20 citations · 50 across the 3 of their papers we have counts for
6 papers
Valley effects on the fractions in an ultrahigh mobility SiGe/Si/SiGe two-dimensional electron system
V. T. Dolgopolov, M. Yu. Melnikov, A. A. Shashkin +3
We observe minima of the longitudinal resistance corresponding to the quantum Hall effect of composite fermions at quantum numbers , 2, 3, 4, and 6 in an ultraclean strongly i…
Metallic state in a strongly interacting spinless two-valley electron system in two dimensions
M. Yu. Melnikov, A. A. Shashkin, V. T. Dolgopolov +4
We have studied the strongly interacting, two-valley two-dimensional (2D) electron system in ultrahigh mobility SiGe/Si/SiGe quantum wells in parallel magnetic fields strong enough…
Fractional Quantum Hall Effect in SiGe/Si/SiGe Quantum Wells in Weak Quantizing Magnetic Fields
V. T. Dolgopolov, M. Yu. Melnikov, A. A. Shashkin +3
We have experimentally studied the fractional quantum Hall effect (FQHE) in SiGe/Si/SiGe quantum wells in relatively weak magnetic fields, where the Coulomb interaction between ele…
Effective g factor of low-density two-dimensional holes in a Ge quantum well
T. M. Lu, C. T. Harris, S. -H. Huang +3
We report measurements of the effective factor of low-density two-dimensional holes in a Ge quantum well. Using the temperature dependence of the Shubnikov-de Haas oscillations…
Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
T. M. Lu, L. A. Tracy, D. Laroche +5
Quantum Hall ferromagnetic transitions are typically achieved by increasing the Zeeman energy through in-situ sample rotation, while transitions in systems with pseudo-spin indices…
Unusual anisotropy of inplane field magnetoresistance in ultra-high mobility SiGe/Si/SiGe quantum wells
M. Yu. Melnikov, V. T. Dolgopolov, A. A. Shashkin +3
We find an unusual anisotropy of the inplane field magnetoresistance in ultra-high mobility SiGe/Si/SiGe quantum wells. The anisotropy depends on the orientation between the inplan…