We studied weak localization (WL) and antilocalization (WAL) in graphene at temperatures between 0.3 K and 15 K. At low carrier density, we observed a transition fromWL toWAL driven by the increasing of the magnetic field while at high carrier density, WAL was suppressed as a consequence of trigonal warping of the conical energy bands.We analyzed the magnetic-field-driven WL-WAL transition, evaluating the relative strengths of the various elastic-scattering mechanisms and estimating the decoherence lengths and rates as a function of temperature, using an alternative method with respect to previously reported studies. We relate the small values of lφ here reported, confirmed by a complementary analysis of universal conductance fluctuations, to an effective breaking of time-reversal symmetry due to the slowly varying disorder of the long-range type.

Quantum interference corrections to magnetoconductivity in graphene

PEZZINI, SERGIO;BELLANI, VITTORIO
2012-01-01

Abstract

We studied weak localization (WL) and antilocalization (WAL) in graphene at temperatures between 0.3 K and 15 K. At low carrier density, we observed a transition fromWL toWAL driven by the increasing of the magnetic field while at high carrier density, WAL was suppressed as a consequence of trigonal warping of the conical energy bands.We analyzed the magnetic-field-driven WL-WAL transition, evaluating the relative strengths of the various elastic-scattering mechanisms and estimating the decoherence lengths and rates as a function of temperature, using an alternative method with respect to previously reported studies. We relate the small values of lφ here reported, confirmed by a complementary analysis of universal conductance fluctuations, to an effective breaking of time-reversal symmetry due to the slowly varying disorder of the long-range type.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11571/430965
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