bands can potentially be observed in experiments and offer a feasible way to realize the fractional Chern insulator.
Review
Physics, Applied
Changhua Bao, Peizhe Tang, Dong Sun, Shuyun Zhou
Summary: The interaction between light and 2D and topological materials serves as a fascinating control knob for inducing emergent properties and achieving new functionalities in ultrafast timescales, from femtoseconds to picoseconds. Recent experimental progress on light-induced phenomena, such as Bloch-Floquet states and photo-induced phase transitions, has been discussed, with perspectives on the opportunities of proposed light-induced phenomena and open experimental challenges also provided.
NATURE REVIEWS PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Guan-Hao Feng, Hong-Hao Zhang, Zhongbo Yan
Summary: This study demonstrates that various topological insulating phases can be found in bilayer Dirac materials, and intrinsic odd-parity superconductivity can arise in these systems through doping and short-range attractive interactions. The number and positions of Fermi surfaces result in different topological superconducting phases.
Article
Materials Science, Multidisciplinary
Zhiyong Yu, Wenqiao Han, Zengji Yue, Boyuan Cai, Zhengfen Wan, Hua Lu, Khay See, Zhenxiang Cheng, Min Gu, Songbai Hu
Summary: This study demonstrated the photo-electrochemical properties of a typical topological insulator material, Sb2Te3 thin film. The Sb2Te3 thin films were grown on a glass substrate using atomic layer deposition and characterized using various techniques. The as-fabricated Sb2Te3 thin films showed continuous and coarse surfaces with high crystallization, and exhibited potential for photocatalytic water splitting application.
Article
Materials Science, Multidisciplinary
Kazuaki Takasan, Shuntaro Sumita, Youichi Yanase
Summary: We demonstrate that finite current can induce topological phase transitions in superconductors by deforming the quasiparticle spectrum through the finite center-of-mass momentum of Cooper pairs. We examine the topological properties of three prototypical systems and show that all models exhibit current-induced topological phase transitions. We discuss the possibility of observing these phase transitions in experiments and their relation to other pairing states with finite center-of-mass momentum.
Article
Multidisciplinary Sciences
Martin Claassen, Lede Xian, Dante M. Kennes, Angel Rubio
Summary: The study predicts that twisted bilayers of ZrS2 with the group-IV metal Zr can form an emergent moire Kagome lattice with strong spin-orbit coupling, leading to novel topological quantum phases dominated by strong spin-orbit interactions. At small twist angles, ZrS2 heterostructures give rise to an emergent and twist-controlled moire Kagome lattice, combining geometric frustration and strong spin-orbit coupling to realize a moire quantum spin Hall insulator with highly controllable and nearly-dispersionless bands.
NATURE COMMUNICATIONS
(2022)
Article
Multidisciplinary Sciences
Yan-Cheng Wang, Meng Cheng, William Witczak-Krempa, Zi Yang Meng
Summary: The experimental discovery of Anyons in two-dimensional electron gases has opened up new possibilities for studying quantum particles beyond bosons and fermions. Large-scale quantum Monte Carlo simulations have revealed unique conductivity properties near a phase transition, with implications for quantum materials research.
NATURE COMMUNICATIONS
(2021)
Article
Multidisciplinary Sciences
Mingwen Zhang, Nannan Han, Jiachen Zhang, Jing Wang, Xiaoqing Chen, Jianlin Zhao, Xuetao Gan
Summary: In this study, the vdW stacking of bilayer MoS2 (2LM) and monolayer graphene (1LG) is found to exhibit remarkable second-harmonic generation (SHG), which is attributed to interlayer charge transfer and imbalanced charge distribution in 2LM. The strength of SHG from 2LM/1LG is comparable to that of monolayer MoS2 with strong second-order nonlinearity. This emerging SHG phenomenon reveals the ability of interlayer charge transfer to modify the symmetry and nonlinear optical properties of 2D heterostructures, and indicates the potential of SHG spectroscopy for characterizing interlayer coupling in vdW heterostructures.
Article
Materials Science, Multidisciplinary
Debarati Pal, Bharat B. Sharma, Vinod K. Gangwar, Sambhab Dan, Mahima Singh, Nandini Garg, Swapnil Patil, Sandip Chatterjee
Summary: The study presents experiments of angle dispersive X-Ray diffraction (ADXRD) on Sb1.9Fe0.1S0.15Te2.85, revealing an electronic topological transition (ETT) and three pressure-induced structural phase transitions. The c/a anomaly serves as a signature of ETT at -2.5 GPa.
