Volume 128, Number 4, November 2019
|Number of page(s)||3|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|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
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.