126 citations · 1k across the 29 of their papers we have counts for
24 papers · 1 filter
Natural orbitals renormalization group approach to a spin-1/2 impurity interacting with two helical liquids
Ru Zheng, Rong-Qiang He, Zhong-Yi Lu
Using the natural orbitals renormalization group, we studied the problem of a localized spin- 1/2 impurity coupled to two helical liquids via the Kondo interaction in a quantum spi…
Solving multiorbital dynamical mean-field theory using natural orbitals renormalization group
Jia-Ming Wang, Yin Chen, Yi-Heng Tian +2
The natural orbitals renormalization group (NORG) has previously been proposed as an efficient numerical method for solving zero-temperature properties of multisite and multiorbita…
Magnetic correlation between two local spins in a quantum spin Hall insulator
Ru Zheng, Rong-Qiang He, Zhong-Yi Lu
Two spins located at the edge of a quantum spin Hall insulator may interact with each other via indirect spin-exchange interaction mediated by the helical edge states, namely the R…
An Anderson impurity interacting with the helical edge states in a quantum spin Hall insulator
Ru Zheng, Rong-Qiang He, Zhong-Yi Lu
Using the natural orbitals renormalization group (NORG) method, we have investigated the screening of the local spin of an Anderson impurity interacting with the helical edge state…
Order parameter for the multichannel Kondo model at quantum criticality
Ru Zheng, Rong-Qiang He, Zhong-Yi Lu
A multichannel Kondo model, where two or more equivalent but independent channels of electrons compete to screen a spin-1/2 impurity, shows overcompensation of the impurity spin, l…
Deconfined Quantum Phase Transition of a Higher-Order Symmetry-Protected Topological State
Chen Peng, Long Zhang, Zhong-Yi Lu
A higher-order (HO) symmetry-protected topological (SPT) state can be realized in a plaquette-modulated square lattice antiferromagnet, which hosts a spin- degenerate mode on…
Combined spontaneous symmetry-breaking and symmetry-protected topological order from cluster charge interaction
Chen Peng, Rong-Qiang He, Yuan-Yao He +1
The study of symmetry-protected topological states in presence of electron correlations has recently aroused great interest as rich and exotic phenomena can emerge. Here, we report…
Correlation Effects in Quadrupole Insulators: a Quantum Monte Carlo Study
Chen Peng, Rong-Qiang He, Zhong-Yi Lu
The quadrupole insulator, a high-order topological insulator, with on-site Hubbard interaction is numerically studied by large-scale projector quantum Monte Carlo (PQMC) simulation…
Finite-temperature Auxiliary-Field Quantum Monte Carlo: Self-Consistent Constraint and Systematic Approach to Low Temperatures
Yuan-Yao He, Mingpu Qin, Hao Shi +2
We describe an approach for many-body calculations with a finite-temperature, grand canonical ensemble formalism using auxiliary-field quantum Monte Carlo (AFQMC) with a self-consi…
Natural orbitals renormalization group approach to a Kondo singlet
Ru Zheng, Rong-Qiang He, Zhong-Yi Lu
A magnetic impurity embedded in a metal host is collectively screened by a cloud of conduction electrons to form a Kondo singlet below a characteristic energy scale , the Kond…
Dynamical Generation of Topological Masses in Dirac Fermions
Yuan-Yao He, Xiao Yan Xu, Kai Sun +3
We report discovery of a topological Mott insulator in strongly-correlated Dirac semimetals. Such an interaction-driven topological state has been theoretically proposed but not ye…
Duality between the deconfined quantum-critical point and the bosonic topological transition
Yan Qi Qin, Yuan-Yao He, Yi-Zhuang You +5
Recently significant progress has been made in -dimensional conformal field theories without supersymmetry. In particular, it was realized that different Lagrangians may be…
Visualizing a Bosonic Symmetry Protected Topological Phase in an Interacting Fermion Model
Han-Qing Wu, Yuan-Yao He, Yi-Zhuang You +5
Symmetry protected topological (SPT) phases in free fermion and interacting bosonic systems have been classified, but the physical phenomena of interacting fermionic SPT phases hav…
Quantum critical point of Dirac fermion mass generation without spontaneous symmetry breaking
Yuan-Yao He, Han-Qing Wu, Yi-Zhuang You +3
We study a lattice model of interacting Dirac fermions in dimension space-time with an SU(4) symmetry. While increasing interaction strength, this model undergoes a {\it co…
Diagnosis of interaction-driven topological phase via exact diagonalization
Han-Qing Wu, Yuan-Yao He, Chen Fang +2
We propose a general scheme for diagnosing interaction-driven topological phases in the weak interaction regime using exact diagonalization (ED). The scheme comprises the analysis…
Topological invariants for interacting topological insulators: II. Breakdown of the Green's function formalism
Yuan-Yao He, Han-Qing Wu, Zi Yang Meng +1
Topological phase transitions in free fermion systems can be characterized by closing of single-particle gap and change in topological invariants. However, in the presence of elect…
Topological invariants for interacting topological insulators: I. Efficient numerical evaluation scheme and implementations
Yuan-Yao He, Han-Qing Wu, Zi Yang Meng +1
The aim of this series of two papers is to discuss topological invariants for interacting topological insulators (TIs). In the first paper (I), we provide a paradigm of efficient n…
Bona fide interaction-driven topological phase transition in correlated SPT states
Yuan-Yao He, Han-Qing Wu, Yi-Zhuang You +3
It is expected that the interplay between non-trivial band topology and strong electron correlation will lead to very rich physics. Thus a controlled study of the competition betwe…
Correlated Dirac semimetal by periodized cluster dynamical mean-field theory
Qing-Xiao Li, Rong-Qiang He, Zhong-Yi Lu
The periodized cluster dynamical mean-field theory (PCDMFT) combined with exact diagonalization as impurity solver has been applied to the half-filled standard Hubbard model on the…
Quantum Monte Carlo study of strange correlator in interacting topological insulators
Han-Qing Wu, Yuan-Yao He, Yi-Zhuang You +3
Distinguishing the nontrivial symmetry-protected topological (SPT) phase from the trivial insulator phase in the presence of electron-electron interaction is an urgent question to…
Natural Orbitals Renormalization Group Approach to the Two-Impurity Kondo Critical Point
Rong-Qiang He, Jianhui Dai, Zhong-Yi Lu
The problem of two magnetic impurities in a normal metal exposes the two opposite tendencies in the formation of a singlet ground state, driven respectively by the single-ion Kondo…
Direct observation of fragile Mott insulators on plaquette Hubbard lattices
Han-Qing Wu, Rong-Qiang He, Zi Yang Meng +1
Employing extensive cellular dynamical mean-field theory (CDMFT) calculations with exact diagonalization impurity solver, we investigate the ground state phase diagrams and non-mag…
Quantum Renormalization Groups Based on Natural Orbitals
Rong-Qiang He, Zhong-Yi Lu
We propose a new concept upon the renormalization group (RG) procedure for an interacting many-electron correlated system in the framework of natural orbitals, and formulate an alg…
Cluster dynamical mean field theory of quantum phases on a honeycomb lattice
Rong-Qiang He, Zhong-Yi Lu
We have studied the ground state of the half-filled Hubbard model on a honeycomb lattice by performing the cluster dynamical mean field theory calculations with exact diagonalizati…