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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

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OECD FORD obor

10303 - Particles and field physics

Projekt

—

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2020

Kód důvěrnosti údajů

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.

Název periodika

ANNALS OF PHYSICS

ISSN

0003-4916

e-ISSN

1096-035X

Svazek periodika

412

Číslo periodika v rámci svazku

1

Stát vydavatele periodika

US - Spojené státy americké

Počet stran výsledku

18

Strana od-do

168022-168040

Kód UT WoS článku

000509419600016

EID výsledku v databázi Scopus

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