Themistoklis Mavrogordatos


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Telefon 08-553 786 32
Besöksadress Roslagstullsbacken 21
Rum C5:3013
Postadress Fysikum 106 91 Stockholm


I urval från Stockholms universitets publikationsdatabas
  • 2019. C. Lledó, Themistoklis Mavrogordatos, M. H. Szymańska. Physical Review B 100 (5)

    We investigate the critical behavior of the open coherently-driven Bose-Hubbard dimer under nonlocal dissipation. A conserved quantity arises from the nonlocal nature of the dissipation, rendering the dimer multistable. In the weak-coupling semiclassical limit, the displayed criticality takes the form of amplitude bistability and breaking of spatial and temporal symmetries. A period-bistable time crystal is formed, consisting of Josephson-like oscillations. Mean-field dynamics and quantum trajectories complement the spectral analysis of the Liouvillian in the approach to the semiclassical limit.

  • 2019. Themistoklis K. Mavrogordatos. Physical Review A: covering atomic, molecular, and optical physics and quantum information 100 (3)

    We approach the strong-coupling thermodynamic limit in the response of the open driven Jaynes-Cummings (JC) oscillator. We do so by highlighting the role of quantum fluctuations against the semiclassical response in three distinct regimes of operation. We begin by demonstrating the persistence of photon blockade, predicted in Carmichael [Phys. Rev. X 5, 031028 (2015)], as a manifestation of the inherently quantum and nonlinear JC spectrum revealed for vanishing dissipation. We then proceed to discuss the importance of bistability, which, despite being present in photon blockades, is able to provide an alignment between the semiclassical nonlinearity and quantum dynamics only for a driving amplitude having the same order of magnitude as the light-matter coupling strength. This resolution brings us to the critical point of the well-known quantum-phase transition of second order on resonance, where the quantum and semiclassical pictures are once more contrasted for a varying participation of the two coherent interactions when going through the collapse of the quasienergy spectrum.

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Senast uppdaterad: 30 september 2020

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