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  • 1
    Publication Date: 2013-06-12
    Description: Author(s): A. A. High, A. T. Hammack, J. R. Leonard, Sen Yang, L. V. Butov, T. Ostatnický, M. Vladimirova, A. V. Kavokin, T. C. H. Liew, K. L. Campman, and A. C. Gossard 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 coherent gas of bosonic pairs—a new mechanism to suppress the spin relaxation. The spin currents result in the appearance of a variety of polariz... [Phys. Rev. Lett. 110, 246403] Published Tue Jun 11, 2013
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 2
    Publication Date: 2015-03-31
    Description: Author(s): P. Andreakou, S. Cronenberger, D. Scalbert, A. Nalitov, N. A. Gippius, A. V. Kavokin, M. Nawrocki, J. R. Leonard, L. V. Butov, K. L. Campman, A. C. Gossard, and M. Vladimirova Indirect excitons in coupled quantum wells are long-living quasiparticles, explored in the studies of collective quantum states. We demonstrate that, despite the extremely low oscillator strength, their spin and population dynamics can by addressed by time-resolved pump-probe spectroscopy. Our exper... [Phys. Rev. B 91, 125437] Published Mon Mar 30, 2015
    Keywords: Surface physics, nanoscale physics, low-dimensional systems
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 3
    Publication Date: 2011-05-13
    Description: Author(s): A. G. Winbow, J. R. Leonard, M. Remeika, Y. Y. Kuznetsova, A. A. High, A. T. Hammack, L. V. Butov, J. Wilkes, A. A. Guenther, A. L. Ivanov, M. Hanson, and A. C. Gossard 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 wavelength of this moving lattice is set by the electrode periodicity, the amplitude is controlled by the applied voltage, and the velocity ... [Phys. Rev. Lett. 106, 196806] Published Thu May 12, 2011
    Keywords: Condensed Matter: Electronic Properties, etc.
    Print ISSN: 0031-9007
    Electronic ISSN: 1079-7114
    Topics: Physics
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  • 4
    Publication Date: 2015-01-10
    Description: We demonstrate experimental proof of principle for a stirring potential for indirect excitons. The azimuthal wavelength of this stirring potential is set by the electrode periodicity, the amplitude is controlled by the applied AC voltage, and the angular velocity is controlled by the AC frequency.
    Print ISSN: 0021-8979
    Electronic ISSN: 1089-7550
    Topics: Physics
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  • 5
    Publication Date: 2015-09-29
    Description: Author(s): M. Remeika, J. R. Leonard, C. J. Dorow, M. M. Fogler, L. V. Butov, M. Hanson, and A. C. Gossard The authors demonstrate a means to determine the strength of excitonic correlations (as measured by the photoluminescence energy shift) of indirect excitons in semiconductor quantum wells. Because this energy shift is determined by how the excitons respond to an external potential, the authors apply an electrostatic periodic potential to the excitonic gas. By measuring the corresponding excitonic response due to this applied potential, they, using a complementary theory, are able to deduce the strength of correlations. [Phys. Rev. B 92, 115311] Published Mon Sep 28, 2015
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 6
    Publication Date: 2016-02-18
    Description: We report on the principle and realization of an excitonic device: a ramp that directs the transport of indirect excitons down a potential energy gradient created by a perforated electrode at a constant voltage. The device provides an experimental proof of principle for controlling exciton transport with electrode density gradients. We observed that the exciton transport distance along the ramp increases with increasing exciton density. This effect is explained in terms of disorder screening by repulsive exciton-exciton interactions.
