Publications (310)
Scaling universal Fermi network toward ground states: A diffusion-Monte-Carlo assessment
Yu-Sheng Li, Saskia Poldmaa, Tzen Ong +4
In this work, we show that Fermi Sets---a provably universal neural network architecture for fermionic wavefunctions---can be systematically scaled up to find interacting ground st…
Prediction of superconductivity in mass-asymmetric electron-hole bilayers
Luca Nashabeh, Liang Fu
We study density-balanced, mass-asymmetric electron-hole bilayers as a tunable platform for correlated quantum phases. With independent control of carrier density and interlayer se…
Topology, Delocalization via Average Symmetry and the Symplectic Anderson Transition
Liang Fu, C. L. Kane
A field theory of the Anderson transition in two dimensional disordered systems with spin-orbit interactions and time-reversal symmetry is developed, in which the proliferation of…
Josephson diode effect from Cooper pair momentum in a topological semimetal
Banabir Pal1, Anirban Chakraborty, Pranava K. Sivakumar +11
In the presence of an external magnetic field Cooper pairs in noncentrosymmetric superconductors can acquire finite momentum. Recent theory predicts that such finite-momentum pairi…
Quantum Spin Hall Effect and Topological Field Effect Transistor in Two-Dimensional Transition Metal Dichalcogenides
Xiaofeng Qian, Junwei Liu, Liang Fu +1
We report a new class of large-gap quantum spin Hall insulators in two-dimensional transition metal dichalcogenides, namely, MX with M=(Mo, W) and X=(S, Se, and Te), whose topo…
Observation of Fractionally Quantized Anomalous Hall Effect
Heonjoon Park, Jiaqi Cai, Eric Anderson +17
The integer quantum anomalous Hall (QAH) effect is a lattice analog of the quantum Hall effect at zero magnetic field. This striking transport phenomenon occurs in electronic syste…
Topological Insulators with Inversion Symmetry
Liang Fu, C. L. Kane
Topological insulators are materials with a bulk excitation gap generated by the spin orbit interaction, and which are different from conventional insulators. This distinction is c…
Geometric bound on structure factor
Yugo Onishi, Alexander Avdoshkin, Liang Fu
We show that a quadratic form of quantum geometric tensor in -space sets a bound on the term in the static structure factor at small . Bands that saturate…
Large Quantum Anomalous Hall Effect in Spin-Orbit Proximitized Rhombohedral Graphene
Tonghang Han, Zhengguang Lu, Yuxuan Yao +8
The quantum anomalous Hall effect (QAHE) is a robust topological phenomenon featuring quantized Hall resistance at zero magnetic field. We report the QAHE in a rhombohedral pentala…
Classification of Critical Points in Energy Bands Based on Topology, Scaling and Symmetry
Noah F. Q. Yuan, Liang Fu
A critical point of the energy dispersion is the momentum where electron velocity vanishes. At the corresponding energy, the density of states (DOS) exhibits non-analyticity such a…
Topological semimetals and topological insulators in rare earth monopnictides
Minggang Zeng, Chen Fang, Guoqing Chang +5
We use first principles calculations to study the electronic properties of rock salt rare earth monopnictides La (N, P, As, Sb, Bi). A new type of topological band crossing…
Topological Crystalline Insulators in the SnTe Material Class
Timothy H. Hsieh, Hsin Lin, Junwei Liu +3
Topological crystalline insulators are new states of matter in which the topological nature of electronic structures arises from crystal symmetries. Here we predict the first mater…
Experimental observation of Dirac-like surface states and topological phase transition in PbSnTe(111) films
Chenhui Yan, Junwei Liu, Yunyi Zang +12
The surface of a topological crystalline insulator (TCI) carries an even number of Dirac cones protected by crystalline symmetry. We epitaxially grew high quality PbSnT…
Multichannel charge Kondo effect and non-Fermi liquid fixed points in conventional and topological superconductor islands
MichaÅ Papaj, Zheng Zhu, Liang Fu
We study multiterminal Majorana and conventional superconducting islands in the vicinity of the charge degeneracy point using bosonization and numerical renormalization group. Both…
