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Rashba effect induced localization in quantum networks

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arxiv cond-mat/0401187 v2 pith:JXLGHQZM submitted 2004-01-12 cond-mat.mes-hall cond-mat.dis-nn

Rashba effect induced localization in quantum networks

Dario Bercioux (1) , Michele Governale (2) , Vittorio Cataudella (1) , Vincenzo Marigliano Ramaglia (1) ((1)Coherentia-INFM , Dipartimento di Scienze Fisiche Universit\`a degli studi ``Federico II'' , Napoli , Italy (2)NEST-INFM , Scuola Normale Superiore
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classification cond-mat.mes-hall cond-mat.dis-nn
keywords effectrashbachainlocalizationquantumconnectedinducednetwork
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study a quantum network extending in one-dimension (chain of square loops connected at one vertex) made up of quantum wires with Rashba spin-orbit coupling. We show that the Rashba effect may give rise to an electron localization phenomenon similar to the one induced by magnetic field. This localization effect can be attributed to the spin precession due to the Rashba effect. We present results both for the spectral properties of the infinite chain, and for linear transport through a finite-size chain connected to leads. Furthermore, we study the effect of disorder on the transport properties of this network.

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