Article
Chemistry, Multidisciplinary
Fei Meng, Zhi-Kang Lin, Weibai Li, Peiguang Yan, Yun Zheng, Xinping Li, Jian-Hua Jiang, Baohua Jia, Xiaodong Huang
Summary: This study demonstrates the discovery of 2D surface states described by spin-1 Dirac equations at the interfaces between two sonic crystals with distinct topology but the same crystalline symmetry. The Dirac mass of these surface states can be tuned by the geometry of the crystals. The study also confirms the existence of zero refractive index behavior and emergent topological hinge states.
Article
Chemistry, Physical
Hongwei Xue, Wenxing Lv, Di Wu, Jialin Cai, Zhihao Ji, Yu Zhang, Zhongming Zeng, Qingyuan Jin, Zongzhi Zhang
Summary: This study investigates the temperature-dependent spin-orbit torque efficiencies in topological insulators, showing a significant enhancement at lower temperatures due to improved spin-polarized surface states. The findings provide insights into spin transport mechanisms and robust charge-spin conversion in TIs.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Materials Science, Multidisciplinary
P. P. Ferreira, A. L. R. Manesco, T. T. Dorini, L. E. Correa, G. Weber, A. J. S. Machado, L. T. F. Eleno
Summary: The study reveals the controllability of electronic and elastic properties in Dirac semimetal NiTe2 through strain, and proposes a method of controlling the electronic structure by intercalating alkali species into the van der Waals gap.
Article
Physics, Multidisciplinary
David Pekker, Bryan K. Clark, Vadim Oganesyan, Gil Refael
PHYSICAL REVIEW LETTERS
(2017)
Article
Physics, Multidisciplinary
Javier M. Magan, Simone Paganelli, Vadim Oganesyan
Correction
Chemistry, Physical
Lukas Zhao, Haiming Deng, Inna Korzhovska, Zhiyi Chen, Marcin Konczykowski, Andrzej Hruban, Vadim Oganesyan, Lia Krusin-Elbaum
Article
Physics, Multidisciplinary
Tankut Can, Vadim Oganesyan, Dror Orgad, Sarang Gopalakrishnan
PHYSICAL REVIEW LETTERS
(2019)
Article
Quantum Science & Technology
Eliot Kapit, Vadim Oganesyan
Summary: Quantum annealing is a powerful alternative model of quantum computing, and the new variant RFQA maintains a scalable quantum speedup in the presence of noise and modest control precision. Research shows that RFQA is resilient to certain noise channels and can be implemented experimentally with current technology.
QUANTUM SCIENCE AND TECHNOLOGY
(2021)
Article
Physics, Multidisciplinary
Sankhya Basu, Daniel P. Arovas, Sarang Gopalakrishnan, Chris A. Hooley, Vadim Oganesyan
Summary: We present a quantum circuit with measurements and postselection that exhibits a variety of space- and/or time-ordered phases from ferromagnetic order to spin-density waves to time crystals. The incommensurate time-crystal phase of our circuit can be tuned by adjusting the circuit parameters.
PHYSICAL REVIEW RESEARCH
(2022)
Article
Materials Science, Multidisciplinary
Matthew Stern, Claudio Castelnovo, Roderich Moessner, Vadim Oganesyan, Sarang Gopalakrishnan
Summary: This study investigates the response of quantum spin ice in a specific temperature range, finding that the propagation of monopoles can be transformed into quantum diffusion, with the results being robust and consistent with experimental observations.
Article
Optics
F. Barratt, Aleix Bou Comas, P. Crowley, V Oganesyan, P. Sollich, A. G. Green
Summary: This article discusses how dephasing affects entanglement resources in adiabatic quantum transport and analyzes the failure of adiabatic computation as a dynamical phase transition.
Article
Materials Science, Multidisciplinary
Aaron Hui, Samuel Lederer, Vadim Oganesyan, Eun-Ah Kim
Article
Materials Science, Multidisciplinary
V. K. Varma, A. Raj, S. Gopalakrishnan, V Oganesyan, D. Pekker
Article
Materials Science, Multidisciplinary
Kartiek Agarwal, Richard Schmidt, Bertrand Halperin, Vadim Oganesyan, Gergely Zarand, Mikhail D. Lukin, Eugene Demler
Article
Materials Science, Multidisciplinary
S. Vayl, A. B. Kuklov, V. Oganesyan
Article
Materials Science, Multidisciplinary
Yoni Schattner, Vadim Oganesyan, Dror Orgad
Article
Materials Science, Multidisciplinary
R. J. Sanchez, V. K. Varma, V. Oganesyan