Maximally-localized Wannier orbitals and the extended Hubbard model for the twisted bilayer graphene
Mikito Koshino, Noah F. Q. Yuan, Takashi Koretsune +3
We develop an effective extended Hubbard model to describe the low-energy electronic properties of the twisted bilayer graphene. By using the Bloch states in the effective continuu…
Majorana fermions in a superconducting Mobius strip
Yuan Pang, Jie Shen, Junhua Wang +12
Recently, much attention has been paid to search for Majorana fermions in solid-state systems. Among various proposals there is one based on radio-frequency superconducting quantum…
Interfacial ferroelectricity in rhombohedral-stacked bilayer transition metal dichalcogenides
Xirui Wang, Kenji Yasuda, Yang Zhang +6
Van der Waals (vdW) materials have greatly expanded our design space of heterostructures by allowing individual layers to be stacked at non-equilibrium configurations, for example…
Evidence for Majorana bound state in an iron-based superconductor
Dongfei Wang, Lingyuan Kong, Peng Fan +12
The search for Majorana bound state (MBS) has recently emerged as one of the most active research areas in condensed matter physics, fueled by the prospect of using its non-Abelian…
Layer Hall effect in a 2D topological Axion antiferromagnet
Anyuan Gao, Yu-Fei Liu, Chaowei Hu +33
While ferromagnets have been known and exploited for millennia, antiferromagnets (AFMs) were only discovered in the 1930s. The elusive nature indicates AFMs' unique properties: At…
Transport properties of a half-filled Chern band at the electron and composite fermion phases
Ady Stern, Liang Fu
We consider a half-filled Chern band and its transport properties in two phases that it may form, the electronic Fermi liquid and the composite-fermion Fermi liquid. For weak disor…
Quantized Thermoelectric Hall Effect Induces Giant Power Factor in a Topological Semimetal
Fei Han, Nina Andrejevic, Thanh Nguyen +14
Thermoelectrics are promising by directly generating electricity from waste heat. However, (sub-)room-temperature thermoelectrics have been a long-standing challenge due to vanishi…
Magic in twisted transition metal dichalcogenide bilayers
Trithep Devakul, Valentin Crépel, Yang Zhang +1
The long wavelength moiré superlattices in twisted 2D structures have emerged as a highly tunable platform for strongly correlated electron physics. We study the moiré bands in t…
Spontaneous vortex-antivortex lattice and Majorana fermions in rhombohedral graphene
Filippo Gaggioli, Daniele Guerci, Liang Fu
The discovery of superconducting states in multilayer rhombohedral graphene with spin and valley polarization has raised an interesting question: how does superconductivity cope wi…
Itinerant spin polaron and metallic ferromagnetism in semiconductor moiré superlattices
Margarita Davydova, Yang Zhang, Liang Fu
Itinerant spin polaron and metallic ferromagnetism are theoretically predicted in the Mott insulator in semiconductor moiré superlattices doped below and above half filling of the…
Valley-selective optical Stark effect in monolayer WS2
Edbert J. Sie, James W. McIver, Yi-Hsien Lee +3
Breaking space-time symmetries in two-dimensional crystals (2D) can dramatically influence their macroscopic electronic properties. Monolayer transition-metal dichalcogenides (TMDs…
Non-Abelian fractionalization in topological minibands
Aidan P. Reddy, Nisarga Paul, Ahmed Abouelkomsan +1
Motivated by the recent discovery of fractional quantum anomalous Hall states in moiré systems, we consider the possibility of realizing non-Abelian phases in topological miniband…
Moiré Landau fans and magic zeros
Nisarga Paul, Philip J. D. Crowley, Trithep Devakul +1
We study the energy spectrum of moiré systems under a uniform magnetic field. The superlattice potential generally broadens Landau levels into Chern bands with finite bandwidth. H…
Topological bound on structure factor
Yugo Onishi, Liang Fu
We show that the static structure factor of general many-body systems with symmetry has a lower bound determined only by the ground state Chern number. Our bound relies only…
Orthogonal Magnetization and Symmetry Breaking in Pyrochlore Iridate Eu2Ir2O7
