Showing papers by "Myriam P. Sarachik published in 2004"
TL;DR: The interplay between strong Coulomb interactions and randomness has been a long-standing problem in condensed matter physics as mentioned in this paper, and new evidence has emerged within the past decade indicating a transition from the insulating to metallic phase in two-dimensional systems of strongly interacting electrons.
Abstract: The interplay between strong Coulomb interactions and randomness has been a long-standing problem in condensed matter physics. According to the scaling theory of localization in two-dimensional systems of non-interacting or weakly interacting electrons, the ever-present randomness causes the resistance to rise as the temperature is decreased, leading to an insulating ground state. However, new evidence has emerged within the past decade indicating a transition from the insulating to metallic phase in two-dimensional systems of strongly interacting electrons. We review earlier experiments that demonstrate the unexpected presence of a metallic phase in two dimensions, and present an overview of recent experiments with emphasis on the anomalous magnetic properties that have been observed in the vicinity of the transition.
325 citations
TL;DR: In this paper, the dramatic response of strongly interacting electron systems to in-plane magnetic fields, and the evidence this provides for a possible quantum phase transition was reviewed. But it was believed for many years that no metallic phase is possible in two dimensions.
Abstract: Based on theory and experiments in weakly interacting electron systems, it was believed for many years that no metallic phase is possible in two dimensions. The unexpected observation of metallic-like behavior in strongly interacting electron systems has thus drawn considerable attention. Following background material and a brief history, we review the dramatic response of these 2D systems to in-plane magnetic fields, and the evidence this provides for a possible quantum phase transition.
3 citations
TL;DR: In this article, the scaling of magnetic relaxation data for Mn12-acetate due to ground-state tunneling at 0.24 K was extended to thermally assisted tunneling for higher temperature.
TL;DR: In this paper, the transverse anisotropy is distributed and the full transverse Hamiltonian, V T =g x μ B S x +E(S x 2 − S y 2 )+(C/2)(S + 4 + S − 4 ) is needed to explain the data.