Zobrazeno 1 - 10
of 27
pro vyhledávání: '"Cheng, Zhengqian"'
Autor:
Zhang, Junyi, Cheng, Zhengqian
Mean-field theories have proven to be efficient tools for exploring various phases of matter, complementing alternative methods that are more precise but also more computationally demanding. Conventional mean-field theories often fall short in captur
Externí odkaz:
http://arxiv.org/abs/2401.06236
Autor:
Cheng, Zhengqian, Marianetti, Chris A.
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 of the solution is controlled by an integer $\mathcal{N}$, and increas
Externí odkaz:
http://arxiv.org/abs/2304.14616
Autor:
Tscheppe, Patrick, Zang, Jiawei, Klett, Marcel, Karakuzu, Seher, Celarier, Armelle, Cheng, Zhengqian, Marianetti, Chris A., Maier, Thomas A., Ferrero, Michel, Millis, Andrew J., Schäfer, Thomas
Publikováno v:
Proceedings of the National Academy of Sciences 121, 3 (2024)
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 correlations and geometric frustration. Of particular interest are the low energy
Externí odkaz:
http://arxiv.org/abs/2303.13578
Autor:
Cheng, Zhengqian, Marianetti, Chris A.
Determining the ground state of multi-orbital Hubbard models is critical for understanding strongly correlated electron materials, yet existing methods struggle to simultaneously reach zero temperature and infinite system size. The \textit{de facto}
Externí odkaz:
http://arxiv.org/abs/2206.08433
Autor:
Cheng, Zhengqian
This thesis focuses on developing new approaches to solving the ground state properties of quantum many-body Hamiltonians, and the goal is to develop a systematic approach which properly balances efficiency and accuracy. Two new formalisms are propos
Autor:
Cheng, Zhengqian, Marianetti, Chris A.
Publikováno v:
Phys. Rev. Lett. 126, 206402 (2021)
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 sequential product density matrix (SPD) ansatz, characterized by an intege
Externí odkaz:
http://arxiv.org/abs/2011.14510
Autor:
Cheng, Zhengqian, Marianetti, Chris A.
Publikováno v:
Phys. Rev. B 103, 195138 (2021)
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 Discrete Action Theory (VDAT), which exploits the advantages of both parad
Externí odkaz:
http://arxiv.org/abs/2011.14509
Autor:
Cheng, Zhengqian, Marianetti, Chris A.
Publikováno v:
Phys. Rev. B 101, 081105 (2020)
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 partitioning of the Hamiltonian and a corresponding density matrix ansatz
Externí odkaz:
http://arxiv.org/abs/1911.03102
Publikováno v:
Phys. Rev. B 100, 014303 (2019)
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 to construct the order N Taylor series of a d-dimensional crystal pur
Externí odkaz:
http://arxiv.org/abs/1904.06341
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