Spin–orbit interaction and weak localization in heterostructures

Spin-orbit interaction in InAs/GaSb heterostructures quantified by weak antilocalization

F. Herling,1,2 C. Morrison,1,3 C. S. Knox,1,4 S. Zhang,5 O. Newell,3 M. Myronov,3 E. H. Linfield,4 and C. H. Marrows1 1School of Physics and Astronomy, University of Leeds, Leeds, LS2 9TJ, United Kingdom 2Novel Materials Group, Institut für Physik, Humboldt-Universität zu Berlin, 12489 Berlin, Germany 3Department of Physics, University of Warwick, Coventry, CV4 7AL, United Kingdom 4School of El...

Competing weak localization and weak antilocalization in ultrathin topological insulators.

We demonstrate evidence of a surface gap opening in topological insulator (TI) thin films of (Bi(0.57)Sb(0.43))(2)Te(3) below six quintuple layers through transport and scanning tunneling spectroscopy measurements. By effective tuning the Fermi level via gate-voltage control, we unveil a striking competition between weak localization and weak antilocalization at low magnetic fields in nonmagnet...

Energy relaxation probed by weak antilocalization measurements in GaN heterostructures

Weak localization in bilayer graphene.

We have performed the first experimental investigation of quantum interference corrections to the conductivity of a bilayer graphene structure. A negative magnetoresistance--a signature of weak localization--is observed at different carrier densities, including the electroneutrality region. It is very different, however, from the weak localization in conventional two-dimensional systems. We sho...

Weak localization and integrability in ballistic cavities.

We demonstrate the existence of an interference contribution to the average magnetoconductance, G(B), of ballistic cavities and use it to test the semiclassical theory of quantum billiards. G(B) is qualitatively different for chaotic and regular cavities, an effect explained semiclassically by the differing classical distribution of areas. The magnitude of G(B) is poorly explained by the semicl...