Department of Physics | University of Florida

Theory of superconductivity, strongly correlated Fermi systems & electronic disorder.

The Hirschfeld group studies problems of modern many-body theory associated with quantum materials. These are condensed matter systems that cannot be described by the conventional Bloch picture of a single electron moving in a periodic potential. They exhibit remarkable collective phenomena and novel ordered phases, and are expected to be relevant to the next generation of electronic devices. A particular focus is on "unconventional" superconductors, where electron pairing is driven by repulsive Coulomb interactions.

Current group: 1st row: Saurabh, Peayush, Andy, Xiao, Jasdeep; 2nd row: Shinibali, Peter. View research group alumni and collaborators.


  • Defects in correlated systems

    Impurities induce magnetic droplets in strongly correlated systems (see Rev. Mod. Phys. 81, 45 (2009)), cover photo shown below top). The overlap of these droplets leads to long-range antiferromagnetic order, an "order by disorder" phenomenon enhanced by d-wave superconductivity. Recently we showed how similar "nematogens" -- elongated magnetic defects induced by a simple impurity (bottom) -- can form in the nematic phase of Fe-based superconductors with stripelike magnetic correlations. M.N. Gastiasoro et al, Phys. Rev. Lett. 113, 127001 (2014).

  • Theory of STM

    Scanning tunneling microscopy (STM) provides spectacular real-space images of the surfaces of metals, and has been used to shed light on the superconducting and normal states of high-Tc superconductors. The quasiparticle interference (QPI) technique can provide momentum space information as well. Recently we pioneered the "BdG+Wannier" method to predict sub-unit-cell conductance maps for comparison with STM images. Predicted conductance map for a Zn impurity in BSCCO (below top) and QPI maps of a weak impurity (below bottom) in conventional and BdG+W approach, compared to experiment. A. Kreisel et al., Phys. Rev. Lett. 114, 217002 (2015).


© 2015 Peter J. Hirschfeld. All rights reserved.

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