265 citations · 698 across the 17 of their papers we have counts for
17 papers
Possibility of superradiant phase transitions in coupled two-level atoms
Tao Liu, Yu-Yu Zhang, Qing-Hu Chen +1
Although the oscillator strength sum rule forbids the phase transition in ideal non-interacting two-level atoms systems, we present the possibility of the quantum phase transition…
Parity breaking and scaling behavior in light-matter interaction
T. Liu, M. Feng, W. L. Yang +4
The light-matter interaction described by Rabi model and Jaynes-Cummings (JC) model is investigated by parity breaking as well as the scaling behavior of ground-state population-in…
Exact solvability of the quantum Rabi models within Bogoliubov operators
Qing-Hu Chen, Chen Wang, Shu He +2
The quantum Rabi model can be solved exactly by the Bargmann transformation from real coordinate to complex variable recently [Phys. Rev. Lett. \textbf{107}, 100401 (2011)]. By the…
Unified analytical treatments to qubit-oscillator systems
Shu He, Yu-Yu Zhang, Qing-Hu Chen +3
An effective scheme within two displaced bosonic operators with equal positive and negative displacements is extended to study qubit-oscillator systems analytically in an unified w…
No spin-localization phase transition in the spin-boson model without local field
Tao Liu, Mang Feng, Lei Li +2
We explore the spin-boson model in a special case, i.e., with zero local field. In contrast to previous studies, we find no possibility for quantum phase transition (QPT) happening…
Jaynes-Cummings model: What emerges first beyond the rotating-wave approximation?
Shu He, Qing-Hu Chen, Xue-Zao Ren +2
The Jaynes-Cummings model without the rotating-wave approximation can be solved exactly by extended Swain's ansatz with the conserved parity. The analytical approximations are then…