Volume 70, Number 5, June 2005
|Page(s)||579 - 585|
|Published online||29 April 2005|
Measurable consequences of the local breakdown of the concept of temperature
Institute of Thechnical Physics, DLR Stuttgart Pfaffenwaldring 38-40, D-70569 Stuttgart, Germany
2 Institute of Theoretical Physics I, University of Stuttgart Pfaffenwaldring 57, D-70550 Stuttgart, Germany
Corresponding author: email@example.com
Accepted: 13 April 2005
Local temperature defined by a local canonical state of the respective subsystem, does not always exist in quantum many-body systems. Here, we give some examples of how this breakdown of the temperature concept on small length scales might be observed in experiments: Measurements of magnetic properties of an anti-ferromagnetic spin-1 chain. We show that those magnetic properties are in fact strictly local. As a consequence, their measurement reveals whether the local (reduced) state can be thermal. If it is, a temperature may be associated to the measurement results, while this would lead to inconsistencies otherwise.
PACS: 05.30.-d – Quantum statistical mechanics / 65.80.+n – Thermal properties of small particles, nanocrystals, nanotubes / 03.67.Mn – Entanglement production, characterization and manipulation
© EDP Sciences, 2005
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