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arXiv · 2001.01309

Observation of Algebraic Time Order for Two-Dimensional Dipolar Excitons

S. Dang·M. Zamorano·S. Suffit·K. West·K. Baldwin·L. Pfeiffer·M. Holzmann·F. Dubin
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Abstract

Emergence of algebraic quasi-long-range order is a key feature of superfluid phase transitions at two dimensions. For this reduced dimensionality interactions prevent Bose-Einstein condensation with true long range order, at any finite temperature. Here, we report the occurence of algebraic order in a strongly interacting quantum liquid formed by dipolar excitons confined in a bilayer semiconductor heterostructure. We observe a transition from exponential to algebraic decay of the excitons temporal coherence, accompanied by a universal scaling behaviour of the equation of state. Our results provide strong evidence for a Berezinskii-Kosterlitz-Thouless (BKT) transition in a multi-component boson-like system governed by strong dipolar interactions.

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S. Dang, M. Zamorano, S. Suffit, K. West, K. Baldwin, L. Pfeiffer, M. Holzmann, F. Dubin. 2020-01-05. Observation of Algebraic Time Order for Two-Dimensional Dipolar Excitons. https://doi.org/10.1103/physrevresearch.2.032013

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