D. N. Sheng
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View article: Learning Survival Distributions with the Asymmetric Laplace Distribution
Learning Survival Distributions with the Asymmetric Laplace Distribution Open
Probabilistic survival analysis models seek to estimate the distribution of the future occurrence (time) of an event given a set of covariates. In recent years, these models have preferred nonparametric specifications that avoid directly e…
View article: Global phase diagram of D-wave superconductivity in the square-lattice <i>t-J</i> model
Global phase diagram of D-wave superconductivity in the square-lattice <i>t-J</i> model Open
The Hubbard and closely related t-J models are exciting platforms for unconventional superconductivity (SC). Through state-of-the-art density matrix renormalization group calculations using the grand canonical ensemble, we address open iss…
View article: Superconductivity in the lightly doped Hubbard model on the cylindrical honeycomb lattice
Superconductivity in the lightly doped Hubbard model on the cylindrical honeycomb lattice Open
We have performed large-scale density-matrix renormalization group studies of the lightly doped Hubbard model on the honeycomb lattice on long three- and four-leg cylinders. Here, we find that the ground state of the system upon lightly do…
View article: Anti-topological crystal and non-Abelian liquid in twisted semiconductor bilayers
Anti-topological crystal and non-Abelian liquid in twisted semiconductor bilayers Open
We show that electron crystals compete closely with non-Abelian fractional Chern insulators in the half-full second moiré band of twisted bilayer MoTe$_2$. Depending on the twist angle and microscopic model, these crystals can have non-zer…
View article: Quantum Melting of Generalized Wigner Crystals in Transition Metal Dichalcogenide Moiré Systems
Quantum Melting of Generalized Wigner Crystals in Transition Metal Dichalcogenide Moiré Systems Open
The generalized Wigner crystal (GWC) is a novel quantum phase of matter driven by further-range interaction at fractional fillings of a lattice. The role of further-range interaction as the driver for the incompressible state is akin to th…
View article: Robust non-Abelian even-denominator fractional Chern insulator in twisted bilayer MoTe$_2$
Robust non-Abelian even-denominator fractional Chern insulator in twisted bilayer MoTe$_2$ Open
A recent experiment observes a series of quantum spin Hall effects in transition metal dichalcogenide moiré MoTe$_2$ [K. Kang, et. al, Nature 628, 522-526 (2024)]. Among them, the vanishing Hall signal at the filling factor $ν=3$ implies a…
View article: Magnetic field induced partially polarized chiral spin liquid in a transition metal dichalcogenide moiré system
Magnetic field induced partially polarized chiral spin liquid in a transition metal dichalcogenide moiré system Open
As one of the most intriguing states of matter, the chiral spin liquid (CSL) has attracted much scientific interest while its existence and mechanism in crystalline strongly correlated systems remain hotly debated. On the other hand, stron…
View article: Chiral spin liquid and quantum phase diagram of spin-$1/2$ $J_1$-$J_2$-$J_χ$ model on the square lattice
Chiral spin liquid and quantum phase diagram of spin-$1/2$ $J_1$-$J_2$-$J_χ$ model on the square lattice Open
We study the spin-$1/2$ Heisenberg model on the square lattice with the first and second nearest-neighbor antiferromagnetic couplings $J_1$, $J_2$, as well as the three-spin scalar chiral coupling $J_χ$. Using density matrix renormalizatio…
View article: Quantum Melting of Generalized Wigner Crystals in Transition Metal Dichalcogenide Moiré Systems
Quantum Melting of Generalized Wigner Crystals in Transition Metal Dichalcogenide Moiré Systems Open
Generalized Wigner Crystal (GWC) is a novel quantum phase of matter driven by further-range interaction at fractional fillings of a lattice. The role of further range interaction as the driver for the incompressible state is akin to Wigner…
View article: Global Phase Diagram of D-wave Superconductivity in the Square-Lattice $t\text{-}J$ Model
Global Phase Diagram of D-wave Superconductivity in the Square-Lattice $t\text{-}J$ Model Open
The Hubbard and closely related $t\text-J$ models are exciting platforms for unconventional superconductivity (SC). Through state-of-the-art density matrix renormalization group calculations using the grand canonical ensemble, we address o…
View article: Singlet, triplet, and pair density wave superconductivity in the doped triangular-lattice moiré system
Singlet, triplet, and pair density wave superconductivity in the doped triangular-lattice moiré system Open
Recent experimental progress has established the twisted bilayer transition metal dichalcogenide (TMD) as a highly tunable platform for studying many-body physics. Particularly, the homobilayer TMDs under displacement field are believed to…
View article: Anomalous bilayer quantum Hall effect
Anomalous bilayer quantum Hall effect Open
In parallel to the condensed-matter realization of quantum Hall (Chern insulators), quantum spin Hall (topological insulators), and fractional quantum Hall (fractional Chern insulators) effects, we propose that bilayer flat band (FB) latti…
View article: Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators
Quantum Phase Diagram and Spontaneously Emergent Topological Chiral Superconductivity in Doped Triangular-Lattice Mott Insulators Open
The topological superconducting state is a highly sought-after quantum state hosting topological order and Majorana excitations. In this Letter, we explore the mechanism to realize the topological superconductivity (TSC) in the doped Mott …
View article: Singlet, Triplet and Pair Density Wave Superconductivity in the Doped Triangular-Lattice Moiré System
Singlet, Triplet and Pair Density Wave Superconductivity in the Doped Triangular-Lattice Moiré System Open
Recent experimental progress has established the twisted bilayer transition metal dichalcogenide (TMD) as a highly tunable platform for studying many-body physics. Particularly, the homobilayer TMDs under displacement field are believed to…
