Excited states of exciton-polariton condensates in 2D and 1D harmonic traps

Abstract

We present a theoretical description of Bogolyubov-type excitations of exciton-polariton Bose-Einstein condensates (BECs) in semiconductor microcavities. For a typical two dimensional (2D) BEC we focus on two limiting cases, the weak- and strong-coupling regimes, where a perturbation theory and the Thomas-Fermi approximation, respectively, are valid. We calculate integrated scattering intensity spectra for probing the collective excitations of the condensate in both considered limits. Moreover, in relation to recent experiments on optical modulation allowing localization of condensates in a trap with well controlled shape and dimensions, we study the quasi-one dimensional (1D) motion of the BEC in microwires and report the corresponding Bogolyubov's excitation spectrum. We show that in 1D case the characteristic polariton-polariton interaction constant is expressed as $g_1=3\lambda \mathcal{N}/(2L_y)$ ($\lambda$ is the 2D polariton-polaritons interaction parameter in the cavity, $\mathcal{N}$ the number of the particles, and $L_y$ the wirecavity width). We reveal some interesting features for 2D and 1D Bogolyubov spectra for both repulsive $(\lambda >0)$ and attractive $(\lambda <0)$ interaction.

12 pages, 6 figures

References in corpus (6)

• Quantum-fluid dynamics of microcavity polaritons
• Deviation from one-dimensionality in stationary properties and collisional dynamics of matter-wave solitons
• Energy Relaxation in a 1-D Polariton Condensate
• Light Engineering of the Polariton Landscape in Semiconductor Microcavities
• Kohn's Theorem, Larmor's Equivalence Principle and the Newton-Hooke Group
• Spectrum and thermal fluctuations of a microcavity polariton Bose-Einstein condensate

Cited by in corpus (1)

• Spin-orbit coupling and nonlinear modes of the polariton condensate in a harmonic trap