Spin transport of weakly disordered Heisenberg chain at infinite temperature
08.02.2017 at 14:00
We study the dynamical properties of the one dimensional Heisenberg model at infinite temperature in the presence of quenched disorder. This model is expected to exhibit a many body localization (MBL) transition at strong disorder. We compute the local dynamical spin correlation function and the ac conductivity using a nonperturbative continued fraction expansion.
Our main finding is the emergence of subdiffusive transport for arbitrarily weak disorder. The lack of a true diffusive phase contrasts with previous results and expectations obtained from exact diagonalization studies. In this seminar I will illustrate the method, describe its advantages and strengths and will show where it fails.
A 449, Theresienstr. 37