Cangemi, Loris Maria (2020) Environmental effects on dynamics and topological features of quantum systems. [Tesi di dottorato]

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Tipologia del documento: Tesi di dottorato
Lingua: English
Titolo: Environmental effects on dynamics and topological features of quantum systems.
Autori:
AutoreEmail
Cangemi, Loris Marialorismaria.cangemi@unina.it
Data: 13 Marzo 2020
Numero di pagine: 143
Istituzione: Università degli Studi di Napoli Federico II
Dipartimento: Fisica
Dottorato: Fisica
Ciclo di dottorato: 32
Coordinatore del Corso di dottorato:
nomeemail
Capozziello, Salvatore[non definito]
Tutor:
nomeemail
Cataudella, Vittorio[non definito]
De Filippis, Giulio[non definito]
Data: 13 Marzo 2020
Numero di pagine: 143
Parole chiave: Open quantum systems, interacting topological systems.
Settori scientifico-disciplinari del MIUR: Area 02 - Scienze fisiche > FIS/03 - Fisica della materia
Depositato il: 31 Mar 2020 16:18
Ultima modifica: 28 Ott 2021 08:10
URI: http://www.fedoa.unina.it/id/eprint/13041

Abstract

Theoretical models of quantum systems in the presence of their environment find many applications, ranging from condensed matter physics to quantum information science and quantum thermodynamics. In the field of macroscopic quantum systems, the Caldeira-Leggett model has been employed to study the effects of thermal baths on the coherence properties of superconducting qubits. However, if the quantum system of interest consists of many electrons in a solid, the role of the environment can be played by a quantum field of lattice vibrations, i.e. phonons, modeled by means of noninteracting bosons . In this work, we studied widely known models of quantum systems linearly coupled to their bosonic environment, ranging from simple driven two-level systems, i.e. qubits, to many electrons systems. Our approach has been focused on interesting model parameter ranges where well-established weak-coupling approximations fail in describing the physics involved. Indeed, these regimes are interesting and accessible to experiments. In the case of a driven qubit in contact with its environment, strong coupling effects in system-bath interactions, decoherence and crossover to totally incoherent tunneling dynamics have been studied. In addition, by considering prototypical models of fermionic systems strongly coupled to phonons on a lattice, we studied how topological features can be dramatically modified in the presence of electron-phonon interaction.

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