Article
Chemistry, Inorganic & Nuclear
Mallesh Baithi, Ngoc Toan Dang, Tuan Anh Tran, J. Pierce Fix, Dinh Hoa Luong, Krishna P. Dhakal, Duhee Yoon, Anton V. Rutkauskas, Sergei E. Kichanov, Ivan Y. Zel, Jeongyong Kim, Nicholas J. Borys, Denis P. Kozlenko, Young Hee Lee, Dinh Loc Duong
Summary: This article reports a weakly magnetically frustrated two-dimensional (2D) van der Waals material CrPSe3, which exhibits an incommensurate antiferromagnetic order, as revealed by magnetic susceptibility and neutron diffraction measurements. This discovery enriches the physics of 2D magnetic materials and opens up opportunities for their practical applications in spintronics and quantum devices.
INORGANIC CHEMISTRY
(2023)
Article
Physics, Applied
Jianghua Li, Chengwu Xie, Wenhong Wang, Xiao-Ping Li, Gang Zhang, Xiaotian Wang
Summary: In recent years, there has been considerable interest in 2D second-order topological insulators (SOTIs) due to their unique properties. However, only the FeSe monolayer has been reported as a candidate for 2D intrinsic antiferromagnetic SOTIs. In this study, NiRuCl6 is proposed as a candidate for 2D antiferromagnetic SOTIs with corner states strictly at the Fermi level.
APPLIED PHYSICS LETTERS
(2023)
Article
Materials Science, Multidisciplinary
Sander O. Hanslin, Alireza Qaiumzadeh
Summary: The Dzyaloshinskii-Moriya (DM) interaction is crucial in topological spintronics, and can be induced by an ac electric field component of a laser pulse in an antiferromagnetic system with relativistic spin-orbit coupling. These induced DM interactions can be anisotropic and intense polarized laser pulses can generate both bulk-type and interfacial-type DM interactions, even when crystal symmetry would traditionally prevent one type in equilibrium. This reveals rich behaviors in periodically driven spin systems and out of equilibrium magnetic systems.
Article
Materials Science, Multidisciplinary
Lei Zhang, Cheng Tang, Aijun Du
Summary: In this study, the coexistence of 2D antiferromagnetic ferroelasticity and bidirectional auxeticity in vanadium tetrafluoride (VF4) monolayer was reported using first-principles calculations. The material features a wide-gap semiconductor with antiferromagnetic order, moderate reversible strain, and ultra-large negative Poisson's ratio (NPR), making it a versatile candidate for multifunctional devices in nanoelectronics, spintronics, and mechanical applications.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Physics, Applied
RongRong Chen, Shuang Dou, V. S. Stepanyuk, DeSheng Xue, ChengLong Jia, Kun Tao
Summary: In this study, ab initio calculations were used to investigate exchange interactions between topological insulators and antiferromagnetic films. The results show that the magnetic anisotropy and spin direction of heterostructures can be controlled by tuning the stacking modes, with large induced magnetic moments found at the interface.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Physical
Hai L. Feng, Chang-Jong Kang, Pascal Manuel, Fabio Orlandi, Yu Su, Jie Chen, Yoshihiro Tsujimoto, Joke Hadermann, Gabriel Kotliar, Kazunari Yamaura, Emma E. McCabe, Martha Greenblatt
Summary: Pb2NiOsO6 is a metallic and antiferromagnetic oxide that shows a single transition at low temperatures, with three-dimensional connectivity. Neutron powder diffraction and first-principles calculation studies indicate that both Ni and Os moments are ordered below the transition temperature, breaking inversion symmetry. This unusual loss of inversion symmetry in metallic systems makes the 3d-Sd double-perovskite oxides a new class of noncentrosymmetric antiferromagnetic metallic oxides.
CHEMISTRY OF MATERIALS
(2021)
Article
Physics, Multidisciplinary
Wenshan Hong, Lu Liu, Chang Liu, Xiaoyan Ma, Akihiro Koda, Xin Li, Jianming Song, Wenyun Yang, Jinbo Yang, Peng Cheng, Hongxia Zhang, Wei Bao, Xiaobai Ma, Dongfeng Chen, Kai Sun, Wenan Guo, Huiqian Luo, Anders W. Sandvik, Shiliang Li
Summary: In the study of Sr2CuTe1-xWxO6 using neutron diffraction and mu SR techniques, it was found that the Néel order vanishes at x = 0.025 +/- 0.005. A two-dimensional Heisenberg spin model was used to explain the extreme order suppression, where a W-type impurity induces a deformation of the order parameter with a logarithmic singularity leading to loss of order for any x > 0. In the nonmagnetic phase of Sr2CuTe1-xWxO6, the mu SR relaxation rate exhibits quantum critical scaling with a large dynamic exponent, z approximate to 3, consistent with a random-singlet state.
