723 citations · 3k across the 43 of their papers we have counts for
44 papers
Fermi surface change and -wave superconductivity in the square lattice Kondo-Heisenberg model
Alexander Nikolaenko, Riccardo Rende, Luciano Loris Viteritti +2
We study the two-dimensional Kondo-Heisenberg model on a square lattice, with the conduction electrons away from half-filling, using neural network quantum states. Mapping the grou…
Strong pairing from small Fermi surface beyond weak coupling: Application to LaNiO
Hui Yang, Hanbit Oh, Ya-Hui Zhang
The studies of high-temperature superconductors raise a fundamental question: Can a small Fermi surface phase, which violates the Luttinger theorem, exist and give rise to supercon…
S-wave pairing in a two-orbital t-J model on triangular lattice: possible application to PbCu(PO)O
Hanbit Oh, Ya-Hui Zhang
Recently room temperature superconductor was claimed in PbCu(PO)O (also known as LK-99) with . Density functional theory (DFT) calculations sug…
Ancilla wavefunctions of Mott insulator and pseudogap metal through quantum teleportation
Boran Zhou, Ya-Hui Zhang
Weak Mott regime with finite U is a wonderful region to search for quantum spin liquid, but it is challenging to write down a wavefunction capturing both spin liquid and charge flu…
Type II t-J model and shared antiferromagnetic spin coupling from Hund's rule in superconducting LaNiO
Hanbit Oh, Ya-Hui Zhang
Recently, a 80 K superconductor was discovered in LaNiO under high pressure. Density function theory (DFT) calculations identify , as the active…
Numerical signatures of ultra-local criticality in a one dimensional Kondo lattice model
Alexander Nikolaenko, Ya-Hui Zhang
Heavy fermion criticality has been a long-standing problem in condensed matter physics. Here we study a one-dimensional Kondo lattice model through numerical simulation and observe…
Exciton and light induced ferromagnetism from doping a moiré Mott insulator
Hui Yang, Ya-Hui Zhang
Significant efforts have been dedicated to achieving excitonic insulators. In this paper, we explore a new problem of doping excitons into a Mott insulator instead of a band insula…
XY* transition and extraordinary boundary criticality from fractional exciton condensation in quantum Hall bilayer
Ya-Hui Zhang, Zheng Zhu, Ashvin Vishwanath
XY* transitions represent one of the simplest examples of unconventional quantum criticality, in which fractionally charged excitations condense into a superfluid, and display nove…
Approximate SU(4) spin models on triangular and honeycomb lattices in twisted AB-Stacked WSe homo-bilayer
Shuchen Zhang, Boran Zhou, Ya-Hui Zhang
In this paper, we derive lattice models for the narrow moiré bands of the AB-stacked twisted WSe homobilayer through continuum model and Wannier orbital construction. Previous…
A model of -wave superconductivity, antiferromagnetism, and charge order on the square lattice
Maine Christos, Zhu-Xi Luo, Henry Shackleton +3
Early studies proposed a connection between cuprate superconductivity and fractionalized spin liquid states. But the low temperature phase diagram is dominated by states without fr…
Chiral and nodal superconductors in t-J model with valley contrasting flux on triangular moiré lattice
Boran Zhou, Ya-Hui Zhang
Recent experimental progresses have made it possible to simulate spin 1/2 Hubbard model on triangular lattice in moiré materials formed by transition metal dichalcogenide (TMD) het…
Excitonic Chern insulator and kinetic ferromagnetism in MoTe/WSe moiré bilayer
Zhihuan Dong, Ya-Hui Zhang
We propose a new mechanism for quantum anomalous Hall (QAH) effect in the AB stacked MoTe/WSe system. Based on the observation that the inter-layer tunneling is suppressed…
Deconfined criticalities and dualities between chiral spin liquid, topological superconductor and charge density wave Chern insulator
Xue-Yang Song, Ya-Hui Zhang
We propose bi-critical and tri-critical theories between chiral spin liquid (CSL), topological superconductor (SC) and charge density wave (CDW) ordered Chern insulator with Chern…
Doping a Mott insulator with excitons in moiré bilayer: fractional superfluid, neutral Fermi surface and Mott transition
Ya-Hui Zhang
In this paper we explore possible phases arising from doping neutral excitons into a Mott insulator in the context of moiré bilayers. We consider two moiré layers coupled together…
Spectroscopy Signatures of Electron Correlations in a Trilayer Graphene/hBN Moiré Superlattice
Jixiang Yang, Guorui Chen, Tianyi Han +12
ABC-stacked trilayer graphene/hBN moiré superlattice (TLG/hBN) has emerged as a playground for correlated electron physics. We report spectroscopy measurements of dual-gated TLG/hB…
Pair-density-wave superconductor from doping Haldane chain and rung-singlet ladder
Ya-Hui Zhang, Ashvin Vishwanath
We report the numerical discovery of a pair-density-wave (PDW) superconductor from doping either (i) a spin-one Haldane chain or (ii) a two-leg ladder in the rung singlet phase in…
Electronic spectra with paramagnon fractionalization in the single band Hubbard model
Eric Mascot, Alexander Nikolaenko, Maria Tikhanovskaya +3
We examine the spectral properties of a recently proposed theory of the intermediate temperature pseudogap metal phase of the cuprates. We show that this theory can be obtained fro…
Doping a moiré Mott Insulator: A t-J model study of twisted cuprates
Xue-Yang Song, Ya-Hui Zhang, Ashvin Vishwanath
We theoretically investigate twisted structures where each layer is composed of a strongly correlated material. In particular, we study a twisted t-J model of cuprate multilayers w…
Symmetry-broken Chern insulators in twisted double bilayer graphene
Minhao He, Jiaqi Cai, Ya-Hui Zhang +7
Twisted double bilayer graphene (tDBG) has emerged as an especially rich platform for studying strongly correlated and topological states of matter. The material features moiré ban…
SU(4) chiral spin liquid, exciton supersolid and electric detection in moiré bilayers
Ya-Hui Zhang, D. N. Sheng, Ashvin Vishwanath
We propose moiré bilayer as a platform where exotic quantum phases can be stabilized and electrically detected. Moiré bilayer consists of two separate moiré superlattice layers cou…
Small to large Fermi surface transition in a single band model, using randomly coupled ancillas
Alexander Nikolaenko, Maria Tikhanovskaya, Subir Sachdev +1
We describe a solvable model of a quantum transition in a single band model involving a change in the size of the electron Fermi surface without any symmetry breaking. In a model w…
Spin-orbit driven ferromagnetism at half moiré filling in magic-angle twisted bilayer graphene
Jiang-Xiazi Lin, Ya-Hui Zhang, Erin Morissette +7
Strong electron correlation and spin-orbit coupling (SOC) provide two non-trivial threads to condensed matter physics. When these two strands of physics come together, a plethora o…
Competing correlated states and abundant orbital magnetism in twisted monolayer-bilayer graphene
Minhao He, Ya-Hui Zhang, Yuhao Li +5
Flat band moiré superlattices have recently emerged as unique platforms for investigating the interplay between strong electronic correlations, nontrivial band topology, and multip…
Doping the chiral spin liquid -- topological superconductor or chiral metal?
Xue-Yang Song, Ashvin Vishwanath, Ya-Hui Zhang
We point out that there are two different chiral spin liquid states on the triangular lattice and discuss the conducting states that are expected on doping them. These states label…