Two-dimensional Klein tunneling for massive Dirac fermions with a defined helicity

Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216305%3A26620%2F20%3APU135096" target="_blank" >RIV/00216305:26620/20:PU135096 - isvavai.cz</a>
Result on the web
<a href="https://www.sciencedirect.com/science/article/pii/S0003491619302775?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0003491619302775?via%3Dihub</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1016/j.aop.2019.168022" target="_blank" >10.1016/j.aop.2019.168022</a>

Result language
angličtina
Original language name
Two-dimensional Klein tunneling for massive Dirac fermions with a defined helicity
Original language description
The main goal of this work is to study the role played by the helicity in the two-dimensional Klein tunneling for massive Dirac fermions. To this end, we consider the cases in which massive Dirac fermions with a defined helicity are scattered by step and barrier electrostatic potentials. For each potential, we first calculate the contributions of fermion states with conserved and inverted helicity to the reflection and transmission coefficients, analyzing how the potential (V0), fermion’s mass, energy (E) and angle of incidence affect them. In the step potential case, we find that the transmission probability for fermion states with inverted helicity is small when V0<E, but becomes dominant when V0>E. In the barrier potential case, this probability is always null. This behavior is explained by the breaking of the helicity conservation by the mass term, allowing the reflection of states with inverted helicity in both potentials, and transmission of inverted helicity states only in the step potential. Finally, we give some insights on the consequences of our results in materials with Dirac-like quasiparticles, such as graphene, topological insulators and Weyl semimetals.
Czech name
—
Czech description
—

Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
—
OECD FORD branch
10303 - Particles and field physics

Project
—
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year
2020
Confidentiality
C - Předmět řešení projektu podléhá obchodnímu tajemství (§ 504 Občanského zákoníku), ale název projektu, cíle projektu a u ukončeného nebo zastaveného projektu zhodnocení výsledku řešení projektu (údaje P03, P04, P15, P19, P29, PN8) dodané do CEP, jsou upraveny tak, aby byly zveřejnitelné.

Similar results(10)