Rapidly rotating fermions in an anisotropic trap |
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Authors: | N?Ghazanfari M ??Oktel |
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Institution: | 1.Department of Physics,Middle East Technical University,Ankara,Turkey;2.Department of Physics,Bilkent University,Ankara,Turkey |
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Abstract: | We consider a cold gas of non-interacting fermions in a
two-dimensional harmonic trap with two different trapping
frequencies wx\omega_x
≤
wy\omega_y, and discuss the effect of
rotation on the density profile. Depending on the rotation frequency
Ω, and the trap anisotropy wy\omega_y/wx\omega_x, the density
profile assumes two qualitatively different shapes. For small
anisotropy, the density consists of elliptical plateaus of constant
density, corresponding to Landau levels and is well described by a
two-dimensional local density approximation. For large anisotropy,
the density profile is Gaussian in the strong confining direction
and semicircular with prominent Friedel oscillations in the weak
direction. In this regime, a one-dimensional local density
approximation is well suited to describe the system. The crossover
between the two regimes is smooth where the step structure between
the Landau level edges turn into Friedel oscillations. |
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Keywords: | |
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