Article
Physics, Multidisciplinary
Jiacheng Zhu, Tingxin Li, Andrea F. Young, Jie Shan, Kin Fai Mak
Summary: This study demonstrates a mechanism for magnetoresistance oscillations in insulating states of 2D materials, showing that the oscillations are correlated with the high-density Fermi surface and due to the oscillatory behavior of graphite density of states. This unified mechanism for quantum oscillations in graphite-gated 2D insulators is based on electrostatic sample-gate coupling.
PHYSICAL REVIEW LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Yiling Yu, Guoqing Li, Yan Xu, Chong Hu, Xiaoze Liu, Linyou Cao
Summary: Quantum liquids, such as Bose-Einstein condensates and superconductors, have been a vibrant area of research in modern physics and engineering. However, these quantum liquids are typically only stable at very low temperatures, which limits their practical applications. In this study, we demonstrate the existence of a stable electron-hole liquid at temperatures as high as 700 K in monolayer MoS2. We also develop a thermodynamic model and an exciton phase diagram to understand the gas-liquid transition in this high-temperature electron-hole liquid.
Article
Multidisciplinary Sciences
Tingxin Li, Shengwei Jiang, Bowen Shen, Yang Zhang, Lizhong Li, Zui Tao, Trithep Devakul, Kenji Watanabe, Takashi Taniguchi, Liang Fu, Jie Shan, Kin Fai Mak
Summary: This study reveals the observation of quantum anomalous Hall effect in AB-stacked MoTe2/WSe2 moire heterobilayers, which exhibits unique band topology characteristics. At half band filling, quantized Hall resistance and vanishing longitudinal resistance are observed, indicating a topological phase transition induced by an out-of-plane electric field.
Article
Optics
Seth T. Rittenhouse, P. Giannakeas, Nirav P. Mehta
Summary: This study investigates the two-body scattering of particles in a one-dimensional periodic potential and utilizes a convenient ansatz to separate center-of-mass and relative motion, resulting in a discrete Schrodinger equation resembling a tight-binding model. By defining distinct scattering lengths and discussing collision resonances, the research reveals the interaction between different bands and collision resonances in the excited band.
Article
Multidisciplinary Sciences
Xi Wang, Chengxin Xiao, Heonjoon Park, Jiayi Zhu, Chong Wang, Takashi Taniguchi, Kenji Watanabe, Jiaqiang Yan, Di Xiao, Daniel R. Gamelin, Wang Yao, Xiaodong Xu
Summary: Many-body interactions between carriers play a crucial role in correlated physics. This study demonstrates the ability to highly tune spin-spin interactions between moire-trapped carriers using optical excitation, resulting in ferromagnetic order in WS2/WSe2 moire superlattices. The observed phenomenon adds a dynamic tuning knob to the rich many-body Hamiltonian of moire quantum matter.
Article
Nanoscience & Nanotechnology
Zui Tao, Bowen Shen, Wenjin Zhao, Nai Chao Hu, Tingxin Li, Shengwei Jiang, Lizhong Li, Kenji Watanabe, Takashi Taniguchi, Allan H. MacDonald, Jie Shan, Kin Fai Mak
Summary: A giant intrinsic spin Hall effect coexisting with ferromagnetism has been observed in AB-stacked MoTe2/WSe2 moire hetero-bilayers. This finding demonstrates the potential of moire engineering for spintronics applications, as it enables long-range spin Hall transport.
NATURE NANOTECHNOLOGY
(2023)
Article
Physics, Multidisciplinary
Camille Lagoin, Stephan Suffit, Kirk Baldwin, Loren Pfeiffer, Francois Dubin
Summary: In this research, the existence of a Mott phase was observed by exploring the Bose-Hubbard model with semiconductor excitons confined in a two-dimensional lattice. This provides a potential pathway for studying many-body phases that break lattice symmetry.
Article
Chemistry, Physical
Chenhao Jin, Zui Tao, Tingxin Li, Yang Xu, Yanhao Tang, Jiacheng Zhu, Song Liu, Kenji Watanabe, Takashi Taniguchi, James C. Hone, Liang Fu, Jie Shan, Kin Fai Mak
Summary: Stripe phases were identified in WSe2/WS2 moire superlattices using optical anisotropy and electronic compressibility measurements, with a distinctive 1/2 state assigned to an insulating stripe crystal phase. The study demonstrates that two-dimensional semiconductor moire superlattices are a versatile platform for studying stripe phases and their interactions with other symmetry breaking ground states.
Article
Physics, Multidisciplinary
Jiawei Zang, Jie Wang, Jennifer Cano, Antoine Georges, Andrew J. Millis
Summary: In this study, a comprehensive analysis of the triangular lattice moire??Hubbard model was conducted to investigate the physics of moire?? bilayer transition metal dichalcogenides. The results reveal the correlation between the band structure and important properties such as resistivity, magnetic order, and metal-insulator transition. The findings provide insights into the behavior of correlated states in twisted homobilayer WSe2 and heterobilayer MoTe2/WSe2 experiments.