    Print ISSN: 0003-6951
    Electronic ISSN: 1077-3118
    Topics: Physics
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  • 7
    Publication Date: 2012-03-23
    Description: If bosonic particles are cooled down below the temperature of quantum degeneracy, they can spontaneously form a coherent state in which individual matter waves synchronize and combine. Spontaneous coherence of matter waves forms the basis of a number of fundamental phenomena in physics, including superconductivity, superfluidity and Bose-Einstein condensation. Spontaneous coherence is the key characteristic of condensation in momentum space. Excitons--bound pairs of electrons and holes--form a model system to explore the quantum physics of cold bosons in solids. Cold exciton gases can be realized in a system of indirect excitons, which can cool down below the temperature of quantum degeneracy owing to their long lifetimes. Here we report measurements of spontaneous coherence in a gas of indirect excitons. We found that spontaneous coherence of excitons emerges in the region of the macroscopically ordered exciton state and in the region of vortices of linear polarization. The coherence length in these regions is much larger than in a classical gas, indicating a coherent state with a much narrower than classical exciton distribution in momentum space, characteristic of a condensate. A pattern of extended spontaneous coherence is correlated with a pattern of spontaneous polarization, revealing the properties of a multicomponent coherent state. We also observed phase singularities in the coherent exciton gas. All these phenomena emerge when the exciton gas is cooled below a few kelvin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉High, A A -- Leonard, J R -- Hammack, A T -- Fogler, M M -- Butov, L V -- Kavokin, A V -- Campman, K L -- Gossard, A C -- England -- Nature. 2012 Mar 21;483(7391):584-8. doi: 10.1038/nature10903.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, University of California at San Diego, La Jolla, California 92093-0319, USA. alex.high@gmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22437498" target="_blank"〉PubMed〈/a〉
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 8
    Publication Date: 2012-07-27
    Description: Medulloblastoma, the most common malignant paediatric brain tumour, is currently treated with nonspecific cytotoxic therapies including surgery, whole-brain radiation, and aggressive chemotherapy. As medulloblastoma exhibits marked intertumoural heterogeneity, with at least four distinct molecular variants, previous attempts to identify targets for therapy have been underpowered because of small samples sizes. Here we report somatic copy number aberrations (SCNAs) in 1,087 unique medulloblastomas. SCNAs are common in medulloblastoma, and are predominantly subgroup-enriched. The most common region of focal copy number gain is a tandem duplication of SNCAIP, a gene associated with Parkinson's disease, which is exquisitely restricted to Group 4alpha. Recurrent translocations of PVT1, including PVT1-MYC and PVT1-NDRG1, that arise through chromothripsis are restricted to Group 3. Numerous targetable SCNAs, including recurrent events targeting TGF-beta signalling in Group 3, and NF-kappaB signalling in Group 4, suggest future avenues for rational, targeted therapy.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3683624/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3683624/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Northcott, Paul A -- Shih, David J H -- Peacock, John -- Garzia, Livia -- Morrissy, A Sorana -- Zichner, Thomas -- Stutz, Adrian M -- Korshunov, Andrey -- Reimand, Juri -- Schumacher, Steven E -- Beroukhim, Rameen -- Ellison, David W -- Marshall, Christian R -- Lionel, Anath C -- Mack, Stephen -- Dubuc, Adrian -- Yao, Yuan -- Ramaswamy, Vijay -- Luu, Betty -- Rolider, Adi -- Cavalli, Florence M G -- Wang, Xin -- Remke, Marc -- Wu, Xiaochong -- Chiu, Readman Y B -- Chu, Andy -- Chuah, Eric -- Corbett, Richard D -- Hoad, Gemma R -- Jackman, Shaun D -- Li, Yisu -- Lo, Allan -- Mungall, Karen L -- Nip, Ka Ming -- Qian, Jenny Q -- Raymond, Anthony G J -- Thiessen, Nina T -- Varhol, Richard J -- Birol, Inanc -- Moore, Richard A -- Mungall, Andrew J -- Holt, Robert -- Kawauchi, Daisuke -- Roussel, Martine F -- Kool, Marcel -- Jones, David T W -- Witt, Hendrick -- Fernandez-L, Africa -- Kenney, Anna M -- Wechsler-Reya, Robert J -- Dirks, Peter -- Aviv, Tzvi -- Grajkowska, Wieslawa A -- Perek-Polnik, Marta -- Haberler, Christine C -- Delattre, Olivier -- Reynaud, Stephanie S -- Doz, Francois F -- Pernet-Fattet, Sarah