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Metal-insulator transition and glassy behavior in two-dimensional electron systems | | D. Popovic
; S. Bogdanovich
; J. Jaroszynski
; T. M. Klapwijk
; | | Date: |
20 Feb 2004 | | Journal: | Proceedings of SPIE, Vol. 5112, 99 (2003) | | Subject: | Strongly Correlated Electrons; Disordered Systems and Neural Networks | cond-mat.str-el cond-mat.dis-nn | | Abstract: | 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. | | Source: | arXiv, cond-mat/0402535 | | Services: | Forum | Review | PDF | Favorites | |
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