PHYSICAL REVIEW LETTERS
(2021)
Article
Materials Science, Multidisciplinary
Duo Wang, Xin Chen, Biplab Sanyal
Summary: The paper critically examines the magnetic properties of 2D FeS2, revealing it to be in an antiferromagnetic state with spin-phonon coupling that may trigger ferromagnetic coupling via strain. Possibilities of noncollinear magnetic structures are also indicated, with potential for manipulation through directional strain application.
Article
Materials Science, Multidisciplinary
C. Y. Tang, Z. F. Lin, J. X. Zhang, X. C. Guo, J. Y. Guan, S. Y. Gao, Z. C. Rao, J. Zhao, Y. B. Huang, T. Qian, Z. Y. Weng, K. Jin, Y. J. Sun, H. Ding
Summary: Systematic angle-resolved photoemission spectroscopy measurements on T'La2-xCexCuO4+/-delta (LCCO) thin films revealed a variation in electron doping levels, affecting the Fermi surface volume and suppressing antiferromagnetic order in LCCO. This suppression may be attributed to enhanced next-nearest-neighbor hopping in LCCO due to the largest La3+ ionic radius among lanthanide elements.
Article
Physics, Fluids & Plasmas
Jie Ren, Zhao Wang, Weixia Chen, Wen-Long You
Summary: In this study, we investigate quantum phase transitions in Heisenberg antiferromagnetic chains with staggered power-law decaying long-range interactions. By using the density-matrix renormalization group (DMRG) algorithm and the fidelity susceptibility as the criticality measure, we obtain more accurate values of quantum critical points compared to previous studies. Furthermore, we explore the effects of anisotropic long-range interactions and symmetry breaking, which result in the emergence of various quantum phases.
Article
Nanoscience & Nanotechnology
Ning Ding, Kunihiro Yananose, Carlo Rizza, Feng-Ren Fan, Shuai Dong, Alessandro Stroppa
Summary: We studied the magneto-optical Kerr effect (MOKE) in a two-dimensional heterostructure CrI3/In2Se3/CrI3 using density functional theory calculations and symmetry analysis. The mirror and time-reversal symmetries are broken by the spontaneous polarization in the In2Se3 ferroelectric layer and the antiferromagnetic ordering in the CrI3 layers, thereby activating MOKE. Our results demonstrate that the Kerr angle can be reversed by either the polarization or the antiferromagnetic order parameter. This suggests that ferroelectric and antiferromagnetic 2D heterostructures could be utilized for compact information storage devices, with the information encoded by the two ferroelectric or the two time-reversed antiferromagnetic states and read optically via MOKE.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Materials Science, Multidisciplinary
Tushar Sharma, Rishabh Jain, Naushad Ahmad, Mukhtar Ahmed, Seungdae Oh, Sharf Ilahi Siddiqui
Summary: In this paper, the RKKY indirect exchange interactions in a two-dimensional model of Zn1-xMnxO dilute magnetic semiconductor are theoretically studied. The exchange coupling constants for different doped samples are calculated, and the variations in magnetic coupling strength with carrier density are examined.
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T
(2023)
Article
Materials Science, Multidisciplinary
Xinying Li, Ning Mao, Runhan Li, Ying Dai, Baibiao Huang, Chengwang Niu
Summary: In this study, a topological switch between normal insulator and AFM TI in two-dimensional NaMnBi quintuple layers is theoretically demonstrated. Using first-principles calculations, the researchers investigated the structure, stability, magnetism, and electronic properties, showing that the band gap and topology can be effectively tuned. The results not only expand the understanding of magnetic topological states but also propose potential applications in topological AFM spintronics.
JOURNAL OF MATERIALS CHEMISTRY C
(2021)
Article
Chemistry, Inorganic & Nuclear
Zoraida Sandoval-Olivares, Eduardo Solis-Cespedes, Dayan Paez-Hernandez
Summary: The antiferromagnetic coupling supported by metallophilic interactions has been studied using broken symmetry approach and multiconfigurational calculations. The results show that axial ligands with a pure sigma-donor character strengthen the antiferromagnetic coupling. The interaction between magnetic orbitals and low-level excitations in the region of Pt atoms also plays a role in enhancing the antiferromagnetic coupling.
