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Atomic and Laser Physics
Credit: Jack Hobhouse

Andrea Cavalleri

Professor of Physics

Sub department

  • Atomic and Laser Physics
andrea.cavalleri@physics.ox.ac.uk
Telephone: 01865 (2)72365
Clarendon Laboratory, room 316.3
  • About
  • Publications

Dynamics of photoinduced ferromagnetism in oxides with orbital degeneracy

Physical Review Research American Physical Society (APS) 5:1 (2023) 013204

Authors:

Jonathan B Curtis, Ankit Disa, Michael Fechner, Andrea Cavalleri, Prineha Narang
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Two-fluid dynamics in driven YBa2Cu3O6.48

Physical Review B American Physical Society (APS) 107:10 (2023) 104508

Authors:

A Ribak, M Buzzi, D Nicoletti, R Singla, Y Liu, S Nakata, B Keimer, A Cavalleri
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In-Situ Observation of the Formation of Laser-Induced Periodic Surface Structures with Extreme Spatial and Temporal Resolution

Chapter in Ultrafast Laser Nanostructuring, Springer Nature 239 (2023) 257-276

Authors:

Klaus Sokolowski-Tinten, Jörn Bonse, Anton Barty, Henry N Chapman, Saša Bajt, Mike J Bogan, Sebastien Boutet, Andrea Cavalleri, Stefan Düsterer, Matthias Frank, Janos Hajdu, Stefan Hau-Riege, Stefano Marchesini, Nikola Stojanovic, Rolf Treusch
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Periodic dynamics in superconductors induced by an impulsive optical quench

Communications Physics Springer Nature 5:1 (2022) 234

Authors:

Pavel E Dolgirev, Alfred Zong, Marios H Michael, Jonathan B Curtis, Daniel Podolsky, Andrea Cavalleri, Eugene Demler

Abstract:

A number of experiments have evidenced signatures of enhanced superconducting correlations after photoexcitation. Initially, these experiments were interpreted as resulting from quasi-static changes in the Hamiltonian parameters, for example, due to lattice deformations or melting of competing phases. Yet, several recent observations indicate that these conjectures are either incorrect or do not capture all the observed phenomena, which include reflectivity exceeding unity, large shifts of Josephson plasmon edges, and appearance of new peaks in terahertz reflectivity. These observations can be explained from the perspective of a Floquet theory involving a periodic drive of system parameters, but the origin of the underlying oscillations remains unclear. In this paper, we demonstrate that following incoherent photoexcitation, long-lived oscillations are generally expected in superconductors with low-energy Josephson plasmons, such as in cuprates or fullerene superconductor K3C60. These oscillations arise from the parametric generation of plasmon pairs due to pump-induced perturbation of the superconducting order parameter. We show that this bi-plasmon response can persist even above the transition temperature as long as strong superconducting fluctuations are present. Our analysis offers a robust framework to understand light-induced superconducting behavior, and the predicted bi-plasmon oscillations can be directly detected using available experimental techniques.

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Coherent emission from surface Josephson plasmons in striped cuprates

Proceedings of the National Academy of Sciences National Academy of Sciences 119:39 (2022) e2211670119

Authors:

D Nicoletti, M Buzzi, M Fechner, Pe Dolgirev, Mh Michael, Jb Curtis, E Demler, Gd Gu, A Cavalleri

Abstract:

The interplay between charge order and superconductivity remains one of the central themes of research in quantum materials. In the case of cuprates, the coupling between striped charge fluctuations and local electromagnetic fields is especially important, as it affects transport properties, coherence, and dimensionality of superconducting correlations. Here, we study the emission of coherent terahertz radiation in single-layer cuprates of the La2-xBaxCuO4 family, for which this effect is expected to be forbidden by symmetry. We find that emission vanishes for compounds in which the stripes are quasi-static but is activated when c-axis inversion symmetry is broken by incommensurate or fluctuating charge stripes, such as in La1.905Ba0.095CuO4 and in La1.845Ba0.155CuO4. In this case, terahertz radiation is emitted by surface Josephson plasmons, which are generally dark modes, but couple to free space electromagnetic radiation because of the stripe modulation.

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