Berlin 2015 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 107: Microcavities, polaritons and condensates
HL 107.3: Vortrag
Freitag, 20. März 2015, 10:45–11:00, EW 015
The Structure of Polariton Macroscopic Quantum Phases in 2D Acoustic Lattices — •Jakov V. Buller1, Edgar A. Cerda-Mendez1, Raul E. Balderas-Navarro1, 2, Klaus Biermann1, Dmitry N. Krizhanovskii3, Maurice S. Skolnick3, and Paulo V. Santos1 — 1Paul-Drude-Institut für Festkörperelektronik, 10117 Berlin, Germany — 2Instituto de Investigación en Comunicación Óptica, 78000 San Luis Potosí, México — 3University of Sheffield, Sheffield S37RH, United Kingdom
Exciton-polaritons are bosonic light-matter quasiparticles that result from the strong coupling of photon modes and quantum well excitons in a semiconductor microcavity. Due to their excitonic component, they show strong non-linear interactions, while their photonic component leads to very low effective masses and thus, formation of macroscopic quantum phases (MQPs) at kelvin temperatures. Also, their μm-long de Broglie wavelength allows modulation by micrometric acoustic potentials.
In this work, we present experimental results on the structure of polariton MQPs in tunable 2D acoustic lattices created by surface acoustic waves. The studies are carried out by a tomographic imaging technique, which gives energy-resolved information on the momentum- and real-space structure. The results show that MQPs with different symmetries, spatial distributions and coherence lengths coexist within the excitation laser spot. This work opens the way for the study of lattice vortex solitons and other polariton MQPs such as a Bose glass.