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  • 1
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    Online Resource
    Влияние распределения волновой функции на диссоциацию экситонов в электрическом поле
    Ioffe Institute Russian Academy of Sciences ; 2018
    In:  Физика твердого тела Vol. 60, No. 8 ( 2018), p. 1495-
    Details
    In: Физика твердого тела, Ioffe Institute Russian Academy of Sciences, Vol. 60, No. 8 ( 2018), p. 1495-
    Abstract: Показано, что порог диссоциации экситона --- связанной электрон-дырочной пары --- в электрическом полем определяется, главным образом, его энергией: как и ожидалось, напряжение диссоциации уменьшается с ростом энергии экситона. Однако в мультиплетах состояний, принадлежащих определенному главному квантовому числу n, напряжение диссоциации возрастает с ростом энергии состояния, что противоречит ожиданиям, основанным на энергетических соображениях. Такое поведение продемонстрировано на желтой экситонной серии в Cu 2 O, оно связано с перераспределением волновой функции в потенциальном рельефе, где верхнее (нижнее) по энергии состояние сдвигается к (от) туннельному барьеру. Мы благодарим Немецкое научное общество за поддержку в рамках программы ICRC TRR 160 (проект A1) и проекта N AS 459/1-3. Мы признательны за частичную поддержку РФФИ (15-52-12012), гранту Президента РФ МД-1555.2017.2 и программе Президиума РАН "Наноструктуры: физика, химия, биология, основы технологии". M.B. также благодарен за поддержку гранту Правительства РФ 14.Z50.31.0021.
    Type of Medium: Online Resource
    ISSN: 0367-3294
    URL: Article
    DOI: 10.21883/FTT.2018.08.46235.10Gr
    Language: Russian
    Publisher: Ioffe Institute Russian Academy of Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2823623-3
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  • 2
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    Online Resource
    Critical dependence of the excitonic absorption in cuprous oxide on experimental parameters
    Ioffe Institute Russian Academy of Sciences ; 2018
    In:  Физика твердого тела Vol. 60, No. 8 ( 2018), p. 1584-
    Details
    In: Физика твердого тела, Ioffe Institute Russian Academy of Sciences, Vol. 60, No. 8 ( 2018), p. 1584-
    Abstract: We study the modification of the exciton absorption in cuprous oxide by the presence of free carriers excited through above band gap excitation. Without this pumping, the absorption spectrum below the band gap consists of the yellow exciton series with principal quantum numbers up to more than n=20, depending on the temperature, changing over to an about constant, only slowly varying absorption above the gap. Careful injection of free carriers, starting from densities well below 1 mum -3 , leads to a reduction of the band gap through correlation effects. The excitons in the Rydberg regime above n=10 remain unaffected until the band gap approaches them. Then they loose oscillator strength and ultimately vanish upon crossing with the band gap. We gratefully acknowledge support by the Priority Programme 1929 "Giant Interactions in Rydberg Systems", the TRR 160 "Coherent manipulation of interacting spin excitations in tailored semiconductors", and the SFB 652/3 "Strong correlations in the radiation field", all funded by the Deutsche Forschungsgemeinschaft. MB also acknowledges support by the RF Government Grant N 14.Z50.31.0021. We would like to thank D. Semkat and H. Stolz for fruitful discussions.
    Type of Medium: Online Resource
    ISSN: 0367-3294
    URL: Article
    DOI: 10.21883/FTT.2018.08.46251.19Gr
    Language: Russian
    Publisher: Ioffe Institute Russian Academy of Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2823623-3
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  • 3
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    Online Resource
    Oscillations of the degree of circular polarization in the optical spin Hall effect
    Ioffe Institute Russian Academy of Sciences ; 2018
    In:  Физика твердого тела Vol. 60, No. 8 ( 2018), p. 1582-
    Details
    In: Физика твердого тела, Ioffe Institute Russian Academy of Sciences, Vol. 60, No. 8 ( 2018), p. 1582-
    Abstract: The optical spin Hall effect appears when elastically scattered exciton polaritons couple to an effective magnetic field inside of quantum wells in semiconductor microcavities. Theory predicts an oscillation of the pseudospin of the exciton polaritons in time. Here, we present a detailed analysis of momentum space dynamics of the exciton polariton pseudospin. Compared to what is predicted by theory, we find a higher modulation of the temporal oscillations of the pseudospin. We attribute the higher modulation to additional components of the effective magnetic field which have been neglected in the foundational theory of the optical spin Hall effect. Adjusting the model by adding non-linear polariton-polariton interactions, we find a good agreement in between the experimental results and simulations. Acknowledgements We gratefully acknowledge financial support by the Deutsche Forschungsgemeinschaft in the framework of the ICRC TRR 160 within Project N B7. The Wurzburg group acknowledges support by the Deutsche Forschungsgemeinschaft within Project N SCHN1376-3.1. E.S. acknowledges support from the Russian Foundation for Basic Research Grant N 16-32-60104. A.K. and E.S. acknowledge support from the Engineering and Physical Sciences Research Council (EPSRC) Programme Grant N EP/M025330/1 "Hybrid Polaritonics". A.K. acknowledges partial support from the HORIZON 2020 RISE project CoExAn (Grant N 644076). A.K. acknowledges support from the Russian Foundation for Basic Research Grant N 15-52-12018.
