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    Wyświetlanie 1-7 z 7
    Tytuł:
    Time Resolved Magnetophotoluminescence of Biased GaAs/AlGaAs Double Quantum Well Structure
    Autorzy:
    Surowiecka, K.
    Wysmołek, A.
    Stępniewski, R.
    Potemski, M.
    Henini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1811991.pdf
    Data publikacji:
    2008-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    71.35.Ji
    78.67.De
    Opis:
    Time resolved photoluminescence of double quantum well structure was investigated versus electric and magnetic fields applied across the sample. The emission due to direct excitons (electron and hole are localized within the same quantum well) decays fast at the nanosecond timescale, whereas the recombination kinetics of indirect excitons is much slower and spreads over microseconds. The time evolution of indirect exciton emission is shown to be altered by application of either electric or magnetic field. This reflects the non-trivial effects of exciton localization which leads to the non-exponential decays of the indirect exciton emission.
    Źródło:
    Acta Physica Polonica A; 2008, 114, 5; 1369-1374
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Stochastic Carrier Dynamics in Semiconductor Superlattices
    Autorzy:
    Fromhold, T. M.
    Bujkiewicz, S.
    Patanè, A.
    Stapleton, S. P.
    Sherwood, D.
    Fowler, D.
    Cooper, J.
    Eaves, L.
    Belyaev, A. E.
    Krokhin, A. A.
    Neumann, A.
    Wilkinson, P. B.
    Sankeshwar, N. S.
    Henini, M.
    Sheard, F. W.
    Powiązania:
    https://bibliotekanauki.pl/articles/2044604.pdf
    Data publikacji:
    2006-01
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.20.At
    73.21.Cd
    Opis:
    We explore a new regime of hot carrier dynamics, in which electrons in a superlattice miniband exhibit a unique type of stochastic motion when a magnetic field is tilted at an angle θ to the superlattice axis. Remarkably, the dynamics of a miniband electron in a tilted magnetic field reduce to a one-dimensional simple harmonic oscillator, of angular frequency ω$\text{}_{C}$ cos θ, where ω$\text{}_{C}$ is the cyclotron frequency, driven by a time-dependent plane wave whose angular frequency equals the Bloch frequency ω$\text{}_{B}$. At bias voltages for which ω$\text{}_{B}$=nω$\text{}_{C}$ cos θ, where n is an integer, the electron orbits change from localised Bloch-like trajectories to unbounded stochastic orbits, which diffuse rapidly through intricate web patterns in phase space. To quantify how these webs affect electron transport, we make drift-diffusion calculations of the current-voltage curves including the effects of space-charge build up. When the magnetic field is tilted, our simulations reveal a large resonant peak, which originates from stochastic delocalisation of the electron orbits. We show that the corresponding quantised eigenstates change discontinuously from a highly localised character when the system is off resonance to a fully delocalised form when the resonance condition is satisfied.
    Źródło:
    Acta Physica Polonica A; 2006, 109, 1; 43-52
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum States of Self-Assembled InAs Dots Probed by Magneto-Tunneling Spectroscopy
    Autorzy:
    Patanè, A.
    Eaves, L.
    Main, P. C.
    Levin, A.
    Zambrano, M. L.
    Henini, M.
    Vdovin, E. E.
    Dubrovskii, Y. V.
    Hill, G.
    Powiązania:
    https://bibliotekanauki.pl/articles/2027456.pdf
    Data publikacji:
    2001-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.63.-b
    73.63.Kv
    73.43.Jn
    Opis:
    We present an experimental study of the electron wave function in InAs/GaAs self-assembled quantum dots. Magneto-tunneling spectroscopy is employed as a non-invasive probe to produce two-dimensional images of the probability density of an electron confined in a quantum dot. The images reveal the elliptical symmetry of the ground state and the characteristic lobes of the higher energy states of the dots.
