Optical conductivity of Bose droplets in quenched disorder at T = 0: the effects of structure factor

TL;DR

This paper investigates how the internal charge structure of Bose droplets influences their optical conductivity in disordered environments, revealing complex oscillations and a higher disorder threshold for glass transition.

Contribution

It introduces a mode-coupling theory model for Bose droplets with internal charge structure interacting with impurities, highlighting differences from structureless particles.

Findings

Glass transition occurs at stronger disorder for structured droplets.

Optical conductivity shows complex oscillating patterns.

Model applicable to IR conductivity in doped cuprates.

Abstract

The optical response of a system of two-dimensional Bose condensate droplets with an internal charge structure interacting with impurities is considered within the mode-coupling theory. It is found, that the glass transition in the system of droplets occurs at much stronger disorder as compared to the case of stuctureless point particles. The optical conductivity of the system is found to exhibit a complex oscillating structure, intimately related to the charge distribution within the droplets. The application of the model to the problem of the far IR optical conductivity of doped cuprates (in particular, La214) is discussed.