View article: Interaction-driven quantum anomalous Hall insulator in a Dirac semimetal
Interaction-driven quantum anomalous Hall insulator in a Dirac semimetal Open
Here, the interaction-driven quantum anomalous Hall (QAH) insulator has been sought for a long time in a Dirac semimetal with linear band touching points at the Fermi level. By combining exact diagonalization, density matrix renormalizatio…
View article: Quantum spin liquid with emergent chiral order in the triangular-lattice Hubbard model
Quantum spin liquid with emergent chiral order in the triangular-lattice Hubbard model Open
The interplay between spin frustration and charge fluctuation gives rise to an exotic quantum state in the intermediate-interaction regime of the half-filled triangular-lattice Hubbard model, while the nature of the state is under debate. …
View article: Topological Chiral and Nematic Superconductivity by Doping Mott Insulators on Triangular Lattice
Topological Chiral and Nematic Superconductivity by Doping Mott Insulators on Triangular Lattice Open
The mechanism of unconventional topological superconductivity (TSC) remains a long-standing issue. We investigate the quantum phase diagram of the extended t – J – Jχ model including spin chiral interactions on triangular lattice based on …
View article: Doped Mott insulators in the triangular-lattice Hubbard model
Doped Mott insulators in the triangular-lattice Hubbard model Open
Here we investigate the evolution of the Mott insulators in the triangular lattice Hubbard Model, as a function of hole doping δ in both the strong and intermediate coupling limits. Using the advanced density matrix renormalization group (…
View article: High-temperature fractional quantum Hall state in the Floquet kagome flat band
High-temperature fractional quantum Hall state in the Floquet kagome flat band Open
A fractional quantum Hall effect (FQHE) has been predicted in a topological flat band (FB) by a single-particle band structure combined with phenomenological theory or solution of a many-body lattice Hamiltonian with fuzzy parameters. A lo…
View article: Quantum Phases of Transition Metal Dichalcogenide Moiré Systems
Quantum Phases of Transition Metal Dichalcogenide Moiré Systems Open
Moir\\'e systems provide a rich platform for studies of strong correlation\nphysics. Recent experiments on hetero-bilayer transition metal dichalcogenide\n(TMD) Moir\\'e systems are exciting in that they manifest a relatively simple\nmodel…
View article: Coexistence of non-Abelian chiral spin liquid and magnetic order in a spin-1 antiferromagnet
Coexistence of non-Abelian chiral spin liquid and magnetic order in a spin-1 antiferromagnet Open
We study the ground-state properties of a spin-1 Heisenberg model on a square lattice with the first- and second-nearest-neighbor antiferromagnetic couplings $J_1$ and $J_2$ and a three-spin scalar chirality term $J_\\chi$. Using the densi…
View article: Unconventional quantum phase transitions in a one-dimensional Lieb-Schultz-Mattis system
Unconventional quantum phase transitions in a one-dimensional Lieb-Schultz-Mattis system Open
We study quantum phases and phase transitions in a one-dimensional\ninteracting fermion system with a Lieb-Schultz-Mattis (LSM) type anomaly.\nSpecifically, the inversion symmetry enforces any symmetry-preserving gapped\nground state of th…
View article: Interaction-driven quantum anomalous Hall insulator in Dirac semimetal
Interaction-driven quantum anomalous Hall insulator in Dirac semimetal Open
The interaction-driven quantum anomalous Hall (QAH) insulator has been sought for a long time in a Dirac semimetal with linear band touching points at the Fermi level. By combining exact diagonalization, density matrix renormalization grou…
View article: Three-dimensional quantum Hall effect and magnetothermoelectric properties in Weyl semimetals
Three-dimensional quantum Hall effect and magnetothermoelectric properties in Weyl semimetals Open
We numerically study the three-dimensional (3D) quantum Hall effect (QHE) and magnetothermoelectric transport of Weyl semimetals in the presence of disorder. We obtain a bulk picture that the exotic 3D QHE emerges in a finite range of Ferm…
View article: Orbital Chern Insulator and Quantum Phase Diagram of a Kagome Electron System with Half-Filled Flat Bands
Orbital Chern Insulator and Quantum Phase Diagram of a Kagome Electron System with Half-Filled Flat Bands Open
We study the quantum phase diagram of electrons on kagome lattice with half-filled lowest flat bands by considering the antiferromagnetic Heisenberg interaction J, and short-range Coulomb interaction V. In the weak J regime, we identify a …
View article: An $SU(4)$ chiral spin liquid and quantized dipole Hall effect in moir\'e bilayers
An $SU(4)$ chiral spin liquid and quantized dipole Hall effect in moir\'e bilayers Open
Motivated by the recent proposal of realizing an SU(4) Hubbard model on triangular moire superlattices, we present a DMRG study of an $SU(4)$ spin model obtained in the limit of large repulsion for integer filling $\nu_T=1,3$. We retain te…
View article: Quantum Spin Liquid with Emergent Chiral Order in the Triangular-lattice Hubbard Model
Quantum Spin Liquid with Emergent Chiral Order in the Triangular-lattice Hubbard Model Open
The interplay between spin frustration and charge fluctuation gives rise to an exotic quantum state in the intermediate-interaction regime of the half-filled triangular-lattice Hubbard model, while the nature of the state is under debate. …
View article: Microscopic diagnosis of universal geometric responses in fractional quantum Hall liquids
Microscopic diagnosis of universal geometric responses in fractional quantum Hall liquids Open
Topological quantum liquids contain internal degrees of freedom that are\ncoupled to geometric response. Yet, an explicit and microscopic identification\nof geometric response remains difficult. Here, taking notable fractional\nquantum Hal…