University of Minnesota
School of Physics & Astronomy

Physics and Astronomy Calendar

Wednesday, October 5th 2016
2:30 pm:
Condensed Matter Seminar in Physics 110 PAN
Speaker: Srinivas Raghu, Stanford University
Subject: Composite fermions and the 2D field-tuned superconductor-insulator transition

In several two-dimensional films that exhibit a magnetic field-tuned superconductor to insulator transition (SIT), stable metallic phases have been observed. An influential theory of the SIT involves disorderd bosons (Cooper pairs and vortices) in a magnetic field. Building on this `dirty boson' description of the SIT, we suggest that the observed metallic behavior near the SIT is analogous to the composite Fermi liquid observed about half-filled Landau levels of the two-dimensional electron gas. The composite fermions here represent composites of vortices and Cooper pairs. We describe several experimental consequences stemming from these fermionized vortices.

Faculty Host: Rafael Fernandes

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