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Phys. Rev. Lett. 95, 226803 (2005) [4 pages]

Quantum Interference of Electrons in a Ring: Tuning of the Geometrical Phase

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R. Capozza1 *, D. Giuliano1,2, P. Lucignano1,3,4, and A. Tagliacozzo1,3
1Dipartimento di Scienze Fisiche Università degli studi di Napoli “Federico II ”, Napoli, Italy
2Dipartimento di Fisica, Università della Calabria and INFN, Gruppo collegato di Cosenza, Arcavacata di Rende I-87036, Cosenza, Italy
3Coherentia CNR-INFM, Monte S.Angelo-via Cintia, I-80126 Napoli, Italy
4SISSA and CNR-INFM Democritos National Simulation Center, Via Beirut 2-4, 34014 Trieste, Italy

Received 11 May 2005; published 23 November 2005

We calculate the oscillations of the dc conductance across a mesoscopic ring, simultaneously tuned by applied magnetic and electric fields orthogonal to the ring. The oscillations depend on the Aharonov-Bohm flux and of the spin-orbit coupling. They result from mixing of the dynamical phase, including the Zeeman spin splitting, and of geometric phases. By changing the applied fields, the geometric phase contribution to the conductance oscillations can be tuned from the adiabatic (Berry) to the nonadiabatic (Ahronov-Anandan) regime. To model a realistic device, we also include nonzero backscattering at the connection between ring and contacts, and a random phase for electron wave function, accounting for dephasing effects.


©2005 The American Physical Society

URL: http://link.aps.org/doi/10.1103/PhysRevLett.95.226803
DOI: 10.1103/PhysRevLett.95.226803
PACS: 73.23.−b, 03.65.Vf, 71.70.Ej, 72.10.−d

* Present address: INFM-S3 e Dipartimento di Fisica, Università di Modena e Reggio Emilia, via Campi 213/A, 41100 Modena, Italy.

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