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- W3209114744 abstract "We consider a BEC of rigid rotor molecules confined to quasi-2d through harmonic trapping. The molecules are subjected to an external electric field which polarizes the gas, and the molecules interact via dipole-dipole interactions. We present a description of the ground state and low-energy excitations of the system including an analysis of the mean-field energy, polarization, and stability. Under large electric fields the gas becomes fully polarized and we reproduce a well known density-wave instability which arises in polar BECs. Under smaller applied electric fields the gas develops an in-plane polarization leading to the emergence of a new global instability as the molecules tilt. The character of these instabilities is clarified by means of momentum-space density-density structure factors. A peak at zero momentum in the spin-spin structure factor for the in-plane component of the polarization indicates that the tilt instability is a global phonon-like instability." @default.
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- W3209114744 date "2021-10-29" @default.
- W3209114744 modified "2023-09-27" @default.
- W3209114744 title "Bogoliubov theory of a Bose-Einstein condensate of rigid rotor molecules" @default.
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- W3209114744 doi "https://doi.org/10.1088/1361-6455/ac34dd" @default.
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