135 citations · 415 across the 18 of their papers we have counts for
20 papers
Electron-Mediated Phonon Polaritons in Quantum Cavities
Mattia Udina, David Hagenmüller, Indranil Paul
Phonon-photon coupling in quantum materials is commonly treated as an effective direct interaction, neglecting the crucial role played by electrons. Here we develop a gauge-invaria…
THz-induced phonomagnetism in diamagnetic quantum paraelectric KTaO
C. Kadlec, F. Kadlec, D. Repček +13
The current efforts striving to develop new ways of data manipulation are aimed at ultrafast control of magnetization in magnetic materials, as well as at inducing magnetic moments…
Measuring momentum-resolved dissipation of phonon-polaritons in LiNbO with terahertz driving
Megan F. Biggs, Rossella Acampora, Niccolò Sellati +5
Mapping the dispersion of polaritons, hybrid quasiparticles arising from light-matter coupling, can provide key insights into the material dielectric response, coupling strength, a…
Anharmonic phonon coupling enabled by local inversion symmetry breaking at domain walls in ferroelastics
Seyyed Jabbar Mousavi, Vivek Unikandanunni, Niccolo Sellati +7
In ferroelastic materials, spontaneous symmetry breaking leads to the formation of twin domains. Although the bulk crystal typically remains centrosymmetric, inversion symmetry can…
Revealing the nature of the charge density wave order of ErTe via Raman scattering under anisotropic strain
Theotime Freitas, Mattia Udina, Alexandr Alekhin +7
The nature of the charge density wave (CDW) order of the rare-earth tritelluride ErTe3 is investigated by Raman scattering under anisotropic strain. The CDW state of ErTe3 is uncon…
Two-dimensional THz spectroscopy in electronic systems: a many-body diagrammatic approach
Jacopo Fiore, Niccolò Sellati, Mattia Udina +1
The term two-dimensional coherent spectroscopy (2DCS) usually refers to experimental setups where a coherently generated electric field in a sample is recorded over many runs as a…
Antisymmetric Raman response
Mattia Udina, Indranil Paul
We develop the theory of antisymmetric Raman response, defined as the difference between the Raman signals of two scattering geometries related by an exchange of mutually perpendic…
Phonon-Polaritons in Non-Centrosymmetric Systems: Theory of Terahertz Pump-Optical Probe Spectroscopy
Niccolò Sellati, Jacopo Fiore, Stefano Paolo Villani +2
Hybrid lattice-light modes, known as phonon-polaritons, represent the backbone of advanced protocols based on THz pumping of infrared modes. Here we provide a theoretical framework…
Revealing novel aspects of light-matter coupling in terahertz two-dimensional coherent spectroscopy: the case of the amplitude mode in superconductors
Kota Katsumi, Jacopo Fiore, Mattia Udina +7
Recently developed terahertz (THz) two-dimensional coherent spectroscopy (2DCS) is a powerful technique to obtain materials information in a fashion qualitatively different from ot…
Investigating Josephson plasmons in layered cuprates via nonlinear terahertz spectroscopy
Jacopo Fiore, Niccolò Sellati, Francesco Gabriele +4
Josephson plasmons in layered superconductors represent a natural source of optical non-linearity, thanks to their intrinsically anharmonic nature. Here we derive the selection rul…
Tracing the dynamics of superconducting order via transient third harmonic generation
Min-Jae Kim, Sergey Kovalev, Mattia Udina +13
Ultrafast optical control of quantum systems is an emerging field of physics. In particular, the possibility of light-driven superconductivity with ultrashort laser pulses has attr…
Terahertz electric-field driven dynamical multiferroicity in SrTiO
M. Basini, M. Pancaldi, B. Wehinger +5
The emergence of collective order in matter is among the most fundamental and intriguing phenomena in physics. In recent years, the ultrafast dynamical control and creation of nove…
Terahertz ionic Kerr effect: Two-phonon contribution to the nonlinear optical response in insulators
Martina Basini, Mattia Udina, Matteo Pancaldi +3
The THz Kerr effect measures the birefringence induced in an otherwise isotropic material by a strong THz pulse driving the Raman-active excitations of the systems. Here we provide…
Contribution of Collective Excitations to Third Harmonic Generation in Multiband Superconductors: the case of MgB
Jacopo Fiore, Mattia Udina, Marco Marciani +2
Multiband superconductors can host collective excitations with marked differences with respect to their single-band counterpart. We first study the spectrum of collective amplitude…
Terahertz displacive excitation of a coherent Raman-active phonon in VO
Flavio Giorgianni, Mattia Udina, Tommaso Cea +7
Nonlinear processes involving frequency-mixing of light fields set the basis for ultrafast coherent spectroscopy of collective modes in solids. In certain semimetals and semiconduc…
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…
Third harmonic generation from collective modes in disordered superconductors
G. Seibold, M. Udina, C. Castellani +1
Recent experiments with strong THz fields in both conventional and unconventional superconductors have clearly evidenced a marked third-harmonic generation below the superconductin…
Non-linear Terahertz Driving of Plasma Waves in Layered Cuprates
Francesco Gabriele, Mattia Udina, Lara Benfatto
The hallmark of superconductivity is the rigidity of the quantum-mechanical phase of electrons, responsible for superfluid behavior and Meissner effect. The strength of the phase s…
Raman response in the nematic phase of FeSe
Mattia Udina, Marco Grilli, Lara Benfatto +1
Raman experiments on bulk FeSe revealed that the low-frequency part of Raman response , which probes nematic fluctuations, rapidly decreases below the nematic…
Theory of coherent oscillations detection in THz pump-probe spectroscopy: from phonons to electronic collective modes
Mattia Udina, Tommaso Cea, Lara Benfatto
Time-resolved spectroscopies using intense THz pulses appear as a promising tool to address collective electronic excitations in condensed matter. In particular recent experiments…