We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Phase transitions in three-dimensional Dirac semi-metals using Schwinger–Dyson equations.
- Authors
Carrington, Margaret E.; Cowie, Wade N.; Meggison, Brett A.
- Abstract
We study the semi-metal/insulator quantum phase transition in three-dimensional Dirac semi-metals by solving a set of Schwinger–Dyson equations. We study the effect of an anisotropic fermion velocity on the critical coupling of the transition. We consider the influence of several different approximations that are commonly used in the literature and show that results for the critical coupling change considerably when some of these approximations are relaxed. Most importantly, the nature of the dependence of the critical coupling on the anisotropy depends strongly on the approximations that are used for the photon polarization tensor. On the one hand, this means that calculations that include full photon dynamics are necessary to answer even the basic question of whether the critical coupling increases or decreases with anisotropy. On the other hand, our results mean that it is possible that anisotropy could provide a mechanism to promote dynamical gap generation in realistic three-dimensional Dirac semi-metallic materials.
- Subjects
SEMIMETALS; QUANTUM phase transitions; PHASE transitions; POLARIZED photons; CRITICAL velocity; GENERATION gap
- Publication
European Physical Journal B: Condensed Matter, 2023, Vol 96, Issue 10, p1
- ISSN
1434-6028
- Publication type
Article
- DOI
10.1140/epjb/s10051-023-00599-8