28 citations · 68 across the 14 of their papers we have counts for
14 papers
Qubit parametrization of the variational discrete action theory for the multiorbital Hubbard model
Zhengqian Cheng, Chris A. Marianetti
The variational discrete action theory (VDAT) at \mathcal{N}=3 is a potent tool for accurately capturing Mott and Hund physics at zero temperature in d=\infty at a cost comparable…
Mott transition from the non-analyticity of the one-body reduced density-matrix functional
Zhengqian Cheng, Chris A. Marianetti
One-body reduced density-matrix functional (1RDMF) theory has yielded promising results for small systems such as molecules, but has not addressed quantum phase transitions such as…
Matching Wilson flow time for calculating the topological charge density and the pseudoscalar glueball mass in quenched lattice QCD
Zhen Cheng, Guang-yi Xiong
The matching Wilson flow time for calculating the topological charge density correlator (TCDC) of the gluonic definition by the Wilson flow is analyzed using the matching procedure…
Density-Matrix Mean-Field Theory
Junyi Zhang, Zhengqian Cheng
Mean-field theories have proven to be efficient tools for exploring diverse phases of matter, complementing alternative methods that are more precise but also more computationally…
Magnetism and Metallicity in Moiré Transition Metal Dichalcogenides
Patrick Tscheppe, Jiawei Zang, Marcel Klett +8
The ability to control the properties of twisted bilayer transition metal dichalcogenides in situ makes them an ideal platform for investigating the interplay of strong correlation…
A gauge constrained algorithm of VDAT at for the multi-orbital Hubbard model
Zhengqian Cheng, Chris A. Marianetti
The recently developed variational discrete action theory (VDAT) provides a systematic variational approach to the ground state of the quantum many-body problem, where the quality…
Fractional quantum fields with Le'vy paths
Zheng-Wei Cheng, You-Kai Wang, Xia Wan
We develop a path integral approach to quantum field theory that is defined over the paths of the Le'vy flights possessing a fractal dimension . In standard quantum field…
Precise ground state of multi-orbital Mott systems via the variational discrete action theory
Zhengqian Cheng, Chris A. Marianetti
Determining the ground state of multi-orbital Hubbard models is critical for understanding strongly correlated electron materials, yet existing methods struggle to simultaneously r…
Variational Discrete Action Theory
Zhengqian Cheng, Chris A. Marianetti
Here we propose the Variational Discrete Action Theory (VDAT) to study the ground state properties of quantum many-body Hamiltonians. VDAT is a variational theory based on the sequ…
Foundations of the Variational Discrete Action Theory
Zhengqian Cheng, Chris A. Marianetti
Variational wave functions and Green's functions are two important paradigms for solving quantum Hamiltonians, each having their own advantages. Here we detail the Variational Disc…
The dependence of overlap topological charge density on Wilson mass parameter
Zhen Cheng, Jian-bo Zhang
In this paper, we analyze the dependence of the topological charge density from the overlap operator on the Wilson mass parameter in the overlap kernel by the symmetric multi-probi…
Off-shell effective energy theory: a unified treatment of the Hubbard model from d=1 to d=
Zhengqian Cheng, Chris A. Marianetti
Here we propose an exact formalism, off-shell effective energy theory (OET), which provides a thermodynamic description of a generic quantum Hamiltonian. The OET is based on a part…
A group theoretical approach to computing phonons and their interactions
Lyuwen Fu, Mordechai Kornbluth, Zhengqian Cheng +1
Here we present four independent advances which facilitate the computation of phonons and their interactions from first-principles. First, we implement a group-theoretical approach…
Heat Superconductivity
Junren Shi, Zhengqian Cheng
Electrons/atoms can flow without dissipation at low temperature in superconductors/superfluids. The phenomenon known as superconductivity/superfluidity is one of the most important…