Sergey Kravchenko Associate Professor PhD Institute of Solid State Physics, Chernogolovka, 1988 (617)373-2926 s.kravchenko@neu.edu

Research Summary:

Professor Kravchenko is studying the low temperature (millikelvin) properties of low-dimensional disordered systems by means of transport and capacitance measurements. His primary interest is to understand the nature of the anomalous metal-insulator transition in strongly interacting two-dimensional electron systems, recently discovered by him and his collaborators, and to determine its phase diagram. This discovery was reviewed in Physics Today, "Search and Discovery" section, July 1997, pp. 19-21; The Economist, "Science and Technology" section, July 1997, pp. 106-107; Nature, "News and Views" section, 389, 916 (1997), and elsewhere. At present, it is not known what physical mechanism is responsible for the metal-insulator transition, whether or not the resistance of the metallic state tends to zero in the millikelvin temperature range, or whether or not the system becomes magnetic. The experiments include magneto-transport and magneto-capacitance studies of Si metal-oxide-semiconductor field-effect transistors, p-SiGe heterostructures, and GaAs/AlGaAs heterostructures at temperatures down to 20 millikelvin and at magnetic fields up to 10 tesla.

Selected Recent Publications :

1. S. Anissimova, S. V. Kravchenko, A. Punnoose, A. M. Finkel'stein, and T. M. Klapwijk "Flow Diagram of the Metal-Insulator Transition in Two Dimensions" Nature Phys. 3, 707 (2007).
http://www.nature.com/nphys/journal/v3/n10/abs/nphys685.html

2. S. Anissimova, A. Venkatesan, A. A. Shashkin, M. R. Sakr, S. V. Kravchenko, and T. M. Klapwijk "Magnetization of a Strongly Interacting Two-Dimensional Electron System in Perpendicular Magnetic Fields" Phys. Rev. Lett. 96, 046409 (2006).
http://dx.doi.org/10.1103/PhysRevLett.96.046409

3. A. A. Shashkin, S. Anissimova, M. R. Sakr, S. V. Kravchenko, V. T. Dolgopolov, and T. M. Klapwijk "Pauli Spin Susceptibility of a Strongly Correlated 2D Electron Liquid" Phys. Rev. Lett. 96, 036403 (2006).
http://dx.doi.org/10.1103/PhysRevLett.96.036403

4. S. V. Kravchenko and M. P. Sarachik "Metal-insulator transition in two-dimensional electron systems" Rep. Prog. Phys. 67, 1 (2004).
http://dx.doi.org/10.1088/0034-4885/67/1/R01

5. A. A. Shashkin, Maryam Rahimi, S. Anissimova, S. V. Kravchenko, V. T. Dolgopolov, and T. M. Klapwijk "Spin-Independent Origin of the Strongly Enhanced Effective Mass in a Dilute 2D Electron System" Phys. Rev. Lett. 91, 046403 (2003).
http://dx.doi.org/10.1103/PhysRevLett.91.046403

Related links