Condensed Matter Seminar Series

Quantum Fluctuations and Disorder in Spin Chains

Jose A. Hoyos Neto

University of Missouri at Rolla

Friday February 23,  11:30 am,  Room 090 (CM conference room),  Physics Building

Abstract:   We compute the time-independent spin-spin correlation function of the random antiferromagnetic XXZ spin-1/2 chain. We show that the correlation amplitude between spins separated by odd and even distances are different, yielding important experimental consequences. Moreover, it is shown that the difference between the magnitude of these amplitudes is universal, i.e., disorder-independent. This is a consequence of an intricate interplay between quantum fluctuations and disorder, which leads to interesting entanglement zero-temperature properties, e.g., entanglement enhancing between spins separated by distances of order of the chain length.