Static and dynamic properties of spin-orbit-coupled Bose-Einstein condensates

Martone, Giovanni Italo (2014) Static and dynamic properties of spin-orbit-coupled Bose-Einstein condensates. PhD thesis, University of Trento.

PDF - Doctoral Thesis


The recent realization of synthetic spin-orbit coupling represents an outstanding achievement in the physics of ultracold quantum gases. In this thesis we explore the properties of spin-orbit-coupled Bose-Einstein condensates with equal Rashba and Dresselhaus strengths. These systems present a rich phase diagram, which exhibits a tricritical point separating a single-minimum phase, a spin-polarized plane-wave phase, and a stripe phase. In the stripe phase translational invariance is spontaneously broken, in analogy with supersolids. Spin-orbit coupling also strongly affects the dynamics of the system. In particular, the excitation spectrum exhibits intriguing features, including the suppression of the sound velocity, the emergence of a roton minimum in the plane-wave phase, and the appearance of a double gapless band structure in the stripe phase. Finally, we discuss a combined procedure to make the stripes visible and stable, thus allowing for a direct experimental detection.

Item Type:Doctoral Thesis (PhD)
Doctoral School:Physics
PhD Cycle:27
Subjects:Area 02 - Scienze fisiche > FIS/02 FISICA TEORICA, MODELLI E METODI MATEMATICI
Area 02 - Scienze fisiche > FIS/03 FISICA DELLA MATERIA
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