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Thermodynamic analysis of a long-range interacting spin system

Zhen-Yu Yang

School of Physics, Southeast University, Nanjing 211189, China

Duke Kunshan University, Kunshan 215325, China

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and

Ji-Xuan Hou

http://orcid.org/0000-0002-7844-5363

School of Physics, Southeast University, Nanjing 211189, China

E-mail Address: jxhou@seu.edu.cn

Corresponding author.

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https://doi.org/10.1142/S0217984919500726Cited by:14 (Source: Crossref)

Abstract

A long-range interacting Fermi chain placed in the uniform and the staggered magnetic field is studied via the micro-canonical approach. The relation between the entropy and the energy of the system is obtained by counting the number of microscopic states. We find that this system is non-ergodic and can exhibit first-order phase transition, second-order phase transition, or both. The microcanonical ensemble predicts negative specific heat regions and temperature jumps. Moreover, the global phase diagram of the system is constructed.

Keywords:

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