    Type of Medium: Online Resource
    ISSN: 0367-3294
    URL: Article
    DOI: 10.21883/FTT.2018.08.46249.13Gr
    Language: Russian
    Publisher: Ioffe Institute Russian Academy of Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2823623-3
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  • 4
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    Online Resource
    Influence of magnetic confinement on the yellow excitons in cuprous oxide subject to an electric field
    Ioffe Institute Russian Academy of Sciences ; 2018
    In:  Физика твердого тела Vol. 60, No. 8 ( 2018), p. 1580-
    Details
    In: Физика твердого тела, Ioffe Institute Russian Academy of Sciences, Vol. 60, No. 8 ( 2018), p. 1580-
    Abstract: We study the spectrum of the yellow exciton series in crossed electric and magnetic fields. The electric field, applied along the optical axis, tilts the Coulomb potential between electron and hole, so that at sufficiently high fields exciton dissociation becomes possible, roughly when the electric dipole interaction energy exceeds the binding energy of an exciton state with principal quantum number n. For an applied voltage of U = 20 V all excitons above n=6 are dissociated. Additional application of a magnetic field normal to the optical axis introduces magnetic confinement, due to which above a threshold field strength around B=2.5 T the exciton lines re-emerge. The complex dispersion with increasing fields suggests quantum chaotic behavior in this crossed field configuration, so that the search for exceptional points may be promising. Acknowledgements We gratefully acknowledge the support of this project by the Deutsche Forschungsgemeinschaft in the frame of the ICRC TRR 160 (project A1) and the project AS 459/1-3. MB also acknowledges support by the RF Government Grant N 14.Z50.31.0021.
    Type of Medium: Online Resource
    ISSN: 0367-3294
    URL: Article
    DOI: 10.21883/FTT.2018.08.46247.11Gr
    Language: Russian
    Publisher: Ioffe Institute Russian Academy of Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2823623-3
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  • 5
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    Online Resource
    Landau-level quantization of the yellow excitons in cuprous oxide
    Ioffe Institute Russian Academy of Sciences ; 2018
    In:  Физика твердого тела Vol. 60, No. 8 ( 2018), p. 1585-
    Details
    In: Физика твердого тела, Ioffe Institute Russian Academy of Sciences, Vol. 60, No. 8 ( 2018), p. 1585-
    Abstract: Lately, the yellow series of P-excitons in cuprous oxide could be resolved up to the principal quantum number n=25. Adding a magnetic field, leads to additional confinement normal to the field. Thereby, the transition associated with the exciton n is transformed into the transition between the electron and hole Landau levels with quantum number n, once the associated magnetic length becomes smaller than the related exciton Bohr radius. The magnetic field of this transition scales roughly as n -3 . As a consequence of the extended exciton series, we are able to observe Landau level transitions with unprecedented high quantum numbers of more than 75. Acknowledgements. We gratefully acknowledge the support of this project by the Deutsche Forschungsgemeinschaft in the frame of the ICRC TRR 160 (project A1) and the project AS 459/1-3. MB also acknowledges support by the RF Government Grant No. 14.Z50.31.0021.
    Type of Medium: Online Resource
    ISSN: 0367-3294
    URL: Article
    DOI: 10.21883/FTT.2018.08.46252.20Gr
    Language: Russian
    Publisher: Ioffe Institute Russian Academy of Sciences
    Publication Date: 2018
    detail.hit.zdb_id: 2823623-3
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  • 6
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    Online Resource
    A High-Throughput Photon Processing Technique for Range Extension of SPAD-Based LiDAR Receivers
    Institute of Electrical and Electronics Engineers (IEEE) ; 2022
    In:  IEEE Open Journal of the Solid-State Circuits Society Vol. 2 ( 2022), p. 12-25
    Details
    In: IEEE Open Journal of the Solid-State Circuits Society, Institute of Electrical and Electronics Engineers (IEEE), Vol. 2 ( 2022), p. 12-25
    Type of Medium: Online Resource
    ISSN: 2644-1349
    URL: Article
    DOI: 10.1109/OJSSCS.2021.3118987
    Language: Unknown
    Publisher: Institute of Electrical and Electronics Engineers (IEEE)
    Publication Date: 2022
    detail.hit.zdb_id: 3020004-0
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