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Negative superfluid density and spatial instabilities in driven superconductors
Andrey Grankin, Victor Galitski, Vadim Oganesyan
We consider excitation of Higgs modes via the modulation of the BCS coupling within the Migdal-Eliashberg-Keldysh theory of time-dependent superconductivity. Despite the presence o…
Enhanced Cooper Pairing via Random Matrix Phonons in Superconducting Grains
Andrey Grankin, Mohammad Hafezi, Victor Galitski
There is rich experimental evidence that granular superconductors and superconducting films often exhibit a higher transition temperature, , than that in bulk samples of the…
Integrable-to-Thermalizing Crossover in Non-Equilibrium Superconductors
Andrey Grankin, Victor Galitski
Motivated by the experiment by M. Budden {\em et al.} [Nature Physics {\bf 17}, 611 (2021)], who observed signatures of long-lived photo-induced superconductivity, we develop an ac…
Interplay of hyperbolic plasmons and superconductivity
Andrey Grankin, Victor Galitski
Hyperbolic plasmons are collective electron excitations in layered conductors. They are of relevance to a number of superconducting materials, including the cuprates and layered hy…
Surface Cooper pair spin waves in triplet superconductors
Nicholas R. Poniatowski, Jonathan B. Curtis, Charlotte G. L. Bøttcher +4
We study the electrodynamics of spin triplet superconductors including dipolar interactions, which give rise to an interplay between the collective spin dynamics of the condensate…
Enhancement of superconductivity with external phonon squeezing
Andrey Grankin, Mohammad Hafezi, Victor M. Galitski
Squeezing of phonons due to the non-linear coupling to electrons is a way to enhance superconductivity as theoretically studied in a recent work [Kennes et al. Nature Physics 13, 4…
Cavity Higgs-Polaritons
Zachary M. Raines, Andrew A. Allocca, Mohammad Hafezi +1
Motivated by the dramatic success of realizing cavity exciton-polariton condensation in experiment we consider the formation of polaritons from cavity photons and the amplitude or…
Manifestations of spin-orbit coupling in a cuprate superconductor
Zachary M. Raines, Andrew A. Allocca, Victor M. Galitski
Exciting new work on Bi2212 shows the presence of non-trivial spin-orbit coupling effects as seen in spin resolved ARPES data [Gotlieb et al., Science, 362, 1271-1275 (2018)]. Moti…
Cavity Quantum Eliashberg Enhancement of Superconductivity
Jonathan B. Curtis, Zachary M. Raines, Andrew A. Allocca +2
Driving a conventional superconductor with an appropriately tuned classical electromagnetic field can lead to an enhancement of superconductivity via a redistribution of the quasip…
Anomalous low-temperature enhancement of supercurrent in topological-insulator nanoribbon Josephson junctions: evidence for low-energy Andreev bound states
Morteza Kayyalha, Mehdi Kargarian, Aleksandr Kazakov +5
We report anomalous enhancement of the critical current at low temperatures in gate-tunable Josephson junctions made from topological insulator BiSbTeSe nanoribbons with superc…
Time-Reversal-Symmetry-Breaking Superconductivity in Epitaxial Bismuth/Nickel Bilayers
Xinxin Gong, Mehdi Kargarian, Alex Stern +6
Superconductivity that spontaneously breaks time-reversal symmetry (TRS) has been found, so far, only in a handful of 3D crystals with bulk inversion symmetry. Here we report an ob…
Hybridization of Higgs modes in a bond-density-wave state in cuprates
Zachary M. Raines, Valentin G. Stanev, Victor M. Galitski
Recently, several groups have reported observations of collective modes of the charge order present in underdoped cuprates. Motivated by these experiments, we study theoretically t…
Nonequilibrium enhancement of high-temperature superconductivity in a 3D model of cuprates
Zachary M. Raines, Valentin Stanev, Victor M. Galitski
Recent experiments in the cuprates have seen evidence of a transient superconducting state upon optical excitation polarized along the c-axis [R. Mankowsky et al., Nature 516, 71 (…
Long range -wave proximity effect into a disordered metal
Aydin Cem Keser, Valentin Stanev, Victor Galitski
We use quasiclassical methods of superconductivity to study the superconducting proximity effect from a topological -wave superconductor into a disordered one-dimensional metall…
Quasiclassical Eilenberger theory of the topological proximity effect in a superconducting nanowire
Valentin Stanev, Victor Galitski
We use the quasiclassical Eilenberger theory to study the topological superconducting proximity effects between a segment of a nanowire with a p-wave order parameter and a metallic…
Nonequilibrium probe of paired electron pockets in the underdoped cuprates
G. R. Boyd, So Takei, Victor Galitski
We propose an experimental method that can be used generally to test whether the cuprate pseudogap involves precursor pairing that acts to gap out the Fermi surface. The proposal i…
Topological superconductivity and Majorana fermions in hybrid structures involving cuprate high-T_c superconductors
So Takei, Benjamin M. Fregoso, Victor Galitski +1
The possibility of inducing topological superconductivity with cuprate high-temperature superconductors (HTSC) is studied for various heterostructures. We first consider a ballisti…
Microscopic theory for a ferromagnetic-nanowire/superconductor heterostructure: Transport, fluctuations and topological superconductivity
So Takei, Victor Galitski
Motivated by the recent experiment of Wang et al. [Nature Physics 6, 389 (2010)], who observed a highly unusual transport behavior of ferromagnetic Cobalt nanowires proximity-coupl…
Non-adiabatic Effects in the Braiding of Non-Abelian Anyons in Topological Superconductors
Meng Cheng, Victor Galitski, Sankar Das Sarma
Qubits in topological quantum computation are built from non-Abelian anyons. Adiabatic braiding of anyons is exploited as topologically protected logical gate operations. Thus, the…
Squeezed noise due to two-level system defects in superconducting resonator circuits
So Takei, Victor M. Galitski, Kevin D. Osborn
Motivated by recent surprising experimental results for the noise output of superconducting microfabricated resonators used in quantum computing applications and astronomy, we deve…
Gutzwiller-projected wave functions for the pseudogap state of underdoped high-temperature superconductors
Rajdeep Sensarma, Victor Galitski
Recent experiments strongly suggest that a Fermi surface reconstruction and multiple Fermi pockets are important common features of the underdoped high-temperature cuprate supercon…
Tunneling of anyonic Majorana excitations in topological superconductors
Meng Cheng, Roman M. Lutchyn, Victor Galitski +1
We consider topological superconductors and topological insulator/superconductor structures in the presence of multiple static vortices that host Majorana modes and focus on the Ma…
Non-perturbative Quantum Dynamics of the Order Parameter in the Pairing Model
Victor Galitski
We consider quantum dynamics of the order parameter in the discrete pairing model (Richardson model) in thermodynamic equilibrium. The integrable Richardson Hamiltonian is represen…
Giant Nernst Effect due to Fluctuating Cooper Pairs in Superconductors
M. N. Serbyn, M. A. Skvortsov, A. A. Varlamov +1
A theory of the fluctuation-induced Nernst effect is developed for arbitrary magnetic fields and temperatures beyond the upper critical field line in a two-dimensional superconduct…