INORGANIC CHEMISTRY
(2022)
Article
Materials Science, Multidisciplinary
Xilong Xu, Zhonglin He, Ying Dai, Baibiao Huang, Yandong Ma
Summary: The study introduces the concept of a single-valley state in a two-dimensional antiferromagnetic lattice, predicting its existence in single-layer BiFeO3 through tight-binding model analysis and first-principles calculations. This enriches the physics of two-dimensional valleytronics and offers a promising avenue to observe strong valley-polarized phenomena.
Article
Physics, Particles & Fields
Henry Shackleton, Subir Sachdev
Summary: We analyze a Higgs transition from a U(1) Dirac spin liquid to a gapless Z(2) spin liquid and conjecture that this transition describes the critical theory separating the gapless Z(2) spin liquid of the J(1)-J(2) model from one of the two proximate ordered phases.
JOURNAL OF HIGH ENERGY PHYSICS
(2022)
Review
Physics, Multidisciplinary
Debanjan Chowdhury, Antoine Georges, Olivier Parcollet, Subir Sachdev
Summary: This review focuses on the Sachdev-Ye-Kitaev (SYK) model and its relevance to nonFermi liquids in condensed matter physics. The study explores the phase diagrams of models with local electronic correlations, which display SYK physics. It also investigates the connection between the SYK model and theories of sharp Fermi surfaces without quasiparticles. Furthermore, the review provides an overview of the links between the SYK model and quantum gravity.
REVIEWS OF MODERN PHYSICS
(2022)
Article
Multidisciplinary Sciences
Zheng Yan, Rhine Samajdar, Yan-Cheng Wang, Subir Sachdev, Zi Yang Meng
Summary: In this study, a large-scale quantum Monte Carlo simulation is performed on an extended triangular lattice quantum dimer model with terms in the Hamiltonian that annihilate and create single dimers. The results show the existence of distinct odd and even Z(2) spin liquids, along with several phases with no topological order. Additionally, dynamic spectra of these phases are presented, with implications for experiments on Rydberg atoms.
NATURE COMMUNICATIONS
(2022)
Article
Physics, Multidisciplinary
Rhine Samajdar, Darshan G. Joshi, Yanting Teng, Subir Sachdev
Summary: Strongly interacting arrays of Rydberg atoms provide versatile platforms for exploring exotic many-body phases and dynamics of correlated quantum systems. Motivated by recent experimental advances, we show that the combination of Rydberg interactions and appropriate lattice geometries naturally leads to emergent Z(2) gauge theories endowed with matter fields. We also discuss the natures of the fractionalized excitations of these Z(2) spin liquid states using both fermionic and bosonic parton theories and illustrate their rich interplay with proximate solid phases.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Haoyu Guo, Darshan G. Joshi, Subir Sachdev
Summary: In this study, we calculate the thermal Hall coefficient of phonons scattering off a defect with multiple energy levels. Our results show that the perturbative contribution in the phonon-defect coupling is proportional to the phonon lifetime and has a side-jump interpretation. We also find that the thermal Hall angle is independent of the phonon lifetime.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2022)
Article
Physics, Multidisciplinary
Zheng Yan, Yan-Cheng Wang, Rhine Samajdar, Subir Sachdev, Zi Yang Meng
Summary: We perform large-scale quantum Monte Carlo simulations on a realistic Hamiltonian of kagome-lattice Rydberg atom arrays and analyze their static and dynamic properties. We find emergent glassy behavior in a region of parameter space between two valence bond solid phases. The extent and phase transitions of this glassy phase as well as its slow time dynamics and experimental considerations for its detection are discussed. Our proposal opens up a new route to studying real-time glassy phenomena and highlights the potential for quantum simulation of distinct phases of quantum matter.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Maine Christos, Zhu-Xi Luo, Henry Shackleton, Ya-Hui Zhang, Mathias S. Scheurer, Subir Sachdev
Summary: Confined quantum spin liquid in hole-doped cuprates is described in this article. The spin liquid is described by a SU(2) gauge theory of Nf = 2 massless Dirac fermions. Confinement is argued to occur via the Higgs condensation of bosonic chargons carrying fundamental SU(2) gauge charges. At half-filling, there is a low-energy theory of the Higgs sector with Nb=2 relativistic bosons and an emergent SO(5)b global symmetry. A conformal SU(2) gauge theory with Nf=2 fundamental fermions, Nb=2 fundamental bosons, and a SO(5)f x SO(5)b global symmetry is proposed, which describes a deconfined quantum critical point.
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
(2023)
Article
Physics, Multidisciplinary
Xiaoyang Huang, Subir Sachdev, Andrew Lucas
Summary: Using holographic duality, this paper presents a controlled theory of quantum critical points without quasiparticles at finite disorder and finite charge density. The fixed points are obtained by perturbing a disorder-free quantum critical point with relevant disorder, and the critical exponents and thermoelectric transport coefficients are calculated.
