265 citations · 2.1k across the 75 of their papers we have counts for
9 papers · 1 filter
Large-N scaling behavior of the ground-state energy and fidelity in the Dicke Model
Tao Liu, Yu-Yu Zhang, Qing-Hu Chen +1
Within the numerically exact solution to the Dicke model proposed previously, we study the quantum criticality in terms of the ground-state (GS) energy, fidelity, and the order par…
Nernst effect in the two-dimensional XY model
Qing-Hu Chen
We calculate the Nernst signal directly in the phenomenological two-dimensional XY model. The obtained numerical results are consistent with the experimental observations in some h…
Accurate numerical solution to the finite-size Dicke model
Qing-Hu Chen, Yu-Yu Zhang, Tao Liu +1
By using extended bosonic coherent states, a new technique to solve the Dicke model exactly is proposed in the numerical sense. The accessible system size is two orders of magnitud…
Ground-state properties of the two-site Hubbard-Holstein model: an exact solution
Yu-Yu Zhang, Tao Liu, Qing-Hu Chen +2
We revisit the two-site Hubbard-Holstein model by using extended phonon coherent states. The nontrivial singlet bipolaron is studied exactly in the whole coupling regime. The groun…
Quantum phase transition in the one-dimensional period-two and uniform compass model
Ke-Wei Sun, Yu-Yu Zhang, Qing-Hu Chen
Quantum phase transition in the one-dimensional period-two and uniform quantum compass model are studied by using the pseudo-spin transformation method and the trace map method. Th…
Phase transition in site-diluted Josephson junction arrays: A numerical study
Jian-Ping Lv, Huan Liu, Qing-Hu Chen
We numerically investigate the intriguing effects produced by random percolative disorder in two-dimensional Josephson-junction arrays. By dynamic scaling analysis, we evaluate cri…