412 citations · 2.4k across the 64 of their papers we have counts for
51 papers · 1 filter
Stabilization of a two-dimensional quantum electron solid in perpendicular magnetic fields
M. Yu. Melnikov, D. G. Smirnov, A. A. Shashkin +3
We find that the double-threshold voltage-current characteristics in the insulating regime in the ultra-clean two-valley two-dimensional electron system in SiGe/Si/SiGe quantum wel…
Collective depinning and sliding of a quantum Wigner solid in a 2D electron system
M. Yu. Melnikov, A. A. Shashkin, S. -H. Huang +2
We report the observation of two-threshold voltage-current characteristics accompanied by a peak of broadband current noise between the two threshold voltages in the insulating sta…
Spin and valley effects on the quantum phase transition in two dimensions
A. A. Shashkin, S. V. Kravchenko
Using several independent methods, we find that the metal-insulator transition occurs in the strongly-interacting two-valley two-dimensional electron system in ultra-high mobility…
Noise signal as input data in self-organized neural networks
V. Kagalovsky, D. Nemirovsky, S. V. Kravchenko
Self-organizing neural networks are used to analyze uncorrelated white noises of different distribution types (normal, triangular, and uniform). The artificially generated noises a…
Band Flattening and Landau Level Merging in Strongly-Correlated Two-Dimensional Electron Systems
V. T. Dolgopolov, M. Yu. Melnikov, A. A. Shashkin +1
We review recent experimental results indicating the band flattening and Landau level merging at the chemical potential in strongly-correlated two-dimensional (2D) electron systems…
Spin effect on the low-temperature resistivity maximum in a strongly interacting 2D electron system
A. A. Shashkin, M. Yu. Melnikov, V. T. Dolgopolov +6
The increase in the resistivity with decreasing temperature followed by a drop by more than one order of magnitude is observed on the metallic side near the zero-magnetic-field met…
Metal-insulator transition and low-density phases in a strongly-interacting two-dimensional electron system
A. A. Shashkin, S. V. Kravchenko
We review recent experimental results on the metal-insulator transition and low-density phases in strongly-interacting, low-disordered Si-based two-dimensional electron systems. Sp…
Manifestation of strong correlations in transport in ultra-clean SiGe/Si/SiGe quantum wells
A. A. Shashkin, M. Yu. Melnikov, V. T. Dolgopolov +6
We observe that in a strongly interacting two-dimensional electron system in ultra-clean SiGe/Si/SiGe quantum wells, the resistivity on the metallic side near the metal-insulator t…
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…
Recent developments in the field of the metal-insulator transition in two dimensions
Alexander A. Shashkin, Sergey V. Kravchenko
We review the latest developments in the field of the metal-insulator transition in strongly-correlated two-dimensional electron systems. Particular attention is given to recent di…
Quantum phase transition in ultrahigh mobility SiGe/Si/SiGe two-dimensional electron system
M. Yu. Melnikov, A. A. Shashkin, V. T. Dolgopolov +4
The metal-insulator transition (MIT) is an exceptional test bed for studying strong electron correlations in two dimensions in the presence of disorder. In the present study, it is…
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…
Spin polarization and exchange-correlation effects in transport properties of two-dimensional electron systems in silicon
V. T. Dolgopolov, A. A. Shashkin, S. V. Kravchenko
We show that the parallel magnetic field-induced increase in the critical electron density for the Anderson transition in a strongly interacting two-dimensional electron system is…
Metal-insulator transition in a strongly-correlated two-dimensional electron system
A. A. Shashkin, S. V. Kravchenko
Experimental results on the metal-insulator transition and related phenomena in strongly interacting two-dimensional electron systems are discussed. Special attention is given to r…
Indication of band flattening at the Fermi level in a strongly correlated electron system
M. Yu. Melnikov, A. A. Shashkin, V. T. Dolgopolov +3
Using ultra-high quality SiGe/Si/SiGe quantum wells at millikelvin temperatures, we experimentally compare the energy-averaged effective mass, , with that at the Fermi level, $m…
The effective electron mass in high-mobility SiGe/Si/SiGe quantum wells
M. Yu. Melnikov, A. A. Shashkin, V. T. Dolgopolov +3
The effective mass, m*, of the electrons confined in high-mobility SiGe/Si/SiGe quantum wells has been measured by the analysis of the temperature dependence of the Shubnikov-de Ha…
Influence of spin polarization on resistivity of a two-dimensional electron gas in Si MOSFET at metallic densities
I. Shlimak, A. Butenko, D. I. Golosov +2
Positive magnetoresistance (PMR) of a silicon MOSFET in parallel magnetic fields B has been measured at high electron densities n >> n_c where n_c is the critical density of the me…
Critical Behavior of a Strongly Interacting 2D Electron System
A. Mokashi, S. Li, Bo Wen +4
With decreasing density the thermopower of a low-disorder 2D electron system in silicon is found to exhibit a sharp increase by more than an order of magnitude, tending t…
A metal-insulator transition in 2D: Established facts and open questions
S. V. Kravchenko, M. P. Sarachik
The discovery of a metallic state and a metal-insulator transition (MIT) in two-dimensional (2D) electron systems challenges one of the most influential paradigms of modern mesosco…
Quantum phase transitions in two-dimensional electron systems
A. A. Shashkin, S. V. Kravchenko
This is a chapter for the book "Understanding Quantum Phase Transitions" edited by Lincoln D. Carr (Taylor & Francis, Boca Raton, 2010)
Flow diagram of the metal-insulator transition in two dimensions
S. Anissimova, S. V. Kravchenko, A. Punnoose +2
The discovery of the metal-insulator transition (MIT) in two-dimensional (2D) electron systems challenged the veracity of one of the most influential conjectures in the physics of…
Thermodynamic magnetization of a strongly correlated two-dimensional electron system
S. V. Kravchenko, A. A. Shashkin, S. Anissimova +4
We measure thermodynamic magnetization of a low-disordered, strongly correlated two-dimensional electron system in silicon. Pauli spin susceptibility is observed to grow critically…
Conductivity of a spin-polarized two-dimensional electron liquid in the ballistic regime
A. A. Shashkin, E. V. Deviatov, V. T. Dolgopolov +5
In the ballistic regime, the metallic temperature dependence of the conductivity in a two-dimensional electron system in silicon is found to change non-monotonically with the degre…
Magnetization of a strongly interacting two-dimensional electron system in perpendicular magnetic fields
S. Anissimova, A. Venkatesan, A. A. Shashkin +3
We measure the thermodynamic magnetization of a low-disordered, strongly correlated two-dimensional electron system in silicon in perpendicular magnetic fields. A new, parameter-fr…