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Transference of Transport Anisotropy to Composite Fermions
T. Gokmen, Medini Padmanabhan, M. Shayegan
When interacting two-dimensional electrons are placed in a large perpendicular magnetic field, to minimize their energy, they capture an even number of flux quanta and create new p…
Temperature dependence of piezoresistance of composite Fermions with a valley degree of freedom
T. Gokmen, Medini Padmanabhan, M. Shayegan
We report transport measurements of composite Fermions at filling factor in AlAs quantum wells as a function of strain and temperature. In this system the composite Fermion…
Contrast between spin and valley degrees of freedom
T. Gokmen, Medini Padmanabhan, M. Shayegan
We measure the renormalized effective mass (m*) of interacting two-dimensional electrons confined to an AlAs quantum well while we control their distribution between two spin and t…
Fractional Quantum Hall Effect at High Fillings in a Two-subband Electron System
J. Shabani, Y. Liu, M. Shayegan
Magneto-transport measurements in a clean two-dimensional electron system confined to a wide GaAs quantum well reveal that, when the electrons occupy two electric subbands, the seq…
Composite fermion valley polarization energies: Evidence for particle-hole asymmetry
Medini Padmanabhan, Tayfun Gokmen, Mansour Shayegan
In an ideal two-component two-dimensional electron system, particle-hole symmetry dictates that the fractional quantum Hall states around are equivalent to those around $ν…
Ferromagnetic Fractional Quantum Hall States in a Valley-Degenerate Two-Dimensional Electron System
Medini Padmanabhan, T. Gokmen, M. Shayegan
We study a two-dimensional electron system where the electrons occupy two conduction band valleys with anisotropic Fermi contours and strain-tunable occupation. We observe persiste…