Tian Liang, Timothy H. Hsieh, Jun J. Ishikawa +3
Electrons in the pyrochore iridates experience a large interaction energy in addition to a strong spin-orbit interaction. Both features make the iridates promising for realizing no…
Self-learning Monte Carlo with Deep Neural Networks
Huitao Shen, Junwei Liu, Liang Fu
Self-learning Monte Carlo (SLMC) method is a general algorithm to speedup MC simulations. Its efficiency has been demonstrated in various systems by introducing an effective model…
Topological Insulator nano-SQUID: Flux-tunable platform for topological superconductivity
Ella Nikodem, Jakob Schluck, Henry F. Legg +5
Many efforts have been made in the past decade to realize topological superconductivity using superconducting proximity effect, but an ideal platform is still lacking. A 3D topolog…
Majorana Superconducting Qubit
Constantin Schrade, Liang Fu
We propose a platform for universal quantum computation that uses conventional -wave superconducting leads to address a topological qubit stored in spatially separated Majorana…
Topological Superconductivity and Surface Andreev Bound States in Doped Semiconductors: Application to CuxBi2Se3
Timothy H. Hsieh, Liang Fu
The recently discovered superconductor CuxBi2Se3[1] is a candidate for three-dimensional time-reversal-invariant topological superconductors[2], which are predicted to have robust…
Odd-parity superconductors with two-component order parameters: nematic and chiral, full gap and Majorana node
Jörn W. F. Venderbos, Vladyslav Kozii, Liang Fu
Motivated by the recent experiment indicating that superconductivity in the doped topological insulator CuBiSe has an odd-parity pairing symmetry with rotational symmet…
Thermoelectric Hall conductivity and figure of merit in Dirac/Weyl materials
Vladyslav Kozii, Brian Skinner, Liang Fu
We calculate the thermoelectric response coefficients of three-dimensional Dirac or Weyl semimetals as a function of magnetic field, temperature, and Fermi energy. We focus in part…
Interacting Dirac fermions under spatially alternating pseudo-magnetic field: Realization of spontaneous quantum Hall effect
Jörn W. F. Venderbos, Liang Fu
Both topological crystalline insulators surfaces and graphene host multi-valley massless Dirac fermions which are not pinned to a high-symmetry point of the Brillouin zone. Strain…
Fractional Quantum Anomalous Hall Effect in a Graphene Moire Superlattice
Zhengguang Lu, Tonghang Han, Yuxuan Yao +7
The fractional quantum anomalous Hall effect (FQAHE), the analog of the fractional quantum Hall effect1 at zero magnetic field, is predicted to exist in topological flat bands unde…
Physical Implementation of a Majorana Fermion Surface Code for Fault-Tolerant Quantum Computation
Sagar Vijay, Liang Fu
We propose a physical realization of a commuting Hamiltonian of interacting Majorana fermions realizing topological order, using an array of Josephson-coupled topological s…
Superconductivity and strong interactions in a tunable moiré quasiperiodic crystal
Aviram Uri, Sergio C. de la Barrera, Mallika T. Randeria +10
Electronic states in quasiperiodic crystals generally preclude a Bloch description, rendering them simultaneously fascinating and enigmatic. Owing to their complexity and relative…
SU(2)-invariant spin liquids on the triangular lattice with spinful Majorana excitations
Rudro R. Biswas, Liang Fu, Chris R. Laumann +1
We describe a new class of spin liquids with global SU(2) spin rotation symmetry in spin 1/2 systems on the triangular lattice, which have real Majorana fermion excitations carryin…
Unconventional Superconductivity and Density Waves in Twisted Bilayer Graphene
Hiroki Isobe, Noah F. Q. Yuan, Liang Fu
We study electronic ordering instabilities of twisted bilayer graphene with electrons per supercell, where correlated insulator state and superconductivity are recently obser…
Thermal plasmon resonantly enhances electron scattering in Dirac/Weyl semimetals
Vladyslav Kozii, Liang Fu
We study the inelastic scattering rate due to the Coulomb interaction in three-dimensional Dirac/Weyl semimetals at finite temperature. We show that the perturbation theory diverge…
