448 citations · 2.9k across the 54 of their papers we have counts for
26 papers · 1 filter
Linear and non-linear current response in disordered d-wave superconductors
L. Benfatto, C. Castellani, G. Seibold
We present a detailed theoretical investigation of the linear and non-linear optical response in a model system for a disordered d-wave superconductor, showing that for both quanti…
Generalized Josephson plasmons in bilayer superconductors
Niccolò Sellati, Francesco Gabriele, Claudio Castellani +1
Layered superconductors like High-Tc cuprates display out-of-plane plasma oscillations between layers sustained by the weak Josephson coupling among the superconducting sheets, the…
Comment on: Calculation of an Enhanced Symmetry Mode Induced by Higgs Oscillations in the Raman Spectrum of High-Temperature Cuprate Superconductors
L. Benfatto, C. Castellani, T. Cea
In a recent manuscript Phys. Rev. Lett. 127, 197001 (2021) Puviani et al. claim that the Higgs mode gives an enhancement of the Raman response in the symmetric Raman chann…
THz non-linear optical response in cuprates: predominance of the BCS response over the Higgs mode
Mattia Udina, Jacopo Fiore, Tommaso Cea +3
Recent experiments with strong THz fields in unconventional cuprates superconductors have clearly evidenced an increase of the non-linear optical response below the superconducting…
Transport signatures of fragile-glass dynamics in the melting of the two-dimensional vortex lattice
Ilaria Maccari, Bal K. Pokharel, Jasminka Terzic +8
In two-dimensional (2D) systems, the melting from a solid to an isotropic liquid can occur via an intermediate phase that retains orientational order. However, in 2D superconductin…
Generalized plasma waves in layered superconductors
F. Gabriele, C. Castellani, L. Benfatto
In a layered and strongly anisotropic superconductor the hybrid modes provided by the propagation of electromagnetic waves in the matter identify two well separate energy scales co…
Uniformly frustrated XY model: strengthening of the vortex lattice by intrinsic disorder
Ilaria Maccari, Lara Benfatto, Claudio Castellani
In superconducting films, the role of intrinsic disorder is typically to compete with superconductivity by fragmenting the global phase coherence and lowering the superfluid densit…
Adiabatic transition from a BCS superconductor to a Fermi liquid and phase dynamics
G. Seibold, C. Castellani, J. Lorenzana
We investigate the physics of an adiabatic transition from a BCS superconductor to a Fermi liquid for an exponentially slow decreasing pairing interaction. In particular, we show t…
Disordered XY model: effective medium theory and beyond
Ilaria Maccari, Lara Benfatto, Claudio Castellani
We study the effect of uncorrelated random disorder on the temperature dependence of the superfluid stiffness in the two-dimensional classical XY model. By means of a perturbative…
Melting of the vortex lattice through intermediate hexatic fluid in a-MoGe thin film
Indranil Roy, Surajit Dutta, Aditya N. Roy Choudhury +8
The hexatic fluid refers to a phase in between a solid and a liquid which has short range positional order but quasi-long range orientational order. In the celebrated theory of Ber…
BKT universality class in the presence of correlated disorder
Ilaria Maccari, Lara Benfatto, Claudio Castellani
The correct detection of the Berezinskii-Kosterlitz-Thouless (BKT) transition in quasi-two-dimensional superconductors still remains a controversial issue. Its main signatures, ind…
Optical signatures of the superconducting Goldstone mode in granular aluminum: experiments and theory
Uwe S. Pracht, Tommaso Cea, Nimrod Bachar +7
Recent advances in the experimental growth and control of disordered thin films, heterostructures, and interfaces provide a fertile ground for the observation and characterisation…
Non-linear optical effects and third-harmonic generation in superconductors: Cooper-pairs vs Higgs mode contribution
T. Cea, C. Castellani, L. Benfatto
The recent observation of a transmitted Thz pulse oscillating at three times the frequency of the incident light paves the way to a new protocol to access resonant excitations in a…
Non-relativistic dynamics of the amplitude (Higgs) mode in superconductors
T. Cea, C. Castellani, G. Seibold +1
Despite the formal analogy with the Higgs particle, the amplitude fluctuations of the order parameter in weakly-coupled superconductors do not identify a real mode with a Lorentz-i…
Universal scaling of the order-parameter distribution in strongly disordered superconductors
G. Lemarié, A. Kamlapure, D. Bucheli +6
We investigate theoretically and experimentally the statistical properties of the inhomogeneous order-parameter distribution (OPD) at the verge of the superconductor-insulator tran…
Beresinskii-Kosterlitz-Thouless transition within the sine-Gordon approach: the role of the vortex-core energy
L. Benfatto, C. Castellani, T. Giamarchi
One of the most relevant manifestations of the Beresinskii-Kosterlitz-Thouless transition occurs in quasi-two-dimensional superconducting systems. The experimental advances made in…
Broadening of the Beresinkii-Kosterlitz-Thouless superconducting transition by inhomogeneity and finite-size effects
L. Benfatto, C. Castellani, T. Giamarchi
We discuss the crucial role played by finite-size effects and inhomogeneity on the Beresinkii-Kosterlitz-Thouless (BKT) transition in two-dimensional superconductors. In particular…
Modeling the Unconventional Superconducting Properties of Expanded AC Fullerides
M. Capone, M. Fabrizio, C. Castellani +1
The trivalent alkali fullerides AC, where C are a well established family of molecular superconductors. The electron pairing has s-wave symmetry and is due to sta…
Strongly Correlated Superconductivity rising from a Pseudo-gap Metal
Marco Schiro', Massimo Capone, Michele Fabrizio +1
We solve by Dynamical Mean Field Theory a toy-model which has a phase diagram strikingly similar to that of high superconductors: a bell-shaped superconducting region adjacen…
Doping dependence of the vortex-core energy in bilayer films of cuprates
L. Benfatto, C. Castellani, T. Giamarchi
The energy needed to create a vortex core is the basic ingredient to address the physics of thermal vortex fluctuations in underdoped cuprates. Here we theoretically investigate it…
Kosterlitz-Thouless behavior in layered superconductors: the role of the vortex-core energy
L. Benfatto, C. Castellani, T. Giamarchi
In layered superconductors with small interlayer Josephson coupling vortex-antivortex phase fluctuations characteristic of quasi two-dimensional (2D) Kosterlitz-Thouless (KT) behav…
Effect of mesoscopic inhomogeneities on local tunnelling density of states
L. Dell'Anna, J. Lorenzana, M. Capone +2
We carry out a theoretical analysis of the momentum dependence of the Fourier-transformed local density of states (LDOS) in the superconducting cuprates within a model considering…
Pseudogap and spectral function from superconducting fluctuations to the bosonic limit
A. Perali, P. Pieri, G. C. Strinati +1
The crossover from weak to strong coupling for a three dimensional continuum model of fermions interacting via an attractive contact potential is studied above the superconducting…
Quasiparticle conductivities in disordered d-wave superconductors
Michele Fabrizio, Luca Dell'Anna, Claudio Castellani
We study the quasiparticle transport coefficients in disordered d-wave superconductors. We find that spin and charge excitations are generally localized unless magnetic impurities…