Physics – Condensed Matter – Mesoscale and Nanoscale Physics
Scientific paper
2007-11-05
Phys. Rev. B 77, 125312 (2008)
Physics
Condensed Matter
Mesoscale and Nanoscale Physics
8 pages, 6 figures;
Scientific paper
10.1103/PhysRevB.77.125312
We present a comprehensive study of the low-field magnetoresistance in carbon doped p-type GaAs/AlGaAs heterostructures aiming at the investigation of spin-orbit interaction effects. The following signatures of exceptionally strong spin-orbit interactions are simultaneously observed: a beating in the Shubnikov-de Haas oscillations, a classical positive magnetoresistance due to the presence of the two spin-split subbands, and a weak anti-localization dip in the magnetoresistance. The spin-orbit induced splitting of the heavy hole subband at the Fermi level is determined to be around 30% of the total Fermi energy. The phase coherence length of holes of around 2.5 $\mu$m at a temperature of 70 mK, extracted from weak anti-localization measurements, is promissing for the fabrication of phase-coherent p-type nanodevices.
Ensslin Klaus
Grbic Boris
Ihn Thomas
Leturcq Renaud
Reuter Dirk
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