Dresden 2014 – scientific programme
Parts | Days | Selection | Search | Updates | Downloads | Help
TT: Fachverband Tiefe Temperaturen
TT 101: Transport - Poster Session
TT 101.28: Poster
Thursday, April 3, 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.
S. Sendelbach et al., Phys. Rev. Lett. 103, 117001 (2009)
R. H. Koch et al., Phys. Rev. Lett. 98, 267003 (2007)
L. Faoro and L. B. Ioffe, Phys. Rev. Lett. 100, 227005 (2008)
S. Sendelbach et al., Phys. Rev. Lett. 100, 227006 (2008)
A. M. Tsvelik, "Quantum Field Theory in Condensed Matter Physics"
W. Mao et al., Phys. Rev. Lett. 91, 207203 (2003)
A. Shnirman and Y. Makhlin, Phys. Rev. Lett. 91, 207204 (2003)