191 citations · 1.9k across the 58 of their papers we have counts for
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Superconducting nanoribbon with a constriction: A quantum-confined Josephson junction
L. Flammia, L. -F. Zhang, L. Covaci +2
Extended defects are known to strongly affect nanoscale superconductors. Here we report the properties of superconducting nanoribbons with a constriction formed between two adjacen…
Topological phase transitions in small mesoscopic chiral p-wave superconductors
L. -F. Zhang, L. Covaci, M. V. Milošević
Spin-triplet chiral p-wave superconductivity is typically described by a two-component order parameter, and as such is prone to unique emergent effects when compared to the standar…
Multifaceted impact of a surface step on superconductivity in atomically thin films
L. -F. Zhang, L. Flammia, L. Covaci +2
Recent experiments show that an atomic step on the surface of atomically thin metallic films can strongly affect electronic transport. Here we reveal multiple and versatile effects…
Electronic properties of emergent topological defects in chiral -wave superconductivity
L. -F. Zhang, V. Fernández Becerra, L. Covaci +1
Chiral -wave superconductors in applied magnetic field can exhibit more complex topological defects than just conventional superconducting vortices, due to the two-component ord…
Using magnetic stripes to stabilize superfluidity in electron-hole double monolayer graphene
Luca Dell'Anna, Andrea Perali, Lucian Covaci +1
Experiments have confirmed that double monolayer graphene cannot generate finite temperature electron-hole superfluidity. This has been shown to be due to very strong screening of…
Disordered graphene Josephson junctions
W. A. Munoz, L. Covaci, F. M. Peeters
A tight-binding approach based on the Chebyshev-Bogoliubov-de Gennes method is used to describe disordered single-layer graphene Josephson junctions. Scattering by vacancies, rippl…
The Tomasch effect in nanoscale superconductors
L. -F. Zhang, L. Covaci, F. M. Peeters
The Tomasch effect (TE) is due to quasiparticle interference (QPI) as induced by a nonuniform superconducting order parameter, which results in oscillations in the density of state…
Position-dependent effect of non-magnetic impurities on superconducting properties of nanowires
L. -F. Zhang, L. Covaci, F. M. Peeters
Anderson's theorem states that non-magnetic impurities do not change the bulk properties of conventional superconductors. However, as the dimensionality is reduced, the effect of i…
Superconducting current and proximity effect in ABA and ABC multilayer graphene Josephson junctions
W. A. Munoz, L. Covaci, F. M. Peeters
Using a numerical tight-binding approach based on the Chebyshev-Bogoliubov-de Gennes method we describe Josephson junctions made of multilayer graphene contacted by top superconduc…
Tight-binding description of intrinsic superconducting correlations in multilayer graphene
W. A. Munoz, L. Covaci, F. M. Peeters
Using highly efficient GPU-based simulations of the tight-binding Bogoliubov-de Gennes equations we solve self-consistently for the pair correlation in rhombohedral (ABC) and Berna…
Vortex states in nanoscale superconducting squares: the influence of quantum confinement
L. -F. Zhang, L. Covaci, M. V. Milošević +2
Bogoliubov-de Gennes theory is used to investigate the effect of the size of a superconducting square on the vortex states in the quantum confinement regime. When the superconducti…
Unconventional vortex states in nanoscale superconductors due to shape-induced resonances in the inhomogeneous Cooper-pair condensate
L. -F. Zhang, L. Covaci, M. V. Milošević +2
Vortex matter in mesoscopic superconductors is known to be strongly affected by the geometry of the sample. Here we show that in nanoscale superconductors with coherence length com…
Tight-binding study of bilayer graphene Josephson junctions
W. A. Muñoz, L. Covaci, F. M. Peeters
Using highly efficient simulations of the tight-binding Bogoliubov-de Gennes model we solved self-consistently for the pair correlation and the Josephson current in a Superconducti…
Superconducting proximity effect in graphene under inhomogeneous strain
Lucian Covaci, Francois Peeters
The interplay between quantum Hall states and Cooper pairs is usually hindered by the suppression of the superconducting state due to the strong magnetic fields needed to observe t…
Rectification by imprinted phase in a Josephson junction
G. R. Berdiyorov, M. V. Milošević, L. Covaci +1
A Josephson phase shift can be induced in a Josephson junction by a strategically nearby pinned Abrikosov vortex (AV). For an asymmetric distribution of imprinted phase along the j…
Proximity induced pseudogap in mesoscopic superconductor/normal-metal bilayers
Guo-Qiao Zha, Lucian Covaci, Shi-Ping Zhou +1
Recent scanning tunneling microscopy measurements of the proximity effect in Au/LaSrCuO and LaSrCuO/LaSrCuO bilayers…
Chebyshev-BdG: an efficient numerical approach to inhomogeneous superconductivity
L. Covaci, F. M. Peeters, M. Berciu
We propose a highly efficient numerical method to describe inhomogeneous superconductivity by using the kernel polynomial method in order to calculate the Green's functions of a su…
Giant proximity effect in a phase-fluctuating superconductor
D. Marchand, L. Covaci, M. Berciu +1
When a tunneling barrier between two superconductors is formed by a normal material that would be a superconductor in the absence of phase fluctuations, the resulting Josephson eff…
Holstein polaron: the effect of multiple phonon modes
Lucian Covaci, Mona Berciu
We generalize the Momentum Average approximations MA and MA to study the effects of coupling to multiple optical phonons on the properties of a Holstein polaron. As…
Proximity effect in clean strong/weak/strong superconducting tri-layers
Lucian Covaci, Frank Marsiglio
Recent measurements of the Josephson critical current through LSCO/LCO/LSCO thin films showed an unusually large proximity effect. Using the Bogoliubov-de Gennes (BdG) equations fo…