Sergey Kravchenko


Ph.D., Institute of Solid State Physics, Chernogolovka, 1988

Area(s) of Expertise

Experimental Nanophysics

Research Interests

Professor Kravchenko is studying the low temperature (millikelvin) properties of low-dimensional disordered systems by means of transport, capacitance, and magnetization measurements.  His primary interest is to understand the nature of the anomalous metal-insulator transition in strongly interacting two-dimensional electron systems, discovered by him and his collaborators, and to determine its phase diagram.  This discovery was subject of editorial papers in Physics Today (twice in 1997), The Economist (1997), Nature (1997, 1999, 2003), Science (1998, 2000), Nature Physics (2007), Science Daily (2007), and elsewhere, and listed on the American Physical Society timeline as one of 50 main discoveries in mesoscopic physics of the last century.  It is still 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 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.

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120 Dana Research Center