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Quantum Hertz entropy increase in a quenched spin chain

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Abstract

The classical Hertz entropy is the logarithm of the volume of phase space bounded by the constant energy surface; its quantum counterpart, the quantum Hertz entropy, is \(\hat S = k_B \ln \hat N\), where the quantum operator \(\hat N\) specifies the number of states with energy below a given energy eigenstate. It has been recently proved that, when an isolated quantum mechanical system is driven out of equilibrium by an external driving, the change in the expectation of its quantum Hertz entropy cannot be negative, and is null for adiabatic driving. This is in full agreement with the Clausius principle. Here, we test the behavior of the expectation of the quantum Hertz entropy in the case when two identical XY spin chains initially at different temperatures are quenched into a single XY chain. We observed no quantum Hertz entropy decrease. This finding further supports the statement that the quantum Hertz entropy is a proper entropy for isolated quantum systems. We further quantify how far the quenched chain is from thermal equilibrium and the temperature of the closest equilibrium.

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Authors and Affiliations

  1. Institut für Theoretische Physik, Technische Universität Dresden, 01062, Dresden, Germany

    Darshan G. Joshi

  2. Institute of Physics, University of Augsburg, 86153, Augsburg, Germany

    Michele Campisi

Authors
  1. Darshan G. Joshi
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  2. Michele Campisi
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Correspondence to Michele Campisi.

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Joshi, D.G., Campisi, M. Quantum Hertz entropy increase in a quenched spin chain. Eur. Phys. J. B 86, 157 (2013). https://doi.org/10.1140/epjb/e2013-40003-x

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  • DOI: https://doi.org/10.1140/epjb/e2013-40003-x

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