Anisotropy Driven Transition from Moore-Read State to Quantum Hall Stripes
Zheng Zhu, Inti Sodemann, D. N. Sheng +1
We investigate the nature of the quantum Hall liquid in a half-filled second Landau level () as a function of band mass anisotropy using numerical exact diagonalization (ED) a…
Large, nonsaturating thermopower in a quantizing magnetic field
Brian Skinner, Liang Fu
The thermoelectric effect is the generation of an electrical voltage from a temperature gradient in a solid material due to the diffusion of free charge carriers from hot to cold.…
Terahertz detection based on nonlinear Hall effect without magnetic field
Yang Zhang, Liang Fu
We propose a method for broadband long-wavelength photodetection using the nonlinear Hall effect in non-centrosymmetric quantum materials. The inherently quadratic relation between…
Accurate Self-Attention Wavefunctions at Large Scale
Filippo Gaggioli, Sam Azadi, Liang Fu
The authors apply self‑attention neural network variational wavefunctions to the two‑dimensional homogeneous electron gas with up to 169 particles, achieving energies lower than st…
Proximity-effect-induced superconductivity in topological insulator-related material Bi2Se3
Fan Yang, Fanming Qu, Jie Shen +8
We have studied the electron transport properties of topological insulator-related material Bi2Se3 near the superconducting Pb-Bi2Se3 interface, and found that a superconducting st…
Charge Transfer Excitations, Pair Density Waves, and Superconductivity in Moiré Materials
Kevin Slagle, Liang Fu
Transition metal dichalcogenide (TMD) bilayers are a new class of tunable moiré systems attracting interest as quantum simulators of strongly-interacting electrons in two dimensio…
Magic-angle helical trilayer graphene
Trithep Devakul, Patrick J. Ledwith, Li-Qiao Xia +4
We propose helical trilayer graphene (HTG), a helical structure featuring identical rotation angles between three consecutive layers of graphene, as a unique…
Compressible quantum liquid with vanishing Drude weight
Ahmed Abouelkomsan, Nisarga Paul, Ady Stern +1
We explore the possibility of quantum liquids that are compressible but have vanishing DC conductivity in the absence of disorder. We show that the composite Fermi liquid emerging…
Making s-wave superconductors topological with magnetic field
Daniil S. Antonenko, Liang Fu, Leonid. I Glazman
We show that a two-dimensional -wave superconductor may become topological in the presence of a magnetic field that leads to the formation of an Abrikosov vortex lattice. Below…
Direct observation of a photoinduced topological phase transition in Bi-doped (Pb,Sn)Se
Masataka Mogi, Dongsung Choi, Louis Primeau +6
Ultrafast photoexcitation offers a novel approach to manipulating quantum materials. One of the long-standing goals in this field is to achieve optical control over topological pro…
Valley Stoner Instability of the Composite Fermi Sea
Zheng Zhu, D. N. Sheng, Liang Fu +1
We study two-component electrons in the lowest Landau level at total filling factor with anisotropic mass tensors and principal axes rotated by as realized in Alu…
Quantum Error Correction for Complex and Majorana Fermion Qubits
Sagar Vijay, Liang Fu
We introduce error-correcting codes that can correct for fermion parity-violating (quasiparticle poisoning) and parity-conserving errors in systems of complex fermions and of Major…
Topological phases protected by point group symmetry
Hao Song, Sheng-Jie Huang, Liang Fu +1
We consider symmetry protected topological (SPT) phases with crystalline point group symmetry, dubbed point group SPT (pgSPT) phases. We show that such phases can be understood in…
Sustainability-Driven Exploration of Topological Material
Artittaya Boonkird, Nathan Drucker, Manasi Mandal +9
Topological materials are at the forefront of quantum materials research, offering tremendous potential for next-generation energy and information devices. However, current investi…
Ferromagnetism and Topology of the Higher Flat Band in a Fractional Chern Insulator
Heonjoon Park, Jiaqi Cai, Eric Anderson +18
The recent observation of the fractional quantum anomalous Hall effect in moiré fractional Chern insulators provides an opportunity to investigate zero magnetic field anyons. To p…
