ﻻ يوجد ملخص باللغة العربية
We study a rotating atomic Fermi gas near a narrow s-wave Feshbach resonance in a uniaxial harmonic trap with frequencies $Omega_perp$, $Omega_z$. Our primary prediction is the upper-critical angular velocity, $omega_{c2} (delta,T)$, as a function of temperature $T$ and resonance detuning $delta$, ranging across the BEC-BCS crossover. The rotation-driven suppression of superfluidity at $omega_{c2}$ is quite distinct in the BCS and BEC regimes, with the former controlled by Cooper-pair depairing and the latter by the dilution of bosonic molecules. At low $T$ and $Omega_zllOmega_perp$, in the BCS and crossover regimes of $0 lesssim delta lesssim delta_c$, $omega_{c2}$ is implicitly given by $hbar sqrt{omega_{c2}^2 +Omega_perp^2}approx 2Delta sqrt{hbar Omega_perp/epsilon_F}$, vanishing as $omega_{c2} simOmega_perp(1-delta/delta_c)^{1/2}$ near $delta_capprox 2epsilon_{F} + fracgamma 2epsilon_{F} ln(epsilon_F/hbarOmega_perp)$ (with $Delta$ the BCS gap and $gamma$ resonance width), and extending bulk result $hbaromega_{c2} approx 2Delta^2/epsilon_{F}$ to a finite number of atoms in a trap. In the BEC regime of $delta < 0$ we find $omega_{c2} toOmega^-_perp$, where molecular superfluidity can only be destroyed by large quantum fluctuations associated with comparable boson and vortex densities.
We study the expansion of a rotating, superfluid Fermi gas. The presence and absence of vortices in the rotating gas is used to distinguish superfluid and normal parts of the expanding cloud. We find that the superfluid pairs survive during the expan
Fermionic superfluidity requires the formation of pairs. The actual size of these fermion pairs varies by orders of magnitude from the femtometer scale in neutron stars and nuclei to the micrometer range in conventional superconductors. Many properti
We consider a weakly interacting two-component Fermi gas of dipolar particles (magnetic atoms or polar molecules) in the two-dimensional geometry. The dipole-dipole interaction (together with the short-range interaction at Feshbach resonances) for di
Quantum-degenerate Fermi gases provide a remarkable opportunity to study strongly interacting fermions. In contrast to other Fermi systems, such as superconductors, neutron stars or the quark-gluon plasma, these gases have low densities and their int
We investigate the lifetime of angular momentum in an ultracold strongly interacting Fermi gas, confined in a trap with controllable ellipticity. To determine the angular momentum we measure the precession of the radial quadrupole mode. We find that