Article
Physics, Multidisciplinary
A. Sherman
Summary: In this study, the extended Hubbard model on a two-dimensional square lattice at half-filling is investigated using the strong coupling diagram technique. The first-order phase transition in the charge subsystem is found to occur at v = v(c) greater than or similar to U/4. The transition is characterized by an abrupt sign change in the zero-frequency charge susceptibility at the corner of the Brillouin zone. The alternating deviations of electron occupations from the mean value on neighboring sites have short-range order due to fluctuations.
Article
Materials Science, Multidisciplinary
Umesh Kumar, Abhishek Nag, Jiemin Li, H. C. Robarts, A. C. Walters, Mirian Garcia-Fernandez, R. Saint-Martin, A. Revcolevschi, Justine Schlappa, Thorsten Schmitt, Steven Johnston, Ke-Jin Zhou
Summary: Resonant inelastic x-ray scattering (RIXS) is a tool for investigating spin dynamics in strongly correlated materials. Four-spinon excitations were observed in the study of a related material, offering possibilities for studying nonlocal spin correlations in quantum magnets.
Article
Physics, Multidisciplinary
Igor N. Karnaukhov
Summary: In this study, the topological Mott transition in a two-band model of spinless fermions on a square lattice at half filling was investigated by considering the combined effect of the on-site Coulomb repulsion and the spin-orbit Rashba coupling. The ground state phase diagram was calculated, revealing a distinct phase of matter called the topological semimetal resulting from the spin-orbit Rashba coupling. A new type of phase transition between the non-topological insulator and topological semimetal states was studied.
Article
Multidisciplinary Sciences
R. Mondaini, S. Tarat, R. T. Scalettar
Summary: The sign problem is a fundamental limitation in simulations of strongly correlated matter. In this study, the quantitive connection between the sign problem in determinant quantum Monte Carlo (QMC) and quantum critical behavior is demonstrated through simulations of several well-understood models. A reinterpretation of the low average sign in the Hubbard model is proposed, relating it to the onset of pseudogap behavior and exotic superconductivity.
Article
Chemistry, Physical
Quanzhen Zhang, Zeping Huang, Yanhui Hou, Peiwen Yuan, Ziqiang Xu, Han Yang, Xuan Song, Yaoyao Chen, Huixia Yang, Teng Zhang, Liwei Liu, Hong-Jun Gao, Yeliang Wang
Summary: In this study, we investigated the adsorption and arrangement differences of molecular superlattices on 2H-NbSe2 and 1T-NbSe2 crystals under distinct CDW patterns. We found a perfect geometric commensurability between the molecular superlattice and intrinsic CDW pattern in 2H-NbSe2, while a poor commensurability in 1T-NbSe2. This subtly different geometric commensurability dominates the different adsorption and arrangement of the molecular superlattices on 2D CDW patterns.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2021)
Article
Nanoscience & Nanotechnology
Aidan J. Campbell, Mauro Brotons-Gisbert, Hyeonjun Baek, Valerio Vitale, Takashi Taniguchi, Kenji Watanabe, Johannes Lischner, Brian D. Gerardot
Summary: This study investigates the behavior of exciton-polarons in strongly correlated electronic states and reveals the rich potential of the MoSe2/WSe2 platform.
NPJ 2D MATERIALS AND APPLICATIONS
(2022)
Correction
Multidisciplinary Sciences
Xiaoyu Deng, Katharina M. Stadler, Kristjan Haule, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar
NATURE COMMUNICATIONS
(2020)
Article
Materials Science, Multidisciplinary
Nathan C. Harms, Heung-Sik Kim, Amanda J. Clune, Kevin A. Smith, Kenneth R. O'Neal, Amanda Haglund, David G. Mandrus, Zhenxian Liu, Kristjan Haule, David Vanderbilt, Janice L. Musfeldt
NPJ QUANTUM MATERIALS
(2020)
Letter
Multidisciplinary Sciences
Xiaoyu Deng, Katharina M. Stadler, Kristjan Haule, Seung-Sup B. Lee, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar
NATURE COMMUNICATIONS
(2021)
Article
Materials Science, Multidisciplinary
Qianheng Du, Lijun Wu, Huibo Cao, Chang-Jong Kang, Christie Nelson, Gheorghe Lucian Pascut, Tiglet Besara, Theo Siegrist, Kristjan Haule, Gabriel Kotliar, Igor Zaliznyak, Yimei Zhu, Cedomir Petrovic
Summary: The study identified atomic defects and nanoprecipitate clusters in iron diantimonide that control the thermoelectric power magnitude and thermal conductivity. The connection between atomic defect anisotropy and colossal thermopower in FeSb2 provides insights for understanding and tailoring giant thermopower in related materials.
