Magnetic-field-induced Fabry-Perot resonances in helical edge states

Soori, Abhiram and Das, Sourin and Rao, Sumathi (2012) Magnetic-field-induced Fabry-Perot resonances in helical edge states. In: Physical Review B: Condensed Matter, 86 (12).

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Abstract

We study electronic transport across a helical edge state exposed to a uniform magnetic ((B) over right arrow) field over a finite length. We show that this system exhibits Fabry-Perot-type resonances in electronic transport. The intrinsic spin anisotropy of the helical edge states allows us to tune these resonances by changing the direction of the (B) over right arrow field while keeping its magnitude constant. This is in sharp contrast to the case of nonhelical one-dimensional electron gases with a parabolic dispersion, where similar resonances do appear in individual spin channels (up arrow and down arrow) separately which, however, cannot be tuned by merely changing the direction of the (B) over right arrow field. These resonances provide a unique way to probe the helical nature of the theory. We study the robustness of these resonances against a possible static impurity in the channel.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter
Publisher:	The American Physical Society
Additional Information:	Copyright for this article is belongs to The American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited:	03 Dec 2012 07:55
Last Modified:	03 Dec 2012 07:55
URI:	http://eprints.iisc.ac.in/id/eprint/45195

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