Spin Waves and Dielectric Softening of Polar Molecule Condensates

Abstract

We consider an oblate Bose-Einstein condensate of heteronuclear polar molecules in a weak applied electric field. This system supports a rich quasiparticle spectrum that plays a critical role in determining its bulk dielectric properties. In particular, in sufficiently weak fields the system undergoes a polarization wave rotonization, leading to the development of textured electronic structure and a dielectric instability that is characteristic of the onset of a negative static dielectric function.

4+ pages, 3 figures

References in corpus (5)

• Theory of ultracold Fermi gases
• A High Phase-Space-Density Gas of Polar Molecules
• Radial and angular rotons in trapped dipolar gases
• Cold polar molecules in 2D traps: Tailoring interactions with external fields for novel quantum phases
• Anisotropic Polarizability of Ultracold Polar ${}^{40}$K${}^{87}$Rb Molecules

Cited by in corpus (3)

• Spinor Bose-Einstein Condensates of Rotating Polar Molecules
• Two-state Bogoliubov theory of a molecular Bose gas
• Bogoliubov theory of a Bose-Einstein condensate of rigid rotor molecules