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CAMP Seminar [Marker Lecture]: Models of optimal doping criticality in the cuprate superconductors
Add to Calendar 2019-12-06T15:00:00 2019-12-06T16:00:00 America/New_York CAMP Seminar [Marker Lecture]: Models of optimal doping criticality in the cuprate superconductors

Special CAMP Seminar

Davey Lab (339)
Start DateFri, Dec 06, 2019
10:00 AM
to
End DateFri, Dec 06, 2019
11:00 AM
Presented By
Subir Sachdev, Harvard University

Special CAMP Seminar [Marker Lecture]

There is now much experimental evidence for a significant change in the electronic structure of cuprate superconductors near a hole doping p=p_c optimal for superconductivity. Only for p > p_c do the electronic properties agree with the predictions of band theory. We argue that the data supports the existence of a quantum critical point (QCP) at p=p_c, and for p < p_c we have a novel state characterized by emergent gauge fields, possibly co-existing with conventional symmetry breaking orders. We present evidence that such a QCP is present in the Hubbard model with random, and all-to-all, hopping and exchange. We also discuss a SU(2) gauge theory for the QCP in model of fluctuating spin density waves in the absence of disorder.