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Title: Temperature and voltage measurement in quantum systems far from equilibrium

Abstract

In this work, we show that a local measurement of temperature and voltage for a quantum system in steady state, arbitrarily far from equilibrium, with arbitrary interactions within the system, is unique when it exists. This is interpreted as a consequence of the second law of thermodynamics. We further derive a necessary and sufficient condition for the existence of a solution. In this regard, we find that a positive temperature solution exists whenever there is no net population inversion. However, when there is a net population inversion, we may characterize the system with a unique negative temperature. Voltage and temperature measurements are treated on an equal footing: They are simultaneously measured in a noninvasive manner, via a weakly coupled thermoelectric probe, defined by requiring vanishing charge and heat dissipation into the probe. Our results strongly suggest that a local temperature measurement without a simultaneous local voltage measurement, or vice versa, is a misleading characterization of the state of a nonequilibrium quantum electron system. These results provide a firm mathematical foundation for voltage and temperature measurements far from equilibrium.

Authors:
 [1];  [1]
  1. Univ. of Arizona, Tucson, AZ (United States)
Publication Date:
Research Org.:
Univ. of Arizona, Tucson, AZ (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1535779
Alternate Identifier(s):
OSTI ID: 1329348
Grant/Contract Number:  
SC0006699
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 15; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; nonequilibrium & irreversible thermodynamics; open quantum systems; quantum thermodynamics; quantum transport

Citation Formats

Shastry, Abhay, and Stafford, Charles A. Temperature and voltage measurement in quantum systems far from equilibrium. United States: N. p., 2016. Web. doi:10.1103/physrevb.94.155433.
Shastry, Abhay, & Stafford, Charles A. Temperature and voltage measurement in quantum systems far from equilibrium. United States. https://doi.org/10.1103/physrevb.94.155433
Shastry, Abhay, and Stafford, Charles A. Wed . "Temperature and voltage measurement in quantum systems far from equilibrium". United States. https://doi.org/10.1103/physrevb.94.155433. https://www.osti.gov/servlets/purl/1535779.
@article{osti_1535779,
title = {Temperature and voltage measurement in quantum systems far from equilibrium},
author = {Shastry, Abhay and Stafford, Charles A.},
abstractNote = {In this work, we show that a local measurement of temperature and voltage for a quantum system in steady state, arbitrarily far from equilibrium, with arbitrary interactions within the system, is unique when it exists. This is interpreted as a consequence of the second law of thermodynamics. We further derive a necessary and sufficient condition for the existence of a solution. In this regard, we find that a positive temperature solution exists whenever there is no net population inversion. However, when there is a net population inversion, we may characterize the system with a unique negative temperature. Voltage and temperature measurements are treated on an equal footing: They are simultaneously measured in a noninvasive manner, via a weakly coupled thermoelectric probe, defined by requiring vanishing charge and heat dissipation into the probe. Our results strongly suggest that a local temperature measurement without a simultaneous local voltage measurement, or vice versa, is a misleading characterization of the state of a nonequilibrium quantum electron system. These results provide a firm mathematical foundation for voltage and temperature measurements far from equilibrium.},
doi = {10.1103/physrevb.94.155433},
journal = {Physical Review B},
number = 15,
volume = 94,
place = {United States},
year = {Wed Oct 19 00:00:00 EDT 2016},
month = {Wed Oct 19 00:00:00 EDT 2016}
}

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Works referencing / citing this record:

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