82 citations · 969 across the 61 of their papers we have counts for
32 papers · 1 filter
Evolution of plasmon excitations across the phase diagram of the cuprate superconductor LaSrCuO
M. Hepting, T. D. Boyko, V. Zimmermann +19
We use resonant inelastic x-ray scattering (RIXS) at the O - and Cu -edges to investigate the doping- and temperature dependence of low-energy plasmon excitations in La$_{2-x…
Plasmarons in high-temperature cuprate superconductors
Hiroyuki Yamase, Matias Bejas, Andres Greco
Metallic systems exhibit plasmons as elementary charge excitations. This fundamental concept was reinforced also in high-temperature cuprate superconductors recently, although cupr…
Low-energy plasmon excitations in infinite-layer nickelates
Luciano Zinni, Matías Bejas, Hiroyuki Yamase +1
The discovery of superconductivity in infinite-layer nickelates is presently an important topic in condensed-matter physics, and potential similarities to and differences from cupr…
Detector Array Readout with Traveling Wave Amplifiers
A. Giachero, C. Barone, M. Borghesi +35
Noise at the quantum limit over a large bandwidth is a fundamental requirement for future applications operating at millikelvin temperatures, such as the neutrino mass measurement,…
Bimodal Approach for Noise Figures of Merit Evaluation in Quantum-Limited Josephson Traveling Wave Parametric Amplifiers
L. Fasolo, C. Barone, M. Borghesi +37
The advent of ultra-low noise microwave amplifiers revolutionized several research fields demanding quantum-limited technologies. Exploiting a theoretical bimodal description of a…
Superconductivity with and without glue and the role of the double-occupancy forbidding constraint in the t-J-V model
Luciano Zinni, Matías Bejas, Andrés Greco
The occurrence of retarded (with glue) and unretarded (without glue) pairing is thoroughly discussed in cuprates. We analyze some aspects of this problem in the context of the t-J-…
Close inspection of plasmon excitations in cuprate superconductors
Andrés Greco, Hiroyuki Yamase, Matías Bejas
Recently resonant inelastic x-ray scattering experiments reported fine details of the charge excitations around the in-plane momentum for various doping…
Competition between spin-induced charge instabilities in underdoped cuprates
Roland Zeyher, Andres Greco
We study the static charge correlation function in an one-band model on a square lattice. The Hamiltonian consist of effective hoppings of the electrons between the lattice sites a…
Origin of the high-energy charge excitations observed by resonant inelastic x-ray scattering in cuprate superconductors
Andrés Greco, Hiroyuki Yamase, Matías Bejas
The recent development of x-ray scattering techniques revealed the charge-excitation spectrum in high- cuprate superconductors. While the presence of a dispersive signal in th…
Doping dependence of d-wave bond-charge excitations in electron-doped cuprates
Hiroyuki Yamase, Matías Bejas, Andrés Greco
Motivated by the recent experiments reporting the doping dependence of the short-range charge order (CO) in electron-doped cuprates, we study the resonant x-ray scattering spectrum…
Dual structure in the charge excitation spectrum of electron-doped cuprates
Matias Bejas, Hiroyuki Yamase, Andres Greco
Motivated by the recent resonant x-ray scattering (RXS) and resonant inelastic x-ray scattering (RIXS) experiments in electron-doped cuprates, we study the charge excitation spectr…
Mechanism for unconventional superconductivity in the hole-doped Rashba-Hubbard model
Andrés Greco, Andreas P. Schnyder
Motivated by the recent resurgence of interest in topological superconductivity, we study in this paper superconducting pairing instabilities of the hole-doped Rashba-Hubbard model…
Isotope effect on the superconducting critical temperature of cuprates in the presence of charge order
Andrés Greco, Roland Zeyher
Using the large- limit of the - model and allowing also for phonons and the electron-phonon interaction we study the isotope effect for coupling constants appropriate…
Pseudogap in cuprates driven by d-wave flux-phase order proximity effects: A theoretical analysis from Raman and ARPES experiments
Andres Greco, Matias Bejas
One of the puzzling characteristics of the pseudogap phase of high- cuprates is the nodal-antinodal dichotomy. While the nodal quasiparticles have a Fermi liquid behaviour, th…
Self-energy effects in cuprates and the dome-shaped behavior of the superconducting critical temperature
Guillermo Buzon, Adriana Foussats, Matías Bejas +1
Hole doped cuprates show a superconducting critical temperature which follows an universal dome-shaped behavior as function of doping. It is believed that the origin of super…
Strong particle-hole asymmetry of charge instabilities in doped Mott insulators
Matias Bejas, Andres Greco, Hiroyuki Yamase
We study possible charge instabilities in doped Mott insulators by employing the two-dimensional t-J model with a positive value of the next nearest-neighbor hopping integral t' on…
Self-energy effects in electronic Raman spectra of doped cuprates due to magnetic fluctuations
Roland Zeyher, Andrés Greco
We present results for magnetic excitations in doped copper oxides using the random phase approximation and itinerant electrons. In the [1,0] direction the observed excitations res…
Short-ranged and short-lived charge-density-wave order and pseudogap features in underdoped cuprates superconductors
Andrés Greco, Matías Bejas
The pseudogap phase of high- cuprates is controversially attributed to preformed pairs or to a phase which coexists and competes with superconductivity. One of the challenges…
Fermi arcs and isotope effect of the magnetic penetration depth in underdoped cuprates
Roland Zeyher, Andrés Greco
The isotope coefficient of the magnetic penetration depth in the superconducting state is studied at T=0 for a -CDW and a nodal metal model. Disregarding superconductivity t…
Doping and temperature dependence of the pseudogap and Fermi arcs in cuprates from -CDW short-range fluctuations in the context of the t-J model
Matías Bejas, Guillermo Buzon, Andrés Greco +1
At mean-field level the t-J model shows a phase diagram with close analogies to the phase diagram of hole doped cuprates. An order parameter associated with the flux or charge-…
Two distinct quasiparticle inelastic scattering rates in the model and their relevance for high- cuprates superconductors
Guillermo Buzon, Andrés Greco
The recent findings about two distinct quasiparticle inelastic scattering rates in angle-dependent magnetoresistance (ADMR) experiments in overdoped high- cuprates superconduc…
Evidence for two competing order parameters in underdoped cuprates superconductors from a model analysis of the Fermi-arc effects
Andrés Greco
Preformed pairs above and the two-gap scenarios are two main proposals for describing the low doping pseudogap phase of high- cuprates. Very recent angle-resolved photoe…
Large isotope effect on in cuprates despite of a small electron-phonon coupling
Roland Zeyher, Andrés Greco
We calculate the isotope coefficients and for the superconducting critical temperature and the pseudogap temperature in a mean-field treatment of the t-…
Cooperative effect of phonons and electronic correlations for superconductivity in cobaltates
A. Foussats, A. Greco, M. Bejas +1
We propose that unconventional superconductivity in hydrated sodium cobaltate results from an interplay of electronic correlations and electron-phonon interactions. On…