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Optical emission spectroscopy study of competing phases of electrons in the second Landau level
A. L. Levy, U. Wurstbauer, Y. Y. Kuznetsova +6
Quantum phases of electrons in the filling factor range are probed by the weak optical emission from the partially populated second Landau level and spin wave measu…
Wigner crystal in a two-dimensional electron system in the vicinity of filling factor 1/5: Acoustic studies
I. L. Drichko, I. Yu. Smirnov, A. V. Suslov +3
By simultaneous measurements of the attenuation and velocity of surface acoustic waves propagating in proximity to a high-quality GaAs quantum well we study the complex AC conducta…
Nanoscale Mach-Zehnder interferometer with spin-resolved quantum Hall edge states
Biswajit Karmakar, Davide Venturelli, Luca Chirolli +7
We realize a nanoscale-area Mach-Zehnder interferometer with co-propagating quantum Hall spin-resolved edge states and demonstrate the persistence of gate-controlled quantum interf…
Fabrication of Artificial Graphene in a GaAs Quantum Heterostructure
Diego Scarabelli, Sheng Wang, Yuliya Y. Kuznetsova +7
The unusual electronic properties of graphene, which are a direct consequence of its two-dimensional (2D) honeycomb lattice, have attracted a great deal of attention in recent year…
Gapped Excitations of unconventional FQHE states in the Second Landau Level
U. Wurstbauer, A. L. Levy, A. Pinczuk +5
We report the observation of low-lying collective charge and spin excitations in the second Landau level at ν = 2 + 1/3 and also for the very fragile states at ν = 2 + 2/5, 2 + 3/8…
Heterostructure Symmetry and the Orientation of the Quantum Hall Nematic Phases
J. Pollanen, K. B. Cooper, S. Brandsen +3
Clean two-dimensional electron systems in GaAs/AlGaAs heterostructures exhibit anisotropic collective phases, the quantum Hall nematics, at high Landau level occupancy and low temp…