| Issue |
EPL
Volume 128, Number 4, November 2019
|
|
|---|---|---|
| Article Number | 46001 | |
| Number of page(s) | 3 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/128/46001 | |
| Published online | 20 January 2020 | |
Non-Hermitian quantum networks and configuration entropy: Negative temperatures
Departamento de Física, FACI, Universidad de Tarapacá - Casilla 7-D, Arica, Chile
Received: 25 September 2019
Accepted: 21 November 2019
Using the ordered product for quantum operators, the motion equation in a quantum network with discrete charge is solved exactly. More importantly, by introducing dissipation, the non-Hermitian dynamics is treated, finding the exceptional point explicitly. It defines the energies supporting stationary states which are degenerate. Consequently, the configuration entropy is calculated. Entropy is a decreasing function of energy, a typical characteristic of dual metamaterials, which also sustains negative temperatures. The specific heat is also calculated as being always negative.
PACS: 65.40.gd – Entropy / 63.90.+t – Other topics in lattice dynamics (restricted to new topics in section 63) / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EPLA, 2020
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