575 citations · 2.7k across the 54 of their papers we have counts for
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Engineering kekule superconductivity from layer-selective interactions in rhombohedral graphene
Hung Dinh Nguyen, Yafis Barlas
At weak coupling, finite-momentum superconductivity is typically associated with broken time-reversal or inversion symmetry of the Fermi surface. Here, we show that lattice-scale p…
Finite-momentum coupling of Higgs and Bardasis--Schrieffer modes in superconductors with competing pairing channels
Samuel Awelewa, Yafis Barlas, Maxim Dzero
In superconductors with competing pairing channels, two well defined excitations exist below the pair-breaking edge: the Higgs mode of the condensed -wave channel and the Bardas…
Quantum Geometry Induced Kekulé Superconductivity in Haldane phases
Yafis Barlas, Fan Zhang, Enrico Rossi
Chiral two-dimensional electron gases, which capture the electronic properties of graphene and rhombohedral graphene systems, exhibit singular momentum-space vortices and are susce…
Superfluid weight cross-over and critical temperature enhancement in singular flat bands
Guodong Jiang, Päivi Törmä, Yafis Barlas
Non-analytic Bloch eigenstates at isolated band degeneracy points exhibit singular behavior in the quantum metric. Here, a description of superfluid weight for zero-energy flat ban…
Geometric superfluid weight of composite bands in multiorbital superconductors
Guodong Jiang, Yafis Barlas
The superfluid weight of an isolated flat band in multi-orbital superconductors contains contributions from the band's quantum metric and a lattice geometric term that depends on t…
Pair Density Waves from Local Band Geometry
Guodong Jiang, Yafis Barlas
A band-projection formalism is developed for calculating the superfluid weight in two-dimensional multi-orbital superconductors with an orbital-dependent pairing. It is discovered…
Superconducting States in pseudo-Landau Levels of Strained Graphene
Bruno Uchoa, Yafis Barlas
We describe the formation of superconducting states in graphene in the presence of pseudo-Landau levels induced by strain, when time reversal symmetry is preserved. We show that su…
Collective modes in singlet superconductors
Yafis Barlas, C. M. Varma
A brief summary of collective mode excitations that can exist in singlet superconductors with irreducible representation is given. Such excitations may be classified as the cou…
Higgs Bosons in D-wave Superconductors
Yafis Barlas, C. M. Varma
The concept of "broken symmetry", that the symmetry of the vacuum may be lower than the Hamiltonian of a quantum theory, plays an important role in modern physics. A manifestation…