Temat: 71.36.+c - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: From Localised to Ballistic Excitons in GaAs Quantum Wells
Autorzy:: Pulizzi, F.
Christianen, P. C. M.
Maan, J. C.
Eshlaghi, S.
Reuter, D.
Wieck, A. D.
Tematy:: 71.35.-y
71.36.+c; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2028827.pdf Link otwiera się w nowym oknie
Opis:: The lateral motion of excitons in GaAs quantum wells is studied by means of spatially resolved photoluminescence. We show that at low temperatures (4.2 K) the exciton motion evolves from localised excitons (zero mobility) in thin quantum wells to extremely high mobilities in wide wells. We find that for the widest quantum well investigated the observed motion cannot be explained by simple exciton diffusion and must be explained by the propagation of ballistic exciton polaritons.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Polariton Effects in Molecular Crystals Studied by Classical and Quantum-Electrodynamic Approaches
Autorzy:: Stradomska, A.
Petelenz, P.
Tematy:: 71.35.-y
71.36.+c
78.20.Ci; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1814012.pdf Link otwiera się w nowym oknie
Opis:: A quantum-electrodynamic approach is studied as an alternative to the classical description of polaritons in molecular crystals, with the focus on future interpretation of oligothiophene spectra. As expected, the results of the two approaches coincide, but the quantum description is better suited for future generalizations, notably for detailed studies of vibronic coupling. The quantum approach is used here to probe the importance of inherent polaritonic effects. They are found to be minor, being superseded by vibronic interactions; the latter are responsible for most peculiarities observed in oligothiophene spectra.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Intersubband Antipolaritons in Quantum Cascade Laser Structures
Autorzy:: Pereira, M.
Tematy:: 71.36.+c
71.10.-w; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1813186.pdf Link otwiera się w nowym oknie
Opis:: This paper presents an application of a dielectric approach to the strong coupling between light and intersubband transitions in a quantum cascade laser structure. The multisubband transition possibility allows for an interesting scenario of coexisting absorption and gain branches in the antipolariton dispersions.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Optical Trapping and Propagation of Nonresonantly Driven One-Dimensional Exciton-Polariton Condensate
Autorzy:: Opala, A.
Pieczarka, M.
Sęk, G.
Tematy:: 67.85.De
71.36.+c
03.75.Kk; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1033879.pdf Link otwiera się w nowym oknie
Opis:: We study theoretically a nonresonant optical creation of a one-dimensional exciton-polariton condensate in a semiconductor microcavity. The polariton condensate is treated in the mean-field approach, taking into consideration an antitrapping potential created by the reservoir of noncondensed particles. Polariton condensates are excited by multiple lasers, with a combination of continuous wave and pulsed sources. The proposed pump-probe configuration leads to the realisation of various experimental schemes, e.g. optical trapping of a polariton condensate in real space. Moreover, it can be utilised for investigation of elementary excitations in the time domain when polariton condensates from two sources interact with each other.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Dielectric Function Theory Calculations of Polaritons in GaN
Autorzy:: Korona, K. P.
Stępniewski, R. Stępniewski
Baranowski, J. M.
Tematy:: 78.66.Fd
71.36.+c; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1968249.pdf Link otwiera się w nowym oknie
Opis:: Properties of polaritons (free excitons coupled with photons of similar energy) in gallium nitride are investigated by performing calculations based on dielectric function theory including all three excitons A, B and C (characteristic for the wurtzite structure). Moreover the excited states of excitons have been taken into account by adding Elliott's components to dielectric function. Energies, polarizabilities and damping constants of excitons are determined. It is shown that due to inter-exciton interactions the B and C excitons are strongly damped. It is estimated that the characteristic time of B to A relaxation is t$\text{}_{BA}$=1 ps. The exciton C lifetime is estimated τ$\text{}_{C}$=0.2 ps.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 6.

