Low temperature nonequilibrium dynamics in transverse Ising spin glass

Abstract

The real part of the time-dependent ac susceptibility of the short-range Ising spin glass in a transverse field has been investigated at very low temperatures. We have used the quantum linear response theory and domain coarsening ideas of quantum droplet scaling theory. It is found that after a temperature quench to a temperature which is less than the spin glass transition temperature the ac susceptibility decreases with time elapsed after the initial quench towards equilibrium approximately logarithmically. It is shown that the transverse field of "tunneling" has nonessential effect to a nonequilibrium dynamical properties of the magnetic droplet system. It is found that the time dependence of ac susceptibility has a qualitative agreement with some experimental results.

Out-of-Equilibrium Dissipative <i>ac</i>—Susceptibility in Quantum Ising Spin Glass

“…P. Svedlindh et al [35] have investigated the behavior of and have found that decay is close to a logarithmic one. Shins et al [22] also show that susceptibility decays with time in a nearly logarithmic way.…”

“…The natural basis for the interpretation of aging is based on coarsening ideas of a slow domain growth of a spin-glass type ordered phase [8,13,14]. A large attention in the last decade was paid to the spin glasses representing a model systems for study of non-equilibrium dynamics providing a measure of processes causing the aging: the magnetic susceptibility [15][16][17][18][19][20][21][22].…”