Skip to main content

Lund University Publications

LUND UNIVERSITY LIBRARIES

Dynamic impurities in two-dimensional topological-insulator edge states

Wozny, Simon LU ; Leijnse, Martin LU and Erlingsson, Sigurdur I. (2021) In Physical Review B 104(20).
Abstract

Helical edge states of two-dimensional topological insulators show a gap in the density of states (DOS) and suppressed conductance in the presence of ordered magnetic impurities. Here we will consider the dynamical effects on the DOS and transmission when the magnetic impurities are driven periodically. Using the Floquet formalism and Green's functions, the system properties are studied as a function of the driving frequency and the potential energy contribution of the impurities. We see that increasing the potential part closes the DOS gap for all driving regimes. The transmission gap is also closed, showing a pronounced asymmetry as a function of energy. These features indicate that the dynamical transport properties could yield... (More)

Helical edge states of two-dimensional topological insulators show a gap in the density of states (DOS) and suppressed conductance in the presence of ordered magnetic impurities. Here we will consider the dynamical effects on the DOS and transmission when the magnetic impurities are driven periodically. Using the Floquet formalism and Green's functions, the system properties are studied as a function of the driving frequency and the potential energy contribution of the impurities. We see that increasing the potential part closes the DOS gap for all driving regimes. The transmission gap is also closed, showing a pronounced asymmetry as a function of energy. These features indicate that the dynamical transport properties could yield valuable information about the magnetic impurities.

(Less)
Please use this url to cite or link to this publication:
author
; and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B
volume
104
issue
20
article number
205418
publisher
American Physical Society
external identifiers
  • scopus:85119200969
ISSN
2469-9950
DOI
10.1103/PhysRevB.104.205418
project
Transport in two-dimensional topogical insulator edge states with dynamic impurites
language
English
LU publication?
yes
id
d3c5f1d6-2fcf-4170-aa34-607b647fd2fd
date added to LUP
2022-03-03 08:25:06
date last changed
2023-10-23 05:43:48
@article{d3c5f1d6-2fcf-4170-aa34-607b647fd2fd,
  abstract     = {{<p>Helical edge states of two-dimensional topological insulators show a gap in the density of states (DOS) and suppressed conductance in the presence of ordered magnetic impurities. Here we will consider the dynamical effects on the DOS and transmission when the magnetic impurities are driven periodically. Using the Floquet formalism and Green's functions, the system properties are studied as a function of the driving frequency and the potential energy contribution of the impurities. We see that increasing the potential part closes the DOS gap for all driving regimes. The transmission gap is also closed, showing a pronounced asymmetry as a function of energy. These features indicate that the dynamical transport properties could yield valuable information about the magnetic impurities.</p>}},
  author       = {{Wozny, Simon and Leijnse, Martin and Erlingsson, Sigurdur I.}},
  issn         = {{2469-9950}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{20}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B}},
  title        = {{Dynamic impurities in two-dimensional topological-insulator edge states}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.104.205418}},
  doi          = {{10.1103/PhysRevB.104.205418}},
  volume       = {{104}},
  year         = {{2021}},
}