A New Kind of Topological Quantum Order: A Dimensional Hierarchy of Quasiparticles Built from Stationary Excitations
Sagar Vijay, Jeongwan Haah, Liang Fu
We introduce exactly solvable models of interacting (Majorana) fermions in spatial dimensions that realize a new kind of topological quantum order, building on a model pr…
Creating Majorana modes from segmented Fermi surface
MichaÅ Papaj, Liang Fu
We present a new platform for creating Majorana bound states from 2D gapless superconducting state in spin-helical systems under the in-plane Zeeman field. Topological 1D channels…
Angle-resolved transport nonreciprocity and spontaneous symmetry breaking in twisted trilayer graphene
Naiyuan James Zhang, Jiang-Xiazi Lin, Dmitry V. Chichinadze +5
The ability to identify and characterize spontaneous symmetry breaking is central to our understanding of 2D materials with strong correlation, such as the moiré flat bands in mag…
Supermetal
Hiroki Isobe, Liang Fu
We study the effect of electron interaction in an electronic system with a high-order Van Hove singularity, where the density of states shows a power-law divergence. Owing to scale…
Zero-point energy of solids from vacuum fluctuation and quantum geometric force
Yugo Onishi, Liang Fu
We show that quantum fluctuations of electromagnetic fields induce an additional zero-point energy in solids, which scales with the volume. For insulators, the zero-point energy de…
Fractionalization in Superconductor Josephson Junction Arrays Hinged by Quantum Spin Hall edges
Cenke Xu, Liang Fu
In this paper we study a novel superconductor-ferromagnet-superconductor (SC-FM-SC) Josephson junction array deposited on top of a two-dimensional quantum spin Hall (QSH) insulator…
Observation of Ultrahigh Mobility Surface States in a Topological Crystalline Insulator by Infrared Spectroscopy
Ying Wang, Guoyu Luo, Junwei Liu +5
Topological crystalline insulators (TCIs) possess metallic surface states protected by crystalline symmetry, which are a versatile platform for exploring topological phenomena and…
Artificial Intelligence for Quantum Matter: Finding a Needle in a Haystack
Khachatur Nazaryan, Filippo Gaggioli, Yi Teng +1
Neural networks (NNs) have great potential in solving the ground state of various many-body problems. However, several key challenges remain to be overcome before NNs can tackle pr…
Clean 2D superconductivity in a bulk van der Waals superlattice
Aravind Devarakonda, Hisashi Inoue, Shiang Fang +7
Advances in low-dimensional superconductivity are often realized through improvements in material quality. Apart from a small group of organic materials, there is a near absence of…
Quantum frequency doubling in the topological insulator Bi2Se3
Pan He, Hiroki Isobe, Dapeng Zhu +3
The nonlinear Hall effect due to Berry curvature dipole (BCD) induces frequency doubling, which was recently observed in time-reversal-invariant materials. Here we report novel ele…
Quantum Hall ferroelectrics and nematics in multivalley systems
Inti Sodemann, Zheng Zhu, Liang Fu
We study broken symmetry states at integer Landau level fillings in multivalley quantum Hall systems whose low energy dispersions are anisotropic. When the Fermi surface of individ…
Stripe phases in WSe2/WS2 moiré superlattices
Chenhao Jin, Zui Tao, Tingxin Li +10
Stripe phases, in which the rotational symmetry of charge density is spontaneously broken, occur in many strongly correlated systems with competing interactions. One representative…
From Fractionalization to Chiral Topological Superconductivity in a Flat Chern Band
Daniele Guerci, Ahmed Abouelkomsan, Liang Fu
We show that interacting electrons in a flat Chern band can form, in addition to fractional Chern insulators, a chiral -wave topological superconductor that hosts neutral Majora…
Nonreciprocal Josephson current through a conical magnet
Lina Johnsen Kamra, Liang Fu
Superconductors can form ideal diodes carrying nondissipative supercurrents in the forward direction and dissipative currents in the backward direction. The Josephson diode has pro…
