امروز پنج شنبه , 22 شهریور 1403
شنبه تا پنج شنبه - 9 صبح الی 20 عصر
دانلود مقاله : Superfluidity and collective modes in Rashba spin–orbit coupled Fermi gases 2013
![دانلود مقاله : Superfluidity and collective modes in Rashba spin–orbit coupled Fermi gases 2013](/content/productpic/22324c8f05f79-1caa-4703-9db6-a59f6e41f793.png)
دانلود مقاله :
Superfluidity and collective modes in Rashba spin–orbit coupled Fermi gases 2013
نویسندگان :
Lianyi Hea , Xu-Guang Huang
فرمت:pdf
چکیده :
We present a theoretical study of the superfluidity and the corresponding
collective modes in two-component atomic Fermi gases
with s-wave attraction and synthetic Rashba spin–orbit coupling.
The general effective action for the collective modes is derived from
the functional path integral formalism. By tuning the spin–orbit
coupling from weak to strong, the system undergoes a crossover
from an ordinary BCS/BEC superfluid to a Bose–Einstein condensate
of rashbons. We show that the properties of the superfluid density
and the Anderson–Bogoliubov mode manifest this crossover.
At large spin–orbit coupling, the superfluid density and the sound
velocity become independent of the strength of the s-wave attraction.
The two-body interaction among the rashbons is also determined.
When a Zeeman field is turned on, the system undergoes
quantum phase transitions to some exotic superfluid phases which
are topologically nontrivial. For the two-dimensional system, the
nonanalyticities of the thermodynamic functions and the sound
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