The thesis analyze thermodynamic properties of a system of Fermions with a spin-orbit coupling, whose strength can be tuned continuously in a crossover from BCS theory of superconductivity to a Bose-Einstein condensate (BEC). Below the critical temperature $T_{c}$ both system are characterized by an order parameter. Generally a mean field approximation cannot reproduce the correct behavior of the critical temperature $T_{c}$ over the whole crossover; this happen instead if inclusions of quantum Gaussian fluctuations are considered. So the aim of the thesis is to study Gaussian fluctuations beyond mean field and to find the $T_{c}$ over the whole crossover also in the presence of a spin-orbit coupling.
Temperatura critica nel crossover BCS-BEC con accoppiamento spin-orbitale
Grava, Stefano
2016/2017
Abstract
The thesis analyze thermodynamic properties of a system of Fermions with a spin-orbit coupling, whose strength can be tuned continuously in a crossover from BCS theory of superconductivity to a Bose-Einstein condensate (BEC). Below the critical temperature $T_{c}$ both system are characterized by an order parameter. Generally a mean field approximation cannot reproduce the correct behavior of the critical temperature $T_{c}$ over the whole crossover; this happen instead if inclusions of quantum Gaussian fluctuations are considered. So the aim of the thesis is to study Gaussian fluctuations beyond mean field and to find the $T_{c}$ over the whole crossover also in the presence of a spin-orbit coupling.File | Dimensione | Formato | |
---|---|---|---|
tesi_LM_Grava_Stefano.pdf
accesso aperto
Dimensione
1.97 MB
Formato
Adobe PDF
|
1.97 MB | Adobe PDF | Visualizza/Apri |
The text of this website © Università degli studi di Padova. Full Text are published under a non-exclusive license. Metadata are under a CC0 License
https://hdl.handle.net/20.500.12608/25585