2-7 June 2019
Simon Fraser University
America/Vancouver timezone
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The magnon-mediated attraction between two holes doped in a CuO2 layer

6 Jun 2019, 10:45
30m
SCP 8445.2 (Simon Fraser University)

SCP 8445.2

Simon Fraser University

Invited Speaker / Conférencier(ère) invité(e) Condensed Matter and Materials Physics / Physique de la matière condensée et matériaux (DCMMP-DPMCM) R1-3 Condensed Matter Theory II (DCMMP) | Théorie de la matière condensée II (DPMCM)

Speaker

Mona Berciu (University of British Columbia)

Description

We study a realistic three-band model for two holes doped into a CuO2 layer, using a variational method that allows us to turn on/off the exchange of magnons between the holes. This enables us to verify that the magnon-mediated effective hole-hole interaction is attractive and could therefore indeed be (part of) the superconducting glue. We derive its analytical expression and show that it consists of a novel kind of pair-hopping+spin-exchange terms. The coupling constant is fitted to numerical results obtained with the variational exact diagonalization. For realistic parameter values, this effective interaction is borderline strong enough to bind the holes into a pre-formed pair.

Primary author

Mona Berciu (University of British Columbia)

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