Dresden 2009 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 38: Correlated Electrons: Low-dimensional Systems - Models 1
TT 38.9: Vortrag
Donnerstag, 26. März 2009, 12:00–12:15, HSZ 301
Quantum oscillations from Fermi arcs — •Heidrun Weber1,2 and Marcel Franz2 — 1Institut für Theoretische Physik, Universität zu Köln, Zülpicher Str. 77, 50937 Köln, Germany — 2Department of Physics and Astronomy, University of British Columbia, Vancouver, BC, Canada, V6T 1Z1
When a metal is subjected to a strong magnetic field B, nearly all measurable quantities exhibit oscillations periodic in 1/B. Such strong quantum oscillations represent a canonical probe of the Fermi surface, a defining property of a metal. We will discuss a new mechanism for quantum oscillations which requires only finite segments of a Fermi surface to exist, terminated by a pairing gap. We consider a real-space version of a BCS-like model Hamiltonian, whose hopping amplitude includes the usual Peierls factor and whose superconducting order parameter takes into account the existence of an Abrikosov vortex lattice. By a fully quantum mechanical treatment of the model we show that the density of states at the Fermi level exhibits an oscillatory behavior. Our results reconcile the recent breakthrough experiments showing quantum oscillations in a cuprate superconductor YBa2Cu3O6.51, with a well-established result of many angle resolved photoemission (ARPES) studies which consistently indicate Fermi arcs - truncated segments of a Fermi surface - in the normal state of cuprates.