Related Experiment Video
Updated: Mar 2, 2026

Measurement of Coherence Decay in GaMnAs Using Femtosecond Four-wave Mixing
Published on: December 3, 2013
Mechanism for Hall conductance of two-band systems against decoherence
H Z Shen1,2, Hong Li1, Y F Peng1
1Center for Quantum Sciences and School of Physics, Northeast Normal University, Changchun 130024, China.
Abstract:
The Kubo formula expresses a linear response of the quantum system to weak classical fields. Previous studies showed that the environment degrades the quantum Hall conductance. By studying the dynamics of dissipative two-band systems, in this paper we find that the formation of system-environment bound states is responsible for the Hall conductance immune to the effect of the environment. The bound states can form only when the system-environment couplings are below a threshold. Our results may be of both theoretical and experimental interest in exploring dissipative topological insulators in realistic situations, and may open new perspectives for designing active quantum Hall devices working in realistic environments.
Related Concept Videos
The Hall Effect
Band Theory
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
Debye–Huckel–Onsager Conductance Equation
The de Broglie Wavelength
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹H NMR: Interpreting Distorted and Overlapping Signals
As Δν decreases and the signals move closer, the doublets appear increasingly distorted. The intensities of the inner lines increase at the cost of those of the outer lines as the signals are...

