Macroscopically ordered state in exciton system
L.V. Butov (1, 2), A.C. Gossard (3), and D.S. Chemla (1, 4) ((1), Materials Sciences Division, E.O. Lawrence Berkeley National Laboratory, (2), Institute of Solid State Physics, Russian Academy of Sciences, (3) Department, of Electrical, Computer Engineering
TL;DR
This paper reports the experimental discovery of a macroscopically ordered state in an exciton system, demonstrating quantum liquid behavior and potential Bose-Einstein condensation in semiconductors.
Contribution
First experimental observation of macroscopic ordering in an exciton quantum liquid within semiconductors.
Findings
Observation of macroscopically ordered exciton state
Evidence supporting exciton Bose-Einstein condensation
Demonstration of quantum liquid behavior in semiconductor excitons
Abstract
Macroscopically ordered arrays of vortices in quantum liquids, such as superconductors, He-II, and atom Bose-Einstein Condensates (BEC), demonstrate macroscopic coherence in flowing superfluids [1-4]. Despite of the rich variety of systems where quantum liquids reveal macroscopic ordering, experimental observation of a macroscopically ordered electronic state in semiconductors has remained a challenging unexplored problem. A system of excitons is a promising candidate for the realization of macroscopic ordering in a quantum liquid in semiconductors. An exciton is a bound pair of an electron and a hole. At low densities, it is a Bose quasi-particle. At low temperatures, of the order of a few Kelvins, excitons can form a quantum liquid, i.e., a statistically degenerate Bose gas and eventually BEC [5-9]. Here, we report the experimental observation of a macroscopically ordered state in an…
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