Stripes and Bubbles in Quantum Hall Systems

The talk summarizes recent publications about NMR and compressibility measurements on GaAs/AlGaAs quantum Hall systems discussing  the determination of the spin texture of the striped phase at half-filled Landau levels and the possible detection of a pinned Wigner lattice in the tails of Landau levels [1,2] . In addition the formation of compressible and incompressible stripes at the boundary of a quantum Hall system and their importance for the current flow will be reviewed since these edge channels play an important role in transport measurements on topological insulators and Aharonov-Bohm experiments and are often misinterpreted.  

[1] Probing the Microscopic Structure of the Striped Phase at Filling Factor 5/2,  

B. Friess, V. Umansky, L. Tieman, K.v.Klitzing and J. Smet, PRL 113, 076803 (published 13.8.2014)

[2] Signatures for Wigner Crystal Formation in the Chemical Potential of a Two-Dimensional Electron System, D. Zhang, X. Huang, W. Dietsche, K.v.Klitzing and J. Smet, PRL 113, 076804 (published 14.8.2014)

Host: Sankar Das Sarma