Observation of High-Temperature Dissipationless Fractional Chern Insulator
Heonjoon Park, Weijie Li, Chaowei Hu +13
The fractional quantum anomalous Hall effect has recently been experimentally observed in zero-field fractional Chern insulators (FCI). However, an outstanding challenge is the pre…
Odd-parity topological superconductor with nematic order: Application to CuxBi2Se3
Liang Fu
CuxBi2Se3 was recently proposed as a promising candidate for time-reversal-invariant topological superconductors[1]. In this work, we argue that the unusual anisotropy of the Knigh…
Anomalous Hall metal and fractional Chern insulator in twisted transition metal dichalcogenides
Valentin Crépel, Liang Fu
We predict robust Ising ferromagnetism driven by Coulomb interaction in the metallic phase of twisted transition metal dichalcogenides homobilayers for a range of small twist angle…
Non-collinear magnetic structure and multipolar order in EuIrO
Yilin Wang, Hongming Weng, Liang Fu +1
The magnetic properties of the pyrochlore iridate material EuIrO (5) have been studied based on the first principle calculations, where the crystal field splitting…
Electron Teleportation via Majorana Bound States in a Mesoscopic Superconductor
Liang Fu
Zero-energy Majorana bound states in superconductors have been proposed to be potential building blocks of a topological quantum computer, because quantum information can be encode…
Entangling power of neural networks
Taige Wang, Nisarga Paul, Liang Fu
Characterizing the complexity of correlations between subsystems is a fundamental task across information theory, machine learning, and science. In quantum physics, neural networks…
Magnetoelectric Control of Helical Light Emission in a Moiré Chern Magnet
Eric Anderson, Heonjoon Park, Kaijie Yang +7
Magnetoelectric effects and their coupling to light helicity are important for both fundamental science and applications in sensing, communication, and data storage. Traditional ap…
Moiré quantum chemistry: charge transfer in transition metal dichalcogenide superlattices
Yang Zhang, Noah F. Q. Yuan, Liang Fu
Transition metal dichalcogenide (TMD) bilayers have recently emerged as a robust and tunable moiré system for studying and designing correlated electron physics. In this work, by…
In-Plane Ferroelectric Tunnel Junction
Huitao Shen, Junwei Liu, Kai Chang +1
The ferroelectric material is an important platform to realize non-volatile memories. So far, existing ferroelectric memory devices utilize out-of-plane polarization in ferroelectr…
Non-Abelian nonsymmorphic chiral symmetries
Yi Yang, Hoi Chun Po, Vincent Liu +3
The Hofstadter model exemplifies a large class of physical systems characterized by particles hopping on a lattice immersed in a gauge field. Recent advancements on various synthet…
Universal relation between energy gap and dielectric constant
Yugo Onishi, Liang Fu
We establish a universal relation between the energy gap and the static dielectric constant for all insulating states. This relation yields an upper bound on the energy gap, which…
Enhanced anomalous Nernst effect in disordered Dirac and Weyl materials
MichaÅ Papaj, Liang Fu
We analyze the thermoelectric response of Dirac and Weyl semimetals using the semiclassical approach, focusing on the extrinsic contributions due to skew-scattering and side jump.…
Odd-Parity Pairing and Topological Superconductivity in a Strongly Spin-Orbit Coupled Semiconductor
Satoshi Sasaki, Zhi Ren, A. A. Taskin +3
The existence of topological superconductors preserving time-reversal symmetry was recently predicted, and they are expected to provide a solid-state realization of itinerant massl…
Quantum metric non-linear Hall effect in an antiferromagnetic topological insulator thin-film EuSn2As2
Hung-Ju Tien, Hsin Lin, Liang Fu +1
The quantum geometric structure of electrons introduces fundamental insights into understanding quantum effects in materials. One notable manifestation is the non-linear Hall effec…
Probing Neutral Majorana Fermion Edge Modes with Charge Transport
Liang Fu, C. L. Kane
We propose two experiments to probe the Majorana fermion edge states that occur at a junction between a superconductor and a magnet deposited on the surface of a topological insula…
