Persistent currents in Dirac fermion rings

Doru Sticlet

doi:10.1103/PhysRevB.88.205401

2013-11-04

Doru Sticlet *

Balázs Dóra

J. Cayssol

DOI：10.1103/PhysRevB.88.205401

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摘要

En 中文

The persistent current in strictly one-dimensional Dirac systems is investigated within two different models, defined in the continuum and on a lattice, respectively. The object of the study is the effect of a single magnetic or nonmagnetic impurity in the two systems. In the continuum Dirac model, an analytical expression for the persistent current flowing along a ring with a single delta-like magnetic impurity is obtained after regularization of the unbounded negative energy states. The predicted decay of the persistent current agrees with the lattice simulations. The results are generalized to finite temperatures. To realize a single Dirac massless fermion, the lattice model breaks the time-reversal symmetry, and in contrast with the continuum model, a pointlike nonmagnetic impurity can lead to a decay in the persistent current.

Keyword:

TOPOLOGICAL INSULATORS

ELECTRONIC-PROPERTIES

JOSEPHSON CURRENT

MESOSCOPIC RINGS

SCATTERING

PARITY

SINGLE

STATES

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期刊

Physical Review B

IF:

3.7

论文数:

15.4W

被引数:

41.0W

机构

universite de bordeaux

学者数:

2.7W

论文数: 1.9W

被引数: 37

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