@article{ISI:000550060900011,
 abstract = {We study ballistic transport across a time-dependent barrier present on
the surface of a three-dimensional topological insulator. We show that
such a barrier can be implemented for Dirac electrons on the surface of
a three-dimensional topological insulator by a combination of a
proximate magnetic material and linearly polarized electromagnetic
radiation. We find that the differential conductance of the system can
be tuned by varying the frequency and amplitude of the radiation and the
energy of an electron incident on the barrier, providing us optical
control on the conductance of such junctions. We first study a
d-function barrier which shows a number of interesting features such as
sharp peaks and dips in the transmission at certain angles of incidence.
Approximate methods for studying the limits of small and large
frequencies are presented. We then study a barrier with a finite width.
This gives rise to some features which are not present for a d-function
barrier, such as regions of both large conductance (resonances) and
small conductance (dips) at certain values of the system parameters. We
present a Floquet perturbation theory which can explain all these
features. Finally, we use a semiclassical approach to study transmission
across a time-dependent barrier and show how this can qualitatively
explain some of the results found in the earlier analysis. We discuss
experiments which can test our theory.},
 article-number = {045419},
 author = {Udupa, Adithi and Sengupta, K. and Sen, Diptiman},
 doi = {10.1103/PhysRevB.102.045419},
 eissn = {2469-9969},
 issn = {2469-9950},
 journal = {PHYSICAL REVIEW B},
 month = {JUL 20},
 number = {4},
 times-cited = {0},
 title = {Electromagnetic control of transport across a barrier on a topological
insulator surface},
 unique-id = {ISI:000550060900011},
 volume = {102},
 year = {2020}
}