Volume 100, Number 1, October 2012
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||15 October 2012|
Superluminal tachyon-like excitations of Dirac fermions in a topological insulator junction
1 Department of Physics and Astronomy, Georgia State University - Atlanta, GA 30303, USA
2 Department of Physics and Astronomy, University of Manitoba - Winnipeg, Canada R3T 2N2
Received: 10 September 2012
Accepted: 11 September 2012
We have considered a system of two topological insulators and have determined the properties of the surface states at the junction. Here we report that these states, under certain conditions exhibit superluminous (tachyonic) dispersion of the Dirac fermions. Although superluminal excitations are known to exist in optical systems, this is the first demonstration of possible tachyonic excitations in a purely electronic system. The first ever signature of tachyons could therefore be found experimentally in a topological insulator junction.
PACS: 73.20.-r – Electron states at surfaces and interfaces / 73.43.-f – Quantum Hall effects / 03.30.+p – Special relativity
© EPLA, 2012
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.