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Archivio digitale delle tesi discusse presso l’Università di Pisa

Tesi etd-02052018-103443


Tipo di tesi
Tesi di dottorato di ricerca
Autore
SIMONELLI, CRISTIANO
URN
etd-02052018-103443
Titolo
Dissipative and non-dissipative many-body physics with cold Rydberg atoms
Settore scientifico disciplinare
FIS/03
Corso di studi
FISICA
Relatori
tutor Dott. Morsch, Oliver
controrelatore Prof. Tonelli, Mauro
controrelatore Prof. Modugno, Giovanni
controrelatore Prof. Fortágh, József
controrelatore Prof. Sozzi, Marco
Parole chiave
  • cold gas
  • correlated dynamics
  • dissipative system
  • many-body system
  • out-of-equilibrium phase transition
  • percolation
  • Rydberg atoms
  • simulation
Data inizio appello
19/02/2018
Consultabilità
Completa
Riassunto
In this Thesis, I will report on the experiments performed during my Ph.D. in Pisa. The aim of the thesis is to explore the evolution of a many-body system in a dissipative regime. This can be done by the means of a cold ensemble of Rydberg atoms that, thanks to their peculiar properties, provides a versatile experimental platform to observe non-trivial dynamics of correlated excitations and new phase transitions. The Rydberg-Rydberg mechanical interaction is measured and a deexcitation technique is used to implement a state selective experimental protocol aimed at the measurement of the lifetime. Finally, we use our Rydberg atom system in the dissipative regime to implement a second order absorbing-state phase transition, which arises from the competition between two opposing processes: the correlated excitation and the spontaneous decay to the ground state. Clear signatures of the undergoing phase transition have been measured. These results pave the road for future investigations into the largely unexplored physics of nonequilibrium phase transitions in open many-body quantum systems.
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