Search Results - "Hammack, A. T"

Moiré pattern of interference dislocations in condensate of indirect excitons by Leonard, J. R., Hu, Lunhui, High, A. A., Hammack, A. T., Wu, Congjun, Butov, L. V., Campman, K. L., Gossard, A. C.

“…Interference patterns provide direct measurement of coherent propagation of matter waves in quantum systems. Superfluidity in Bose–Einstein condensates of…”
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Excitonic switches operating at around 100 K by High, A. A, Grosso, G, Graves, J, Hammack, A. T, Butov, L. V, Hanson, M, Gossard, A. C

“…Photonic and optoelectronic devices may offer the opportunity to realize efficient signal processing at speeds higher than in conventional electronic devices…”
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Pancharatnam–Berry phase in condensate of indirect excitons by Leonard, J. R., High, A. A., Hammack, A. T., Fogler, M. M., Butov, L. V., Campman, K. L., Gossard, A. C.

“…The Pancharatnam–Berry phase is a geometric phase acquired over a cycle of parameters in the Hamiltonian governing the evolution of the system. Here, we report…”
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Localization-delocalization transition of indirect excitons in lateral electrostatic lattices by Remeika, M, Graves, J C, Hammack, A T, Meyertholen, A D, Fogler, M M, Butov, L V, Hanson, M, Gossard, A C

“…We study transport of indirect excitons in GaAs/AlGaAs coupled quantum wells in linear lattices created by laterally modulated gate voltage. The…”
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Origin of the inner ring in photoluminescence patterns of quantum well excitons by Ivanov, A. L, Smallwood, L. E, Hammack, A. T, Yang, Sen, Butov, L. V, Gossard, A. C

“…In order to explain and model the inner ring in photoluminescence (PL) patterns of indirect excitons in GaAs/AlGaAs quantum wells (QWs), we develop a…”
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Indirect Excitons in Elevated Traps by High, A. A, Hammack, A. T, Butov, L. V, Mouchliadis, L, Ivanov, A. L, Hanson, M, Gossard, A. C

“…We report on the study of indirect excitons in elevated traps. The transition from a normal to elevated trap results in the appearance of narrow lines in the…”
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Spontaneous coherence in a cold exciton gas by High, A. A., Leonard, J. R., Hammack, A. T., Fogler, M. M., Butov, L. V., Kavokin, A. V., Campman, K. L., Gossard, A. C.

“…In theory, excitons can form a coherent state like a Bose–Einstein condensate, but this is difficult to produce; it is now shown that spontaneous coherence,…”
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Spin currents in a coherent exciton gas by High, A A, Hammack, A T, Leonard, J R, Yang, Sen, Butov, L V, Ostatnický, T, Vladimirova, M, Kavokin, A V, Liew, T C H, Campman, K L, Gossard, A C

“…We report the observation of spin currents in a coherent gas of indirect excitons. The realized long-range spin currents originate from the formation of a…”
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Electrostatic conveyer for excitons by Winbow, A G, Leonard, J R, Remeika, M, Kuznetsova, Y Y, High, A A, Hammack, A T, Butov, L V, Wilkes, J, Guenther, A A, Ivanov, A L, Hanson, M, Gossard, A C

“…We report on the study of indirect excitons in moving lattices-conveyers created by a set of ac voltages applied to the electrodes on the sample surface. The…”
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Coherence length of cold exciton gases in coupled quantum wells by Yang, Sen, Hammack, A T, Fogler, M M, Butov, L V, Gossard, A C

“…A Mach-Zehnder interferometer with spatial and spectral resolution was used to probe spontaneous coherence in cold exciton gases, which are implemented…”
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Trapping indirect excitons in a GaAs quantum-well structure with a diamond-shaped electrostatic trap by High, A A, Thomas, A K, Grosso, G, Remeika, M, Hammack, A T, Meyertholen, A D, Fogler, M M, Butov, L V, Hanson, M, Gossard, A C

“…We report on the principle and realization of a new trap for excitons--the diamond electrostatic trap--which uses a single electrode to create a confining…”
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Trapping of cold excitons in quantum well structures with laser light by Hammack, A T, Griswold, M, Butov, L V, Smallwood, L E, Ivanov, A L, Gossard, A C

“…Optical trapping and manipulation of neutral particles has led to a variety of experiments from stretching DNA-molecules to trapping and cooling of neutral…”
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Pattern formation in the exciton inner ring by Remeika, M., Hammack, A. T., Poltavtsev, S. V., Butov, L. V., Wilkes, J., Ivanov, A. L., Campman, K. L., Hanson, M., Gossard, A. C.

“…We report on the two-beam study of indirect excitons in the inner ring in the exciton emission pattern. One laser beam generates the inner ring and a second…”
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Pancharatnam-Berry phase in condensate of indirect excitons by Leonard, J. R, High, A. A, Hammack, A. T, Fogler, M. M, Butov, L. V, Campman, K. L, Gossard, A. C

“…Nature Communications 9, 2158 (2018) We report on the observation of the Pancharatnam-Berry phase in a condensate of indirect excitons (IXs) in a GaAs coupled…”
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Kinetics of the inner ring in the exciton emission pattern in coupled GaAs quantum wells by Hammack, A. T., Butov, L. V., Wilkes, J., Mouchliadis, L., Muljarov, E. A., Ivanov, A. L., Gossard, A. C.

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Pattern Formation in the Exciton Inner Ring by Remeika, M, Hammack, A. T, Poltavtsev, S, Butov, L. V, Wilkes, J, Ivanov, A. L, Campman, K. L, Hanson, M, Gossard, A. C

“…Phys. Rev. B 88, 125307 (2013) We report on the spatially separated pump-probe study of indirect excitons in the inner ring in the exciton emission pattern. A…”
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Kinetics of indirect excitons in an optically induced trap in GaAs quantum wells by Hammack, A. T., Butov, L. V., Mouchliadis, L., Ivanov, A. L., Gossard, A. C.

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Spin currents in a coherent exciton gas by High, A. A, Hammack, A. T, Leonard, J. R, Yang, Sen, Butov, L. V, Ostatnicky, T, Vladimirova, M, Kavokin, A. V, Liew, T. C. H, Campman, K. L, Gossard, A. C

“…Phys. Rev. Lett. 110, 246403 (2013) Spin currents and spin textures are observed in a coherent gas of indirect excitons. Applied magnetic fields bend the spin…”
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Spin Texture in a Cold Exciton Gas by High, A. A, Hammack, A. T, Leonard, J. R, Yang, Sen, Butov, L. V, Ostatnicky, T, Kavokin, A. V, Gossard, A. C

“…Phys. Rev. Lett. 110, 246403 (2013) We report on the observation of a spin texture in a cold exciton gas in a GaAs/AlGaAs coupled quantum well structure. The…”
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Excitonic switches operating at around 100 K by Grosso, G, Graves, J C, Hammack, A T, High, A A, Butov, L V, Hanson, M, Gossard, A C

“…We report on experimental proof of principle for the operation of excitonic switches at temperatures around 100 K. The devices include the exciton…”
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