Dresden 2014 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 84: Poster: Electronic structure theory / Carbon (other than graphene) / Si, Ge, and SiC / III-V semiconductors (other than nitrides)
HL 84.14: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Coherent Transport in GaAs/InAs Core/Shell Nanowires — •Patrick Zellekens1,2, Fabian Haas1,2, Tobias Wenz1,2, Natalia Demarina1,2, Torsten Rieger1,2, Mihail Lepsa1,2, Detlev Grützmacher1,2, Hans Lüth1,2, and Thomas Schäpers1,2 — 1Peter Grünberg Institute - 9, Forschungszentrum Jülich, 52425 Jülich, Germany — 2JARA - Fundamentals of Future Information Technology
GaAs/InAs core/shell nanowires are very interesting objects for studying magnetic flux dependent quantum transport phenomena, due to the fact that the low bandgap InAs shell forms a cylindrical tube-like conductor around the high bandgap GaAs core. This allows the emergence of phase coherent transport phenomena, i.e. (h/e) flux-periodic conductance oscillations. In this contribution, we present magneto-transport measurements of GaAs/InAs core/shell nanowires at various temperatures in a magnetic field applied parallel to the wire axis. The magneto conductance of the core/shell nanowires revealed pronounced h/e-periodic oscillations, which can be attributed to electronic transport via angular momentum states. In a more detailed analysis higher harmonic h/2e periodic oscillations were also resolved. In nanowires comprising a small core diameter of 70nm the h/e oscillations are visible at temperatures up to 50 K, indicating a large energetic separation of successive angular momentum states. These findings are supported by gate-dependent universal conductance fluctuation measurements, which show thermal stability of phase coherent transport up to 40 K.