7 papers
Physical constraints on effective non-Hermitian systems
Aaron Kleger, Rufus Boyack
Interacting and open quantum systems can be formulated in terms of an effective non-Hermitian Hamiltonian (NHH), however, there are important constraints that must be satisfied by…
Universal Theory of Incoherent Metals
Aaron Kleger, Nikolay Gnezdilov, Rufus Boyack
Numerous unconventional superconductors such as cuprates, heavy-fermions, and twisted-bilayer graphene exhibit incoherent metallic transport above the superconducting critical temp…
Geometric superfluid stiffness of Kekulé superconductivity in magic-angle twisted bilayer graphene
Ke Wang, Qijin Chen, Rufus Boyack +1
Superconductivity in twisted graphene is probed by tunneling spectroscopy and superfluid stiffness, two observables that access the same order parameter from complementary perspect…
Anomalous Superfluid Density in Pair-Density-Wave Superconductors
Ke Wang, Qijin Chen, Rufus Boyack +1
Pair-density-wave (PDW) states are a long-sought-after phase of quantum materials, with the potential to unravel the mysteries of high- cuprates and other strongly correlated…
Upper bound on in a strongly coupled electron-boson superconductor
Nikolay V. Gnezdilov, Rufus Boyack
Migdal-Eliashberg theory of boson-mediated superconductivity contains a divergence in the critical temperature for strong electron-boson coupling . In the conve…
Universal scaling relations in electron-phonon superconductors
Joshuah T. Heath, Rufus Boyack
We study linear scaling relations in electron-phonon superconductors. By combining numerical and analytical techniques, we find linear Homes scaling relations between the zero-temp…