    Źródło:
    Acta Physica Polonica A; 2001, 100, 2; 165-173
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    High-Pressure Magnetotransport Measurements of Resonant Tunnelling via X-Minimum Related States in AlAs Barrier
    Autorzy:
    Gryglas, M.
    Przybytek, J.
    Baj, M.
    Eaves, L.
    Henini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2028835.pdf
    Data publikacji:
    2001-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.43.Jn
    73.63.Hs
    Opis:
    In this paper, we present the results of magnetotransport experiments performed on a single barrier GaAs/AlAs/GaAs heterostructures. Tunnel current was measured as a function of magnetic field for different values of bias voltage and hydrostatic pressure. We observed that the amplitude of the magnetooscillations of tunnel current quenched when the requirements for resonant tunnelling were met and it recovered in out-of-resonance conditions. This effect was observed both for tunnelling through donor states and through X-minimum related quasiconfined conduction band states. The fact that also in the latter case the amplitude was restored suggests that this process involved X$\text{}_{z}$ subbands and took place without a participation of phonons (the so-called k$\text{}_{ǁ}$-conserving process).
    Źródło:
    Acta Physica Polonica A; 2001, 100, 3; 403-408
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Fine Structure of the Localized Emission from GaInNAs Layers Studied by Micro-Photoluminescence
    Autorzy:
    Kudrawiec, R.
    Latkowska, M.
    Sęk, G.
    Misiewicz, J.
    Ibáñez, J.
    Henini, M.
    Hopkinson, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1791353.pdf
    Data publikacji:
    2009-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    78.55.Cr
    78.66.Fd
    Opis:
    GaInNAs bulk-like layers ( ≈ 20% In and ≈ 3% N) grown on GaAs substrate with various crystallographic orientations have been studied by micro-photoluminescence at low temperatures for a broad range of excitation conditions. In addition to photoluminescence peaks, which are associated with heavy- and light-hole free exciton recombination, a band of sharp lines was observed below the fundamental free exciton transition at low excitation. It shows that the localized emission which is typical of this alloy at low temperatures is composed of individual narrow photoluminescence lines which are associated with the recombination of single excitons. They can be localized on various local potential minima including those originating from the alloy content fluctuations and/or deep acceptor(donor)-like complexes.
    Źródło:
    Acta Physica Polonica A; 2009, 116, 5; 930-932
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Capacitance Spectroscopy of Single-Barrier GaAs/AlAs/GaAS Structures Containing InAs Quantum Dots
    Autorzy:
    Belyaev, A. E.
    Eaves, L.
    Main, P. C.
    Polimeni, A.
    Stoddart, S. T.
    Henini, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1969042.pdf
    Data publikacji:
    1998-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.40.Gk
    85.30.Mn
    Opis:
    An electrostatic profile of single-barrier heterostructures with InAs quantum dots encased into barrier has been studied. The role of growth conditions and structure's design is investigated. The charging state and position of energy levels for InAs quantum dots embedded in AlAs matrix are discussed.
    Źródło:
    Acta Physica Polonica A; 1998, 94, 2; 245-249
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    2D Electron Gas in Non-Uniform Magnetic Fields
    Autorzy:
    Gallagher, B. L.
    Kubrak, V.
    Rushforth, A.
    Neumann, A. C.
    Edmonds, K. W.
    Main, P. C.
    Henini, M.
    Marrows, C. H.
    Hickey, B. J.
    Thoms, S.
    Dahlberg, D. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/2014148.pdf
    Data publikacji:
    2000-09
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    73.50.Jt
    73.20.Dx
    73.23.Ad
    73.50.Fq
    Opis:
    We present a review of some of our recent experimental work on hybrid ferromagnet/semiconductor devices in which 2D electrons propagate through magnetic barriers, periodic magnetic modulations, and random magnetic fields.
    Źródło:
    Acta Physica Polonica A; 2000, 98, 3; 217-230
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-7 z 7

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