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Sagnac interference in carbon nanotubes

Bishara, Waheb and Refael, Gil and Bockrath, Marc (2008) Sagnac interference in carbon nanotubes. Physical Review B, 78 (16). Art. No. 165405. ISSN 1098-0121. doi:10.1103/PhysRevB.78.165405.

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The Sagnac interference mode arises when two interfering counterpropogating beams traverse a loop, but with their velocities detuned by a small amount 2u, with vR/L=vF±u. In this paper we perform a perturbative nonequilibrium calculation of Sagnac interference in single-channel wires as well as armchair nanotube loops. We study the dependence of the Sagnac conductance oscillations on temperature and interactions. We find that the Sagnac interference is not destroyed by strong interactions, but becomes weakly dependent on the velocity detuning u. In armchairs nanotubes with typical interaction strength, 0.25<=g<=0.5, we find that the necessary temperature for observing the interference effect, TSAG is also only weakly dependent on the interaction, and is enhanced by a factor of 8 relative to the temperature necessary for observing Fabry-Pérot interference in the same system, TFP.

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Additional Information:© 2008 The American Physical Society. (Received 20 June 2008; revised 17 September 2008; published 6 October 2008) We are indebted to Jinseong Hu, Chetan Nayak, Yuval Oreg, Leonid Pryadko, and Jan von Delft for illuminating discussions. M.B. is grateful for support by the ONR.
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Office of Naval ResearchUNSPECIFIED
Subject Keywords:carbon nanotubes; current fluctuations; electric admittance; Fabry-Perot interferometers; perturbation theory; Sagnac interferometers
Issue or Number:16
Record Number:CaltechAUTHORS:BISprb08c
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:11936
Deposited By: Archive Administrator
Deposited On:11 Oct 2008 05:52
Last Modified:08 Nov 2021 22:23

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