Response of open two-band systems to a momentum-carrying single-mode quantized field

TL;DR

This paper investigates how a momentum-carrying single-mode quantum field affects the topological insulator's properties, revealing corrections to Hall conductance and robustness of topological phase transitions, with potential experimental implications.

Contribution

It provides an analytical solution for the ground state response of topological insulators to a single-mode field, highlighting new correction terms and topological phase behavior.

Findings

Hall conductance includes an extra correction term.

Topological phase transition remains robust against environmental effects.

System's topological properties can be controlled experimentally.

Abstract

As a new quantum state, topological insulators have become the focus of condensed matter and material science. The open system research of topological insulators has aroused the interest of many researchers. Recently, many aspects, especially experimental aspects, have been developed rapidly, such as prediction and discovery of many novel quantum effects and applications of topological properties of new materials, but the theoretical research is slightly tough. In this paper, we study the response of topological insulator driven by momentum-carrying single-mode field. We solve the ground state of the system after the addition of a single mode light field with adjustable photon momentum. Specifically, We show that from the analytical solution of hall conductance compared with the closed system, there is an extra correction term, and hall conductance can no longer be expressed in terms of the chern number or the weighted sum of the chern number. Furthermore, the topological properties are analyzed and discussed through the results of different instance with their illustration. Such as, the phase transition point of topological phase is robust to the environment, and the system still has topological phase transition. It is expected to be realized or controlled by experiments, and our observations may contribute to its application and extension in condensed matter physics and quantum statistical physics.