265 citations · 2.1k across the 75 of their papers we have counts for
4 papers · 1 filter
Improved Silbey-Harris polaron ansatz for the spin-boson model
Shu He, Liwei Duan, Qing-Hu Chen
In this paper, the well-known Silbey-Harris (SH) polaron ansatz for the spin-boson model is improved by adding orthogonal displaced Fock states. The obtained results for the ground…
Quantum phase transitions of the spin-boson model within multi-coherent-states
Liwei Duan, Shu He, Qing-Hu Chen
A variational approach based on the multi-coherent-state ansatz with asymmetric parameters is employed to study the ground state of the spin-boson model. Without any artificial app…
Two-species hard-core bosons on the triangular lattice: A quantum Monte Carlo study
Jian-Ping Lv, Qing-Hu Chen, Youjin Deng
Using worm-type quantum Monte Carlo simulations, we investigate bosonic mixtures on the triangular lattice of two species of bosons, which interact via nearest-neighbour intraspeci…
Quantum Phase Transition in the Sub-Ohmic Spin-Boson Model: Extended Coherent-state Approach
Yu-Yu Zhang, Qing-Hu Chen, Ke-Lin Wang
We propose a general extended coherent state approach to the qubit (or fermion) and multi-mode boson coupling systems. The application to the spin-boson model with the discretizati…