Local Probes for Quantum Hall Ferroelectrics and Nematics
Pok Man Tam, Tongtong Liu, Inti Sodemann +1
Two-dimensional multi-valley electronic systems in which the dispersion of individual pockets has low symmetry give rise to quantum Hall ferroelectric and nematic states in the pre…
Solving fractional electron states in twisted MoTe with deep neural network
Di Luo, Timothy Zaklama, Liang Fu
The emergence of moiré materials, such as twisted transition-metal dichalcogenides (TMDs), has created a fertile ground for discovering novel quantum phases of matter. However, so…
Fractional correlated insulating states at filled magic angle twisted bilayer graphene
Kevin Zhang, Yang Zhang, Liang Fu +1
Although much progress has been made on the physics of magic angle twisted bilayer graphene at integer fillings, little attention has been given to fractional fillings. Here we sho…
Fracton Topological Order, Generalized Lattice Gauge Theory and Duality
Sagar Vijay, Jeongwan Haah, Liang Fu
We introduce a generalization of conventional lattice gauge theory to describe fracton topological phases, which are characterized by immobile, point-like topological excitations,…
Self-Learning Monte Carlo Method: Continuous-Time Algorithm
Yuki Nagai, Huitao Shen, Yang Qi +2
The recently-introduced self-learning Monte Carlo method is a general-purpose numerical method that speeds up Monte Carlo simulations by training an effective model to propose unco…
High-frequency rectification via chiral Bloch electrons
Hiroki Isobe, Su-Yang Xu, Liang Fu
Rectification is a process that converts electromagnetic fields into a direct current. Such a process underlies a wide range of technologies such as wireless communication, wireles…
Magic of high order van Hove singularity
Noah F. Q. Yuan, Hiroki Isobe, Liang Fu
We introduce a new type of van Hove singularity in two dimensions, where a saddle point in momentum space is changed from second-order to high-order. Correspondingly, the density o…
Spin-orbital groundstates of Superconducting doped topological insulators (A Majorana Platform)
L. Andrew Wray, Yuqi Xia, Su-Yang Xu +8
The BiSe class of topological insulators has recently been shown to undergo a superconducting transition upon hole or electron doping (Cu-BiSe with T=3.8$^o…
Observation of the dual quantum spin Hall insulator by density-tuned correlations in a van der Waals monolayer
Jian Tang, Thomas Siyuan Ding, Hongyu Chen +25
The convergence of topology and correlations represents a highly coveted realm in the pursuit of novel quantum states of matter. Introducing electron correlations to a quantum spin…
Dirac electron under periodic magnetic field: Platform for fractional Chern insulator and generalized Wigner crystal
Junkai Dong, Jie Wang, Liang Fu
We propose a platform for flat Chern band by subjecting two-dimensional Dirac materials -- such as graphene and topological insulator thin films -- to a periodic magnetic field, wh…
Simulating moiré quantum matter with neural network
Di Luo, David D. Dai, Liang Fu
Moiré materials provide an ideal platform for exploring quantum phases of matter. However, solving the many-electron problem in moiré systems is challenging due to strong correla…
A minimal and universal representation of fermionic wavefunctions (fermions = bosons + one)
Liang Fu
Representing fermionic wavefunctions efficiently is a central problem in quantum physics, chemistry and materials science. In this work, we introduce a universal and exact represen…
Artificial intelligence for artificial materials: moiré atom
Di Luo, Aidan P. Reddy, Trithep Devakul +1
Moiré engineering in atomically thin van der Waals heterostructures creates artificial quantum materials with designer properties. We solve the many-body problem of interacting el…
Detecting crystal symmetry fractionalization from the ground state: Application to spin liquids on the kagome lattice
Yang Qi, Liang Fu
In quantum spin liquid states, the fractionalized spinon excitations can carry fractional crystal symmetry quantum numbers, and this symmetry fractionalization distinguishes differ…