Repositorio
Institucional

Bezerra, Nilberto

Alves, Van Sergio

Nascimento, Leandro O.

Fernandez, Luis

Effects of the two-dimensional Coulomb interaction in both Fermi velocity and energy gap for Dirac-like electrons at finite temperature

AMER PHYSICAL SOC

PHYSICAL REVIEW D

en

We describe both the Fermi velocity and the mass renormalization due to the two-dimensional Coulomb interaction in the presence of a thermal bath. To achieve this, we consider an anisotropic version of pseudoquantum electrodynamics, within a perturbative approach in the fine-structure constant alpha. Thereafter, we use the so-called imaginary-time formalism for including the thermal bath. In the limit T -> 0, we calculate the renormalized mass m(R) (p) and compare this result with the experimental findings for the energy band gap in monolayers of transition metal dichalcogenides, namely, WSe2 and MoS2. In these materials, the quasiparticle excitations behave as massive Dirac-like particles in the low-energy limit, hence, its mass is related to the energy band gap of the material. In the low-temperature limit T << v(F)p, where v(F)p is taken as the Fermi energy, we show that m(R) (p) decreases linearly on the temperature, i.e., m(R) (p, T) - m(R) (p, T -> 0) approximate to -A(alpha)T thorn O(T-3), where A(alpha) is a positive constant. On the other hand, for the renormalized Fermi velocity, we find that v(F)(R)(p, T) - v(F)(R)(p, T -> 0) approximate to -B alpha T3 + O(T-5), where B-alpha is a positive constant. We also perform numerical tests which confirm our analytical results.

2023

artículo original

10.1103/PhysRevD.108.056012

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Effective field theory

Feynman diagrams

Finite temperature field theory

Perturbation theory

Quantum field theory

Astronomía y Astrofísica

​​Física

Teoría de campo efectiva

diagramas de Feynman

Teoría de campos de temperaturas finitas

Teoría de la perturbación

Teoría cuántica de campos

artículo original

versión publicada

metadata

metadata

WOS:001103494400003

2470-0010

verde

Astronomía y Astrofísica

​​Física