Dresden 2014 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 101: Transport - Poster Session
TT 101.28: Poster
Donnerstag, 3. April 2014, 15:00–19:00, P2
Fluctuations in the susceptibility of spin systems — •Pablo Schad1, Boris Narozhny1, Alexander Shnirman1,2, and Gerd Schön2,3 — 1Institut für Theorie der Kondensierten Materie, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 2DFG Center for Functional Nanostructures (CFN), Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany — 3Institut für Theoretische Festkörperphysik, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany
Motivated by experiments in the context of 1/f flux noise in SQUIDs and Josephson qubits [1], which is widely attributed to magnetic impurities on the device surfaces [e.g. 2,3,4], we consider fluctuations in the susceptibility of spin systems. We use the Majorana fermion representation for spins [5] and take advantage of generalized relations between spin and Majorana correlators [6]. A path integral formulation allows us to study the role of slow modes and their influence on higher-order correlators, e.g. fluctuations of the spin susceptibility.
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