Tytuł:: Stimulated Scattering of Microcavity Polaritons
Autorzy:: Bloch, J.
Senellart, P.
Thierry-Mieg, V.
Marzin, J. Y.
Tematy:: 42.55.Sa
71.35.Lk
71.36.+c
78.30.Fs; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2014174.pdf Link otwiera się w nowym oknie
Opis:: We report on cw optical experiments performed in a semiconductor microcavity containing a single quantum well in the strong coupling regime. Angularly resolved photoluminescence measurements under non-resonant excitation show the collapse of a relaxation bottleneck as the excitation power is increased. As a result, the emission close to k$\text{}_{∥}$=0 presents a non-linear behavior. In a two-beam experiment we resonantly inject polaritons at k$\text{}_{∥}$=0 and show that relaxation from states with large in-plane wave vector toward k$\text{}_{∥}$=0 is stimulated by the polariton final state population.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 7.

Tytuł:: Time-Resolved Emission from Semiconductor Microcavities
Autorzy:: Kłopotowski, Ł.
Viña, L.
Kavokin, A.
Dang, L. S.
André, R.
Tematy:: 71.36.+c
71.55.Gs
78.47.+p; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2038372.pdf Link otwiera się w nowym oknie
Opis:: We present a time-resolved study of the light emission of a CdTe-based microcavity. In the nonlinear regime, under high excitation conditions, in the strong coupling regime, we observe pronounced beats of the intensity of the photoluminescence arising from the bottleneck region of the exciton-polariton band. These beats are very sensitive to the excitation density and vanish under weak pumping conditions. We attribute the beats to a new nonlinear coupling mechanism of optically active and dark crystal states, related to polariton-polariton scattering, which leads to mixing between bright and dark states.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 8.

Tytuł:: Dynamics of Polariton Emission in the Linear Regime
Autorzy:: Kłopotowski, Ł.
Santos, R.
Amo, A.
Martín, M. D.
Viña, L.
André, R.
Tematy:: 71.36.+c
71.55.Gs
78.47.+p; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2038373.pdf Link otwiera się w nowym oknie
Opis:: We studied the dependence of polariton emission dynamics on polariton wave-vector and exciton-photon energy detuning. To reproduce the experimental data, we applied a model that obtains the photonic and the excitonic emission rates of the polariton.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 9.

Tytuł:: Dynamical and tuneable modulation of the Tamm plasmon/exciton-polariton hybrid states using surface acoustic waves
Autorzy:: Buller, J.
Cerda-Méndez, E.
Balderas-Navarro, R.
Santos, P.
Tematy:: 71.36.+c
42.55.Sa
85.50.-n; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1156776.pdf Link otwiera się w nowym oknie
Opis:: In this work, we discuss theoretically the formation of the Tamm plasmon/exciton-polariton hybrid states in an (Al,Ga)As microcavity and their modulation by surface acoustic waves. The modulation of the Tamm plasmon/exciton-polariton states origins in the change of the excitonic band gap energy and the thickness change of the sample structure layers due to the induced strain fields by surface acoustic waves. The frequency f_{SAW} of the acoustic modulation of the Tamm plasmon/exciton-polariton states is limited by the thickness of the upper distributed Bragg reflector. For the Tamm plasmon/exciton-polariton states in Al_xGa_{1-x}As/GaAs structures f_{SAW} is in the range of 370 MHz while f_{SAW} in GHz range is possible for the parametric Tamm plasmon/exciton-polariton states. In both cases, the acoustic modulation is several meV for typical acoustic power levels.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 10.

Tytuł:: SU(2) Coherent State Path Integral Investigation of the Holstein Dimer
Autorzy:: Hakioğlu, T.
Ivanov, V. A.
Zhuravlev, M. Ye.
Tematy:: 03.65.Db
71.36.+c
64.60.Ak; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/2013732.pdf Link otwiera się w nowym oknie
Opis:: The SU(2) coherent state path integral is used to investigate the partition function of the Holstein dimer. This approach naturally takes into account the dynamical symmetry of the model. The ground-state energy and the number of the phonons are calculated as functions of the parameters of the Hamiltonian. The renormalizations of the phonon frequency and electron hopping for bonding and antibonding states are considered. The destruction of quasiclassical mean field solution is discussed.
Dostawca treści:: Biblioteka Nauki

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