Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-02-20
Proceedings of SPIE, Vol. 5112, 99 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
Contribution to conference on "Noise as a tool for studying materials" (SPIE), Santa Fe, New Mexico, June 2003; 15 pages, 12 f
Scientific paper
10.1117/12.488847
Studies of low-frequency resistance noise demonstrate that glassy freezing occurs in a two-dimensional electron system in silicon in the vicinity of the metal-insulator transition (MIT). The width of the metallic glass phase, which separates the 2D metal and the (glassy) insulator, depends strongly on disorder, becoming extremely small in high-mobility (low-disorder) samples. The glass transition is manifested by a sudden and dramatic slowing down of the electron dynamics, and by a very abrupt change to the sort of statistics characteristic of complicated multistate systems. In particular, the behavior of the second spectrum, an important fourth-order noise statistic, indicates the presence of long-range correlations between fluctuators in the glassy phase, consistent with the hierarchical picture of glassy dynamics.
Bogdanovich Snezana
Jaroszynski Jan
Klapwijk Teum M.
Popovic Dragana
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