Office: 2165 NPB
EducationPhD Princeton University (1985)
Research GroupCondensed Matter Theory
Research InterestResearch interests include properties of heavy fermion and, more recently, high temperature cuprate and Fe-based superconductors. The cuprate materials, with Tc's of order 100K or above, evolve by doping or applied pressure from 2D "parent" Mott insulators. The more recently discovered Fe-based pnictide and chalcogenide superconductors have Tc's up to 55K and parent compounds are metallic. The physics of these new materials depends sensitively on the mulitorbital and multiband character of the Fermi surface. In the cuprates, there is strong evidence that superconductivity is unconventional (in particular, d-wave) in the sense that the superconducting order parameter or pair wave function has symmetry less than the underlying crystal lattice. While the order parameters in the Fe-pnictide systems are thought to be "s-wave" or "conventional" according to the above definition, they may change sign and/or have strong anisotropy and even gap nodes. Currently my research is focused on understanding the effects of the multiorbital physics on the pairing in both cuprates and pnictides, and exploring the consequences of this gap symmetry/structure phenomenologically. I have a continuing strong interest in the effects of disorder on the superconducting state.
Select Publications"Using Gap Symmetry and Structure to Reveal the Pairing Mechanism in Fe-based Superconductors", P.J. Hirschfeld, Comptes Rendus Physique, 17, 197 (2016).
"Effect of magnetic frustration on superconductivity and nematicity in Fe chalcogenides", J. K. Glasbrenner, H. O. Jeschke, R. Valent, P. J. Hirschfeld, and I. I. Mazin, Nat. Phys. 11, 953 (2015).
"Interpretation of scanning tunneling impurity states and quasiparticle interference in cuprates", A. Kreisel, Peayush Choubey, T. Berlijn, B. M. Andersen and P. J. Hirschfeld, Phys. Rev. Lett. 114, 217002 (2015).
"Emergent defect states as a source of resistivity anisotropy in the nematic phase of iron pnictides", Maria N. Gastiasoro, I. Paul, Y. Wang, P. J. Hirschfeld, and Brian M. Andersen, Phys. Rev. Lett 113, 127001 (2014).