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Regensburg 2013 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Topological Insulators 4 (jointly with DS, HL, MA, and O)

TT 61.6: Vortrag

Donnerstag, 14. März 2013, 16:45–17:00, H18

Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire — •Joseph Dufouleur1, Louis Veyrat1, Andreas Teichgräber1, Stephan Neuhaus1, Christian Nowka1, Silke Hampel1, J érôme Cayssol2,3, Joachim Schumann1, Barbara Eichler1, Oliver Schmidt1, Bernd Büchner1, and Romain Giraud1,41Leibniz Institute for Solid State and Materials Research, IFW Dresden, 01171 Dresden, Germany — 2LOMA, University Bordeaux 1, F-33045 Talence, France — 3Max-Planck-Institut für Physik Komplexer Systeme, Nöthnitzer Str. 38, 01187 Dresden, Germany — 4CNRS - Laboratoire de Photonique et de Nanostructures, Route de Nozay, 91460 Marcoussis, France

Quantum coherent transport of Dirac fermions in a mesoscopic nanowire of the 3D topological insulator Bi2Se3 is studied in the weak-disorder limit. At very low temperatures, many harmonics are evidenced in the Fourier transform of Aharonov-Bohm oscillations, revealing the long phase-coherence length of surface states. Remarkably, from their exponential temperature dependence, we infer an unusual 1/T power law for the phase coherence length Lϕ(T). This decoherence is typical for quasi-ballistic fermions weakly coupled to the dynamics of their environment.

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