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COLD DIPOLAR EXCITONS ON A CHIP FROM FUNDAMENTAL MANY-BODY PHYSICS TO MULTI-FUNCTIONAL CIRCUITRY Ronen Rapaport The Racah Institute of Physics and the School of Engineering, The Hebrew University of Jerusalem SAW SAW 1 SAW 2

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The nanophotonics group Yehiel Shilo Kobi Cohen Ronen Rapaport Boris Laikhtman Loren Pfeiffer Ken West Paulo Santos Snezana Lazic Adriano Violante Rudolph Hey

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The nanophotonics group Outline Fundamental aspects: I - experiments on trapped dipolar excitons evidence for strong particle correlations, dark excitons condensate Dipolar exciton functional devices: II - Demonstration of an exciton acoustic multiplexer circuit III (not presented) - Remote dipolar interactions

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The nanophotonics group Dipolar excitons in semiconductor bilayers + ++ --- z d d Energy z - + CB VB AlGaAs GaAs - + - + - + - + z AlGaAs GaAs - + - + - + - + Energy z CB VB - + - + CB VB V eV

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The nanophotonics group dipolar excitons ++ -- r + ++ --- z d V 2D dipolar fluid aligned dipoles repulsive interaction Boson quasi-particles (integer spin) Bose fluid at low T (

The nanophotonics group beyond mean field prediction- dipolar correlations! Two correlation regimes T>2.5K E int Mean field prediction T dependent regime T independent

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The nanophotonics group r0r0 Balance between quantum motion and repulsion Lower T: r 0 < T - Quantum correlations High T: r 0 > T - Classical correlations Balance between thermal motion and repulsion Temperature dependence No temperature dependence

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The nanophotonics group Deviation from thermal distribution below ~2.5K Missing particles!

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The nanophotonics group less bright excitons missing particles Dark exciton (S=2) accumulation (condensation)? (S=2) (S=1)