Repositorio UFRO · Omeka S

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

Primer Autor	Bezerra, Nilberto
Co-autores	Alves, Van Sergio Nascimento, Leandro O. Fernandez, Luis
Título	Effects of the two-dimensional Coulomb interaction in both Fermi velocity and energy gap for Dirac-like electrons at finite temperature
Editorial	AMER PHYSICAL SOC
Revista	PHYSICAL REVIEW D
Lenguaje	en
Resumen	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.
Fecha Publicación	2023
Tipo de Recurso	artículo original
doi	10.1103/PhysRevD.108.056012
Formato Recurso	PDF
Palabras Claves	Effective field theory Feynman diagrams Finite temperature field theory Perturbation theory Quantum field theory
Ubicación del archivo	http://dx.doi.org/10.1103/PhysRevD.108.056012
Categoría OCDE	Astronomía y Astrofísica Física
Materias	Teoría de campo efectiva diagramas de Feynman Teoría de campos de temperaturas finitas Teoría de la perturbación Teoría cuántica de campos
Identificador del recurso (Mandatado-único)	artículo original
Versión del recurso (Recomendado-único)	versión publicada
Derechos de acceso	metadata
Access Rights	metadata
Id de Web of Science	WOS:001103494400003
ISSN	2470-0010
Tipo de ruta	verde
Categoría WOS	Astronomía y Astrofísica Física