Superluminal Tachyonlike Excitations of Dirac Fermions in a Topological Insulator Junction

Details Superluminal Tachyonlike Excitations of Dirac Fermions in a Topological Insulator Junction Superluminal Tachyonlike Excitations of Dirac Fermions in a Topological Insulator Junction

2012-03-26

arxiv.org/abs/1203.5761v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 4 figures

Scientific paper

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.

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