Moshe Schechter's Homepage - Research

Moshe Schechter's Homepage Department of Physics, Ben Gurion University
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B I U S link image code HTML list !! Thermodynamic phases and dynamical properties of glasses Glassy dynamics, including phenomena such as slow relaxation and memory, are common to a wide variety of disordered and frustrated systems. Some of these systems, for example spin glasses, show also a thermodynamic phase transition to a low temperature glass phase, having long range glass order. Other systems, for example structural glasses, show a crossover, within which time scales quickly diverge, yet no thermodynamic transition nor a low temperature glass phase are present. Anisotropic dipolar glasses at low dipole concentrations have intrigued much attention, as fluctuations beyond mean field become exceedingly important. Using cluster Monte Carlo algorithm we have shown that at all concentrations, however small, a thermodynamic glass phase is present, with the critical temperature being linear in the concentration, in agreement with mean field theory. More recently we have addressed the question of the existence of a thermodynamic phase in the electron glass system. For systems with short range interactions, adding site disorder destroys the glass phase. For the electron glass, however, onsite disorder drives the glassy phase, introducing a thermodynamic glass phase at low temperature above a threshold disorder. Also out of equilibrium electron glasses differ from short range and dipolar glasses - an enhanced ratio of interaction to disorder slows down dynamics in the former, while enhances dynamics in the latter. This is in agreement with the notion that glassy behavior is driven by interaction disorder in dipolar and short range glasses, while it is driven by onsite disorder in the electron glass. {br} J. C. Andresen, H. G. Katzgraber, V. Oganesyan, and M. Schechter, Existence of a thermodynamic spin-glass phase in the zero-concentration limit of anisotropic dipolar systems. Physical Review X 4, 041016 (2014). O. Asban, A. Amir, Y. Imry, and M. Schechter, Effects of interactions and disorder on the relaxation of two-level systems in amorphous solids. Physical Review B 95, 144207 (2017). ** A. Barzegar, J. C. Andresen, M. Schechter, and H. G. Katzgraber, Numerical observation of a glassy phase in the three-dimensional Coulomb glass. Physical Review B 100, 104418 (2019). Password Summary of changes
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