Wszystkie pola: Kuhn - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Thomas-Reiche-Kuhn Sum Rule for Electron Transitions in Solids
Autorzy:: Olszewski, S.
Powiązania:: https://bibliotekanauki.pl/articles/1968973.pdf
Data publikacji:: 1998-07
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.20.Bh
Opis:: A well-known sum rule obtained for electron transitions between the atomic states by Thomas, Reiche and Kuhn (TRK) is examined for the case of transitions between delocalized electron states in cubic lattices. A characteristic point of the original TRK sum rule for the atomic states was its lack of dependence on the initial state of transitions. This situation holds also for the free-electron states in a metal but is changed in the case of electrons influenced by the presence of the field of the crystal core. Corrections to the original TRK result can be represented as a function of the quantum parameter labelling the initial electron state. Other moments of the spectral distribution function than those leading to the TRK sum rule have been calculated. A comparison of the relations found between different spectral moments for solids with similar relations obtained by Traini for the spectral moments of the atomic states has been done.
Źródło:: Acta Physica Polonica A; 1998, 94, 1; 49-70
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Carrier Trapping in a Quantum Dash: Optical Signatures
Autorzy:: Kaczmarkiewicz, P.
Machnikowski, P.
Kuhn, T.
Powiązania:: https://bibliotekanauki.pl/articles/1403618.pdf
Data publikacji:: 2012-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.67.Hc
73.21.La
Opis:: We theoretically study the optical properties and the electronic structure of highly elongated quantum dots (quantum dashes) and show how geometrical fluctuations affect the excitonic spectrum of the system. The dependence of the absorption intensities on the geometrical properties (depth and length) of the trapping center in a quantum dash is analyzed and the dependence of the degree of the linear polarization on these geometrical parameters is studied.
Źródło:: Acta Physica Polonica A; 2012, 122, 6; 997-1000
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Spatio-Temporal Dynamics of Carrier Capture Processes: Simulation of Optical Signals
Autorzy:: Lengers, F.
Rosati, R.
Kuhn, T.
Reiter, D.
Powiązania:: https://bibliotekanauki.pl/articles/1033096.pdf
Data publikacji:: 2017-08
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: quantum dot
carrier capture
optical signals
Opis:: We perform simulations of time-resolved optical experiments of carrier-capture processes in a quantum wire-dot system. Scattering of charge carriers with optical phonons of the quantum wire can result in transitions from the continuum states of the quantum wire to discrete states of the quantum dot. We treat the scattering of carriers with optical phonons within a Lindblad single-particle approach. By considering the coupling of carriers to a light field we are able to simulate pump-probe experiments which are shown to be capable of measuring the captured populations. We further discuss the influence of the Coulomb interaction on the obtained spectra.
Źródło:: Acta Physica Polonica A; 2017, 132, 2; 372-375
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Characterization of Interfaces in Semimagnetic Quantum Wells
Autorzy:: Schmitt, G.
Kuhn-Heinrich, B.
Zehnder, U.
Ossau, W.
Litz, T.
Waag, A.
Landwehr, G.
Powiązania:: https://bibliotekanauki.pl/articles/1933969.pdf
Data publikacji:: 1995-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.66.-w
78.55.Et
Opis:: The interfaces between nonmagnetic CdTe quantum wells and semimagnetic barriers of Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te were investigated for several well widths by low temperature photoluminescence and photoluminescence excitation spectroscopy. Specially designed Cd$\text{}_{1-x}$Mn$\text{}_{x}$Te/CdTe/Cd$\text{}_{1-y}$Mg$\text{}_{y}$Te structures enable us to distinguish the quality of the semimagnetic normal and inverted interfaces. The normal interface shows to have a better structural quality than the inverted interface.
Źródło:: Acta Physica Polonica A; 1995, 88, 5; 897-900
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: One and Two Phonon Assisted Transitions between Exciton Spin States in a Quantum Dot
Autorzy:: Roszak, K.
Machnikowski, P.
Axt, V.
Kuhn, T.
Powiązania:: https://bibliotekanauki.pl/articles/1811982.pdf
Data publikacji:: 2008-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 72.25.Rb
73.21.La
78.67.Hc
Opis:: Exciton spin decay is studied in a self-assembled InAs/GaAs quantum dot. The spin relaxation results from an interplay of two factors: the Bir-Pikus Hamiltonian and the short-range exchange interaction, leading to one and two phonon assisted transitions. We establish a hierarchy between the resulting transition rates and show the dominating role of transverse phonons for all the transitions.
Źródło:: Acta Physica Polonica A; 2008, 114, 5; 1329-1335
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Dimensional Dependence of Exchange Interactions at High Magnetic Fields
Autorzy:: Zehnder, U.
Kuhn-Heinrich, B.
Ossau, W.
Waag, A.
Landwehr, G.
Cheng, H. H.
Nicholas, R. J.
Powiązania:: https://bibliotekanauki.pl/articles/1952434.pdf
Data publikacji:: 1996-11
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.55.Et
71.35.Ji
Opis:: We studied the contribution of the breaking of antiferromagnetically coupled spin clusters to the total magnetization in thin (CdMn)Te layers as a function of the layer thickness by reflectivity spectroscopy in magnetic fields up to 45 T. The experimental results show that the contribution of the breaking of antiferromagnetically coupled spin clusters is reduced by decreasing layer thickness.
Źródło:: Acta Physica Polonica A; 1996, 90, 5; 989-992
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 7.

Tytuł:: Phonon Effects on Population Inversion in Quantum Dots: Resonant, Detuned and Frequency-Swept Excitations
Autorzy:: Reiter, D.
Lüker, S.
Gawarecki, K.
Grodecka-Grad, A.
Machnikowski, P.
Axt, V.
Kuhn, T.
Powiązania:: https://bibliotekanauki.pl/articles/1409357.pdf
Data publikacji:: 2012-12
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:: 78.67.Hc
78.47.D-
42.50.Md
Opis:: The effect of acoustic phonons on different light-induced excitations of a semiconductor quantum dot is investigated. Resonant excitation of the quantum dot leads to the Rabi oscillations, which are damped due to the phonon interaction. When the excitation frequency is detuned, an occupation can only occur due to phonon absorption or emission processes. For frequency-swept excitations a population inversion is achieved through adiabatic rapid passage, but the inversion is also damped by phonons. For all three scenarios the influence of the phonons depends non-monotonically on the pulse area.
Źródło:: Acta Physica Polonica A; 2012, 122, 6; 1065-1068
0587-4246
1898-794X
Pojawia się w:: Acta Physica Polonica A
Dostawca treści:: Biblioteka Nauki

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