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TT: Fachverband Tiefe Temperaturen

TT 26: Superconductivity: Vortex Dynamics, Vortex Phases, Pinning

TT 26.7: Talk

Wednesday, February 27, 2008, 17:30–17:45, H 3010

Signatures of the quantum zero-point motion of vortices in the cuprate superconductors — •Lorenz Bartosch¹ and Subir Sachdev² — ¹Institut für Theoretische Physik, Universität Frankfurt — ²Department of Physics, Harvard University

We explore the experimental implications of a recent theory of the quantum dynamics of vortices in two-dimensional superfluids proximate to Mott insulators [L. Balents, L. Bartosch, A. Burkov, S. Sachdev, and K. Sengupta, Physical Review B 71, 144508 (2005)]. The theory predicts modulations in the local density of states in the regions over which the vortices execute their quantum zero point motion. We use the spatial extent of such modulations in scanning tunneling microscopy measurements on the vortex lattice of BSCCO to estimate the inertial mass of a point vortex. We also discuss the influence of the quantum zero-point motion of a vortex on the electronic quasiparticle spectra and give a possible explanation for the origin of the 7 meV peaks which were observed in STM studies of the electronic structure of the vortex core in BSCCO.