S -- Cho, Byung-Kyu -- Kim, Seung-Ki -- Wang, Kyu-Chang -- Scheurlen, Wolfram -- Eberhart, Charles G -- Fevre-Montange, Michelle -- Jouvet, Anne -- Pollack, Ian F -- Fan, Xing -- Muraszko, Karin M -- Gillespie, G Yancey -- Di Rocco, Concezio -- Massimi, Luca -- Michiels, Erna M C -- Kloosterhof, Nanne K -- French, Pim J -- Kros, Johan M -- Olson, James M -- Ellenbogen, Richard G -- Zitterbart, Karel -- Kren, Leos -- Thompson, Reid C -- Cooper, Michael K -- Lach, Boleslaw -- McLendon, Roger E -- Bigner, Darell D -- Fontebasso, Adam -- Albrecht, Steffen -- Jabado, Nada -- Lindsey, Janet C -- Bailey, Simon -- Gupta, Nalin -- Weiss, William A -- Bognar, Laszlo -- Klekner, Almos -- Van Meter, Timothy E -- Kumabe, Toshihiro -- Tominaga, Teiji -- Elbabaa, Samer K -- Leonard, Jeffrey R -- Rubin, Joshua B -- Liau, Linda M -- Van Meir, Erwin G -- Fouladi, Maryam -- Nakamura, Hideo -- Cinalli, Giuseppe -- Garami, Miklos -- Hauser, Peter -- Saad, Ali G -- Iolascon, Achille -- Jung, Shin -- Carlotti, Carlos G -- Vibhakar, Rajeev -- Ra, Young Shin -- Robinson, Shenandoah -- Zollo, Massimo -- Faria, Claudia C -- Chan, Jennifer A -- Levy, Michael L -- Sorensen, Poul H B -- Meyerson, Matthew -- Pomeroy, Scott L -- Cho, Yoon-Jae -- Bader, Gary D -- Tabori, Uri -- Hawkins, Cynthia E -- Bouffet, Eric -- Scherer, Stephen W -- Rutka, James T -- Malkin, David -- Clifford, Steven C -- Jones, Steven J M -- Korbel, Jan O -- Pfister, Stefan M -- Marra, Marco A -- Taylor, Michael D -- AT1-112286/Canadian Institutes of Health Research/Canada -- CA116804/CA/NCI NIH HHS/ -- CA138292/CA/NCI NIH HHS/ -- CA159859/CA/NCI NIH HHS/ -- CA86335/CA/NCI NIH HHS/ -- K08 NS059790/NS/NINDS NIH HHS/ -- P20 CA151129/CA/NCI NIH HHS/ -- P30 CA138292/CA/NCI NIH HHS/ -- P30 HD018655/HD/NICHD NIH HHS/ -- P41 GM103504/GM/NIGMS NIH HHS/ -- R01 CA086335/CA/NCI NIH HHS/ -- R01 CA109467/CA/NCI NIH HHS/ -- R01 CA114567/CA/NCI NIH HHS/ -- R01 CA116804/CA/NCI NIH HHS/ -- R01 CA148621/CA/NCI NIH HHS/ -- R01 CA155360/CA/NCI NIH HHS/ -- R01 CA159859/CA/NCI NIH HHS/ -- R01 CA163737/CA/NCI NIH HHS/ -- R01 NS061070/NS/NINDS NIH HHS/ -- England -- Nature. 2012 Aug 2;488(7409):49-56. doi: 10.1038/nature11327.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Developmental & Stem Cell Biology Program, The Hospital for Sick Children, Toronto, Ontario M5G 1L7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/22832581" target="_blank"〉PubMed〈/a〉
    Keywords: Carrier Proteins/genetics ; Cerebellar Neoplasms/*classification/*genetics/metabolism ; Child ; DNA Copy Number Variations/genetics ; Gene Duplication/genetics ; Genes, myc/genetics ; Genome, Human/*genetics ; Genomic Structural Variation/*genetics ; Genomics ; Hedgehog Proteins/metabolism ; Humans ; Medulloblastoma/*classification/*genetics/metabolism ; NF-kappa B/metabolism ; Nerve Tissue Proteins/genetics ; Oncogene Proteins, Fusion/genetics ; Proteins/genetics ; RNA, Long Noncoding ; Signal Transduction ; Transforming Growth Factor beta/metabolism ; Translocation, Genetic/genetics
    Print ISSN: 0028-0836
    Electronic ISSN: 1476-4687
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
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  • 9
    Publication Date: 2013-11-22
    Description: Author(s): A. V. Kavokin, M. Vladimirova, B. Jouault, T. C. H. Liew, J. R. Leonard, and L. V. Butov Traditional spintronics relies on spin transport by charge carriers, such as electrons in semiconductor crystals. The challenges for the realization of long-range electron spin transport include rapid spin relaxation due to electron scattering. Scattering and, in turn, spin relaxation can be effecti... [Phys. Rev. B 88, 195309] Published Thu Nov 21, 2013
    Keywords: Semiconductors II: surfaces, interfaces, microstructures, and related topics
    Print ISSN: 1098-0121
    Electronic ISSN: 1095-3795
    Topics: Physics
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  • 10
    Publication Date: 2018-06-05
    Description: Pancharatnam–Berry phase in condensate of indirect excitons Pancharatnam–Berry phase in condensate of indirect excitons, Published online: 04 June 2018; doi:10.1038/s41467-018-04667-x Geometric phases in matter are of fundamental interest. Here the authors observe the Pancharatnam–Berry phase in matter waves by imaging light interference patterns from cold gases of indirect excitons and find long-range coherent spin transport in the system.
    Electronic ISSN: 2041-1723
    Topics: Biology , Chemistry and Pharmacology , Natural Sciences in General , Physics
    Published by Springer Nature
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