Geometric magnetism in open quantum systems

Abstract

An isolated classical chaotic system, when driven by the slow change of several parameters, responds with two reaction forces: geometric friction and geometric magnetism. By using the theory of quantum fluctuation relations we show that this holds true also for open quantum systems, and provide explicit expressions for those forces in this case. This extends the concept of Berry curvature to the realm of open quantum systems. We illustrate our findings by calculating the geometric magnetism of a damped charged quantum harmonic oscillator transported along a path in physical space in presence of a magnetic field and a thermal environment. We find that in this case the geometric magnetism is unaffected by the presence of the heat bath.

7 pages. Signs corrected. v3 Accepted in Phys. Rev. A

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• Geometric optimization of non-equilibrium adiabatic thermal machines and implementation in a qubit system
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• Geometrical torque on magnetic moments coupled to a correlated antiferromagnet