Low-temperature pseudo-phase-transition in an extended Hubbard diamond chain
Onofre Rojas1, S M de Souza1, Jordana Torrico2
1Departamento de Física, Universidade Federal de Lavras, 37200-900 Lavras, Minas Gerais, Brazil.
Physical Review. E
|May 19, 2021
Summary
This study reveals a pseudo-transition in the extended Hubbard diamond chain model at low temperatures. Physical quantities show sharp changes, mimicking first and second-order phase transitions with specific pseudo-critical exponents.
Area of Science:
- Condensed Matter Physics
- Quantum Mechanics
- Statistical Mechanics
Background:
- The extended Hubbard diamond chain model is a complex system for studying particle interactions.
- Understanding phase transitions in such models is crucial for materials science.
Purpose of the Study:
- To rigorously investigate the pseudo-transition effect in the extended Hubbard diamond chain model.
- To analyze the behavior of physical quantities and determine pseudo-critical exponents.
Main Methods:
- Analysis of physical quantities including internal energy, entropy, correlation length, and specific heat.
- Investigation of electron density and isothermal compressibility.
- Calculation of pseudo-critical exponents (ν and α).
Main Results:
- The model exhibits a pseudo-transition in the low-temperature regime.
- Internal energy and entropy show jumps resembling first-order phase transitions.
- Correlation length and specific heat display sharp peaks akin to second-order phase transitions.
- Pseudo-critical exponents ν=1 and α=3 were determined.
Conclusions:
- The extended Hubbard diamond chain model demonstrates a unique pseudo-transition phenomenon.
- This phenomenon closely mimics both first and second-order phase transitions.
- The study provides insights into the critical behavior of quantum systems.
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