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Quantum transport, anomalous dephasing, and spin-orbit coupling in an open ballistic bismuth nanocavity

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Hackens, Benoît [UCL] Minet, JP. Faniel, Sébastien [UCL] Farhi, G. Gustin, C. Bayot, Vincent [UCL]

The phase coherence time tau(phi) and spin-orbit coupling time tau(so) are measured in a bismuth quasiballistic nanocavity and in bismuth thin films using weak antilocalization and universal conductance fluctuations. The cavity is found to be zero dimensional for phase-coherent processes at low temperature. Weak antilocalization seems weakly affected by this drastic reduction of dimensionality. The temperature dependence of tau(phi) is similar in both types of samples, qualitatively consistent with low-energy transfer two-dimensional electron-electron interaction effects as the dominant dephasing mechanism. Strikingly, tau(phi) in the dot is found to be an order-of-magnitude smaller than in the film, and orders-of-magnitude smaller than the theoretical prediction.

Document type Article de périodique (Journal article) – Article de recherche
Access type Accès restreint
Publication date 2003
Language Anglais
Journal information "Physical review. B, Condensed matter and materials physics" - Vol. 67, no. 12 (2004)
Peer reviewed yes
Publisher American Physical Soc (College Pk)
issn 1098-0121
e-issn 1550-235X
Publication status Publié
Affiliation UCL - FSA/ELEC - Département d'électricité
Links
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Bibliographic reference Hackens, Benoît ; Minet, JP. ; Faniel, Sébastien ; Farhi, G. ; Gustin, C. ; et. al. Quantum transport, anomalous dephasing, and spin-orbit coupling in an open ballistic bismuth nanocavity. In: Physical review. B, Condensed matter and materials physics, Vol. 67, no. 12 (2004)
Permanent URL http://hdl.handle.net/2078.1/41092