Bulletin of the American Physical Society
APS March Meeting 2013
Volume 58, Number 1
Monday–Friday, March 18–22, 2013; Baltimore, Maryland
Session R3: Invited Session: Nonequilibrium Relaxation and Aging in Materials
2:30 PM–5:30 PM,
Wednesday, March 20, 2013
Room: Ballroom III
Sponsoring Units: GSNP DCMP
Chair: Uew Tauber, Virginia Polytechnical Institute and State University
Abstract ID: BAPS.2013.MAR.R3.1
Abstract: R3.00001 : Nonequilibrium behavior in strongly correlated electron systems*
2:30 PM–3:06 PM
(National High Magnetic Field Laboratory, Florida State University)
There is growing evidence that nonequilibrium behavior may underlie many complex phenomena exhibited by strongly correlated electronic materials with disorder. A two-dimensional electron system (2DES) in Si metal-oxide-semiconductor field-effect transistors has emerged as an excellent model system for studying glassy or nonequilibrium charge dynamics near the metal-insulator transition (MIT). In particular, studies of both conductance relaxations and noise on disordered samples, using several different experimental protocols, have established that the 2DES in Si exhibits all the main manifestations of glassiness: slow, correlated dynamics, nonexponential relaxations, diverging equilibration time (as temperature $T\rightarrow 0$), aging and memory. The results provide strong evidence that many such universal features are robust manifestations of glassiness, regardless of the dimensionality of the system. In addition, the experiments show that the 2D MIT is closely related to the melting of this Coulomb glass. The observations are consistent with predictions of the theoretical models that describe the MIT as a Mott transition with disorder. Some effects that are unique to Coulomb glasses have also been revealed, which should have important implications for theoretical modeling of the glassy dynamics in a 2DES and other strongly correlated materials.
*Supported by NSF DMR-0905843 and NHMFL via NSF DMR-0654118.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2013.MAR.R3.1
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