PHYSICAL REVIEW LETTERS
(2023)
Article
Multidisciplinary Sciences
Aavishkar A. Patel, Haoyu Guo, Ilya Esterlis, Subir Sachdev
Summary: This study considers the coupling of two-dimensional metals with quantum critical scalars and finds that these metals exhibit strange metal behavior at low temperatures, characterized by a linear resistivity and a specific heat that follows a T ln(1/T) relationship. The study also provides an explanation for the theoretical bound on the transport scattering time.
Article
Materials Science, Multidisciplinary
Alexander Nikolaenko, Jonas von Milczewski, Darshan G. Joshi, Subir Sachdev
Summary: The pseudogap metal phase of hole-doped cuprates can be described by small Fermi surfaces of electronlike quasiparticles enclosing a volume violating the Luttinger relation. The existence of additional fractionalized excitations, considered as fractionalized remnants of the paramagnon, is required for this violation. A gauge theory is presented for the bosonic spinons, a Higgs field, and an ancilla layer of fermions coupled to the original electrons, fractionalizing the paramagnon into the spin liquid described by C P 1 U(1) gauge theory. It displays conventional phases, including the large Fermi surface Fermi liquid and phases with spin density wave order, along with the small Fermi surface pseudogap metal.
Article
Physics, Multidisciplinary
Chenyuan Li, Subir Sachdev, Darshan G. Joshi
Summary: We investigated models of electrons in the Sachdev-Ye-Kitaev class with random and all-to-all electron hopping, electron spin exchange, and Cooper-pair hopping. An attractive on-site interaction between electrons results in superconductivity at low temperatures. Depending on the relative strengths of the hopping and spin exchange, the normal state at the critical temperature can be either a Fermi-liquid or a non-Fermi liquid. We conducted a large-M study of the normal state to superconductor phase transition and described the transition temperature, the superconducting order parameter, and the electron spectral functions. We compared the effects of different normal states on the superconductivity emergence.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Physics, Multidisciplinary
Cole Miles, Rhine Samajdar, Sepehr Ebadi, Tout T. Wang, Hannes Pichler, Subir Sachdev, Mikhail D. Lukin, Markus Greiner, Kilian Q. Weinberger, Eun-Ah Kim
Summary: Machine learning is a promising approach for studying complex phenomena with rich datasets. This study introduces a hybrid-correlation convolutional neural network (hybrid-CCNN) and applies it to experimental data generated by a programmable quantum simulator. The hybrid-CCNN is able to discover and identify new quantum phases on square lattices with programmable interactions. This combination of programmable quantum simulators with machine learning provides a powerful tool for exploring correlated quantum states of matter.
PHYSICAL REVIEW RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Haoyu Guo, Aavishkar A. Patel, Ilya Esterlis, Subir Sachdev
Summary: This study describes the coupling of Fermi surface with a scalar field using a 1/N expansion, computes the conductivity of the system in two spatial dimensions for a critical scalar, and finds a Drude contribution as well as the vanishing coefficient of the proposed 1/omega(2/3) contribution to the optical conductivity at frequency omega for a convex Fermi surface. The study also investigates the influence of impurity scattering on the fermions and observes that while the self-energy resembles a marginal Fermi liquid, the resistivity and optical conductivity behave like a Fermi liquid.
Article
Materials Science, Multidisciplinary
Aman Kumar, Subir Sachdev, Vikram Tripathi
Summary: Motivated by the pseudogap-Fermi liquid transition in doped Mott insulators, this study examines the excitations of a t-J model with random and all-to-all hopping and exchange. It is found that at low dopings, magnons and emergent JW fermions are stable and well-defined, while Landau quasiparticles are unstable. Upon crossing a critical doping value around pc = 1/3, the stabilities of Landau quasiparticles and the other two are interchanged, and near the critical doping, all these quasiparticles are ill defined. The critical point is thus associated with a localization transition in the many-body Hilbert space.
Article
Materials Science, Multidisciplinary
Marcin Kalinowski, Rhine Samajdar, Roger G. Melko, Mikhail D. Lukin, Subir Sachdel, Soonwon Choi
Summary: Motivated by recent experimental realizations of exotic phases of matter on programmable quantum simulators, this study investigates quantum phase transitions in a Rydberg atom array on a square lattice with both open and periodic boundary conditions. The researchers identify several types of phase transitions and provide analytical understanding of their nature, using the framework of Landau-Ginzburg-Wilson theory. Interestingly, they also find that the boundary itself undergoes a second-order quantum phase transition under open boundary conditions.
