Detail publikačního výsledku

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

NAVARRO GIRALDO, J.; QUIMBAY, C.

Originální název

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

Anglický název

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

Druh

Článek WoS

Originální abstrakt

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 V0E. 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.

Anglický abstrakt

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 V0E. 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.

Klíčová slova

Klein tunneling; Dirac equation; Tunnel junctions

Klíčová slova v angličtině

Klein tunneling; Dirac equation; Tunnel junctions

Autoři

NAVARRO GIRALDO, J.; QUIMBAY, C.

Rok RIV

2021

Vydáno

08.01.2020

Nakladatel

Elsevier

Místo

Annals of Physics

ISSN

0003-4916

Periodikum

Annals of Physics

Svazek

412

Číslo

1

Stát

Spojené státy americké

Strany od

168022

Strany do

168040

Strany počet

18

URL

https://www.sciencedirect.com/science/article/pii/S0003491619302775?via%3Dihub

BibTex

@article{BUT161714,
  author="NAVARRO GIRALDO, J. and QUIMBAY, C.",
  title="Two-dimensional Klein tunneling for massive Dirac fermions with a defined helicity",
  journal="Annals of Physics",
  year="2020",
  volume="412",
  number="1",
  pages="168022--168040",
  doi="10.1016/j.aop.2019.168022",
  issn="0003-4916",
  url="https://www.sciencedirect.com/science/article/pii/S0003491619302775?via%3Dihub"
}