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Charge order and pseudogap phase in the cuprates

Event Details

Event Dates: 

Thursday, November 20, 2014 - 12:00pm

Seminar Location: 

  • JILA X317

Speaker Name(s): 

Andrey Chubukov

Speaker Affiliation(s): 

University of Minnesota
Seminar Type/Subject

Scientific Seminar Type: 

  • Condensed Matter Seminar

Event Details & Abstract: 

I analyze charge order in hole-doped cuprates. I argue that magnetically-mediated interaction, which is known to give rise to d-wave superconductivity, also gives rise to charge-density-wave instabilities with momenta Qx =(Q,0) and Qy =(0,Q), as seen in the experiments.  I show that the emerging charge order with Qx/Qy   is of stripe type and that a stripe charge order parameter by itself has two components: one is incommensurate density variation, another is incommensurate current.  Both components are non-zero in the CDW-ordered state, with the relative phase ± π/2.  Such an order breaks time reversal symmetry.  I further show that, before a true incommensurate CDW order sets in, the system develops a pre-emptive composite order which breaks lattice rotational symmetry and time-reversal symmetry but preserves a translational U(1) symmetry. I discuss the interplay between our CDW order and superconductivity and the phase diagram of underdoped cuprates.