Collective modes of monolayer, bilayer, and multilayer fermionic dipolar liquid

TL;DR

This paper theoretically investigates the collective excitations in monolayer, bilayer, and multilayer 2D fermionic dipolar gases, highlighting their unique features compared to traditional electron systems with Coulomb interactions.

Contribution

It provides a comprehensive analysis of collective modes in 2D dipolar systems, including multilayer configurations, and compares them with Coulombic electron systems, advancing understanding of dipolar quantum gases.

Findings

Identified characteristic features of collective modes in 2D dipolar gases.

Compared dipolar modes with Coulombic electron systems, highlighting differences.

Analyzed effects of multilayer arrangements on collective excitations.

Abstract

Motivated by recent experimental advances in creating polar molecular gases in the laboratory, we theoretically investigate the many body effects of two-dimensional dipolar systems with the anisotropic and $1/r^3$ dipole-dipole interactions. We calculate collective modes of 2D dipolar systems, and also consider spatially separated bilayer and multilayer superlattice dipolar systems. We obtain the characteristic features of collective modes in quantum dipolar gases. We quantitatively compare the modes of these dipolar systems with the modes of the extensively studied usual two-dimensional electron systems, where the inter-particle interaction is Coulombic.