VietNam 2013 

IXth Rencontres du Vietnam
Quy-Nhon, August 4-10, 2013

 QNplage

 Nanophysics: from fundamentals to applications

(the return)

 

Thursday 8
Topological Insulators

› 15:50 - 16:10 (20min)
Quasi-ballistic transport of Dirac fermions in a Bi2Se3 nanowire
Joseph Dufouleur  1, *@  , Louis Veyrat  1@  , Teichgräber Andreas  1@  , Neuhaus Stephan  1@  , Nowka Christian  1@  , Hampel Silke  1@  , Cayssol Jérôme  2, 3@  , Schumann Joachim  1@  , Eichler Barbara  1@  , Oliver Schmidt  1@  , Bernd Büchner  1@  , Romain Giraud  1, 4@  
1 : Leibniz Institute for Solid State and Materials Research  (IFW Dresden)  -  Website
D-01171 Dresden -  Germany
2 : Max-Planck-Institut für Physik Komplexer Systeme  (MPIPKS Dresden)
Nöthnitzer Str. 38 D-01187 Dresden, Germany -  Germany
3 : Laboratoire Ondes et Matière d'Aquitaine  (LOMA Bordeaux)
Université Sciences et Technologies - Bordeaux I
LOMA Université Bordeaux 1 F-33045 Talence -  France
4 : Laboratoire de photonique et de nanostructures  (LPN)
CNRS : UPR20
Route de Nozay 91460 MARCOUSSIS -  France
* : Corresponding author

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 L_phi (T ). This decoherence is typical
for quasi-ballistic fermions weakly coupled to the dynamics of their environment.



  • Other
Online user: 1 RSS Feed