NPJ QUANTUM MATERIALS
(2021)
Article
Materials Science, Multidisciplinary
Sabine N. Neal, Kenneth R. O'Neal, Amanda Haglund, David G. Mandrus, Hans A. Bechtel, G. Lawrence Carr, Kristjan Haule, David Vanderbilt, Heung-Sik Kim, Janice L. Musfeldt
Summary: Using synchrotron-based near-field infrared spectroscopy and lattice dynamics calculations, the vibrational response of CrPS4 in different thicknesses was investigated. The mode pattern showed a specific space group characteristic with no symmetry crossover as a function of layer number, and non-monotonic frequency shifts were observed. In contrast to MnPS3, CrPS4's vibrational response is sensitive to interlayer motion and displacement patterns.
Article
Multidisciplinary Sciences
Caitlin Walsh, Maxime Charlebois, Patrick Semon, Giovanni Sordi, Andre-Marie S. Tremblay
Summary: The study in a doped Mott insulator using the two-dimensional Hubbard model reveals that the local entropy can detect the superconducting state, with the difference in local entropy between superconducting and normal states following the potential energy difference. The thermodynamic entropy is suppressed in the superconducting state and decreases monotonically with decreasing doping levels, while total mutual information, quantifying quantum and classical correlations, is amplified in the superconducting state of the doped Mott insulator for all doping levels showing a broad peak versus doping due to competing quantum and classical effects.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2021)
Review
Chemistry, Physical
J. D. Denlinger, J-S Kang, L. Dudy, J. W. Allen, Kyoo Kim, J-H Shim, K. Haule, J. L. Sarrao, N. P. Butch, M. B. Maple
Summary: The study investigates the relationship between narrow-band states and bulk Fermi surface topology in URu2Si2 using ARPES mapping of the electronic structure. It reveals the interaction between these states and other band states, and provides insight into the properties and temperature evolution of high symmetry points and nested Fermi-edge states, supporting the understanding of the hidden order transition.
ELECTRONIC STRUCTURE
(2022)
Article
Materials Science, Multidisciplinary
K. Park, M. O. Yokosuk, M. Goryca, J. J. Yang, S. A. Crooker, S-W Cheong, K. Haule, D. Vanderbilt, H-S Kim, J. L. Musfeldt
Summary: In this study, by combining magneto-optical spectroscopy and first-principles calculations, we reveal the nonreciprocity and formation mechanism of Ni3TeO6 in the toroidal geometry. Additionally, we demonstrate the deterministic control of nonreciprocal directional dichroism in Ni3TeO6. These findings are of great significance for the development of photonics applications that utilize the unique symmetry characteristics of materials.
NPJ QUANTUM MATERIALS
(2022)
Article
Chemistry, Physical
Subhasish Mandal, Kristjan Haule, Karin M. Rabe, David Vanderbilt
Summary: Systematic investigation using first principles calculations reveals that the computed bandwidths of nearly free-electron metals can be well described by the local approximation to the self-energy, providing a good agreement with angle-resolved photoemission experiments.
NPJ COMPUTATIONAL MATERIALS
(2022)
Correction
Multidisciplinary Sciences
Xiaoyu Deng, Katharina M. M. Stadler, Kristjan Haule, Seung-Sup B. Lee, Andreas Weichselbaum, Jan von Delft, Gabriel Kotliar
NATURE COMMUNICATIONS
(2023)
Article
Materials Science, Multidisciplinary
C. Walsh, M. Charlebois, P. Semon, G. Sordi, A-M S. Tremblay
Summary: We predict the presence of sound anomalies in the normal state of hole-doped cuprates at the doping 8p, where the pseudogap ends. These anomalies, characterized by sharp dips in the velocity of sound, are suggestive of supercritical phenomena and provide insights into the nature of the pseudogap.
Article
Quantum Science & Technology
C. Walsh, P. Semon, D. Poulin, G. Sordi, A-M S. Tremblay
Article
Materials Science, Multidisciplinary
Rebecca L. Dally, William D. Ratcliff, Lunyong Zhang, Heung-Sik Kim, Markus Bleuel, J. W. Kim, Kristjan Haule, David Vanderbilt, Sang-Wook Cheong, Jeffrey W. Lynn
Article
Materials Science, Multidisciplinary
Michael O. Yokosuk, Heung-Sik Kim, Kendall D. Hughey, Jaewook Kim, Andreas Stier, Kenneth R. O'Neal, Junjie Yang, Scott A. Crooker, Kristjan Haule, Sang-Wook Cheong, David Vanderbilt, Janice L. Musfeldt
NPJ QUANTUM MATERIALS
(2020)
Article
Materials Science, Multidisciplinary
Sungkyun Choi, Heung-Sik Kim, Hun-Ho Kim, Aleksandra Krajewska, Gideok Kim, Matteo Minola, Tomohiro Takayama, Hidenori Takagi, Kristjan Haule, David Vanderbilt, Bernhard Keimer