Speaker
Dr
Andreas Hackl
(California Institute of Technology)
Description
Experiments on underdoped cuprate superconductors suggest an
intricate relation between the normal-state Nernst effect
and stripe order: The Nernst signal appears enhanced near
1/8 hole doping and its onset temperature scales with the
stripe-ordering temperature over some range of doping. Here,
we analyze the thermoelectric response inlayered metals with
spontaneously broken rotation ortranslation symmetry. For
broken rotation symmetry we identify the anisotropy of the
quasiparticle Nernst signal as an extremely sensitive probe
of Fermi surface distortions characteristic of the ordered
state. Applied to recent experiments, our results reinforce
the proposal that the underdoped cuprate superconductor YBCO
displays such "electron-nematic" order in the pseudogap
regime. Furthermore, we find that Fermi pockets caused by
translational symmetry breaking lead to a strongly enhanced
Nernst signal with a sign depending on the modulation
period of the ordered state and other details of the Fermi
surface. We compare our findings with recent data from
Nd-LSCO and YBCO.
Primary author
Dr
Andreas Hackl
(California Institute of Technology)
