6 papers
Optical Spectral Weight, Phase Stiffness and Tc Bounds for Trivial and Topological Flat Band Superconductors
Nishchhal Verma, Tamaghna Hazra, Mohit Randeria
We present exact results that give insight into how interactions lead to transport and superconductivity in a flat band where the electrons have no kinetic energy. We obtain bounds…
Luttinger sum rules and spin fractionalization in the SU(N) Kondo Lattice
Tamaghna Hazra, Piers Coleman
We show how Oshikawa's theorem for the Fermi surface volume of the Kondo lattice can be extended to the SU symmetric case. By extending the theorem, we are able to show that t…
Spectral functions across an Insulator to Superconductor Transition
Tamaghna Hazra, Nandini Trivedi, Mohit Randeria
In a minimal 2-band model with attractive interactions between fermions, we calculate the gap to single and two-particle excitations, the band-dependent spectral functions, the sup…
Band inversion and topology of the bulk electronic structure in FeSeTe
Himanshu Lohani, Tamaghna Hazra, Amit Ribak +5
FeSeTe (FeSeTe) has recently emerged as a promising candidate to host topological superconductivity, with a Dirac surface state and signatures of Majorana bou…
Upper bounds on the superfluid stiffness and superconducting : Applications to twisted-bilayer graphene and ultra-cold Fermi gases
Tamaghna Hazra, Nishchhal Verma, Mohit Randeria
Understanding the material parameters that control the superconducting transition temperature is a problem of fundamental importance. In many novel superconductors, phase flu…
Topological superconductivity in Dirac honeycomb systems
Kyungmin Lee, Tamaghna Hazra, Mohit Randeria +1
We predict two topological superconducting phases in microscopic models arising from the Berry phase associated with the valley degree of freedom in gapped Dirac honeycomb systems.…