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R. G. Herb Condensed Matter Seminar
Dynamics of interacting disordered quantum spin systems
Date: Thursday, February 4th
Time: 10:00 am
Place: 5310 Chamberlin
Speaker: Ivar Martin, Argonne National Laboratory
Abstract: Localized paramagnetic electrons are believed to be the cause of magnetic flux noise that plagues superconducting qubits; however, how such interacting spins generate frequency dependent noise of the 1/f form is not well understood due to the complexity of the full quantum mechanical treatment of interacting spin system. In this talk I will describe a dynamical real space renormalization group (RG) procedure that allows to calculate directly various dynamical quantities in a strongly disordered Heisenberg spin systems. Using this approach we generally find the dynamics that correspond to (anomalous) spin subdiffusion, with a powerlaw low-frequency magnetic noise, which appears to be consistent with what is observed in superconducting circuits.
Host: Vavilov
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