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12 papers · 2 filters
Microwave spectroscopic observation of distinct electron solid phases in wide quantum wells
A. T. Hatke, Yang Liu, B. A. Magill +6
In high magnetic fields (), two dimensional electron systems (2DESs) can form a number of phases in which interelectron repulsion plays the central role, since the kinetic energ…
Fermi-Edge Superfluorescence from a Quantum-Degenerate Electron-Hole Gas
J. -H. Kim, G. T. Noe, S. A. McGill +4
We report on the observation of spontaneous bursts of coherent radiation from a quantum-degenerate gas of nonequilibrium electron-hole pairs in semiconductor quantum wells. Unlike…
Acoustoelectric effects in very high-mobility -SiGe/Ge/SiGe heterostructure at low temperatures in high magnetic fields
I. L. Drichko, V. A. Malysh, I. Yu. Smirnov +4
The contactless Surface Acoustic Wave (SAW) technique was implemented to probe the high-frequency (ac) conductivity in a high-mobility -SiGe/Ge/SiGe structure in the integer qua…
Cyclotron resonance of single valley Dirac fermions in gapless HgTe quantum well
J. Ludwig, Yu. B. Vasilyev, N. N. Mikhailov +4
We report on Landau level spectroscopy studies of two HgTe quantum wells (QWs) near or at the critical well thickness, where the band gap vanishes. In magnetic fields up to =16T…
Strain-induced time-reversal odd superconductivity in graphene
Bitan Roy, Vladimir Juricic
Time-reversal symmetry breaking superconductors are exotic phases of matter with fascinating properties, which are, however, encountered rather sparsely. Here we identify the possi…
Bilayer graphene with parallel magnetic field and twisting: Phases and phase transitions in a highly tunable Dirac system
Bitan Roy, Kun Yang
The effective theory for bilayer graphene (BLG), subject to parallel/in-plane magnetic fields, is derived. With a sizable magnetic field the trigonal warping becomes irrelevant, an…