Autor: Kamp, M. - Prolib Integro

Skocz do pozycji: 1.

Tytuł:: Controlling the biexciton-exciton cascade kinetics in a quantum dot via coupling to a microcavity optical mode
Autorzy:: Sęk, G.
Krizhanovskii, D.
Kulakovskii, V.
Reitzenstein, S.
Kamp, M.
Tematy:: 78.67.Hc
71.35.-y
78.55.-m
42.50.Pq; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1160147.pdf Link otwiera się w nowym oknie
Opis:: The luminescence of single and two exciton states in a quantum dot embedded in the active layer of a micropillar cavity has been investigated. Temperature tuning has been used to bring the energy states of the quantum dot and the cavity into resonance. Studying the resonance behavior of the exciton and biexciton transitions with cavity mode revealed a similar Purcell effect for both lines. The cavity-induced changes of the respective radiative lifetimes have been shown to allow for controlling the ratio between the single and two exciton occupation and their relative emission rates in a single quantum dot.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Room Temperature Carrier Kinetics in the W-type GaInAsSb/InAs/AlSb Quantum Well Structure Emitting in Mid-Infrared Spectral Range
Autorzy:: Syperek, M.
Ryczko, K.
Dallner, M.
Dyksik, M.
Motyka, M.
Kamp, M.
Höfling, S.
Misiewicz, J.
Sęk, G.
Tematy:: 73.21.Fg
78.47.D-
78.30.Fs
78.47.jg
78.55.Cr
78.67.De; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1398579.pdf Link otwiera się w nowym oknie
Opis:: Room temperature carrier kinetics has been investigated in the type-II W-design $AlSb//InAs//Ga_{0.80}In_{0.20}As_{0.15}Sb_{0.85}//InAs//AlSb$ quantum well emitting in the mid-infrared spectral range (at 2.54 μ m). A time-resolved reflectance technique, employing the non-degenerated pump-probe scheme, has been used as a main experimental tool. Based on that, a primary carrier relaxation time of 2.3±0.2 ps has been found, and attributed to the initial carrier cooling process within the quantum well states, while going towards the ground state via the carrier-optical phonon scattering mechanism. The decay of a quasi-equilibrium carrier population at the quantum well ground states is primarily governed by two relaxation channels: (i) radiative recombination within distribution of spatially separated electrons and holes that occurs in the nanosecond time scale, and (ii) the hole tunnelling out of its confining potential, characterized by a 240±10 ps time constant.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: GaAs-Based Quantum Well Exciton-Polaritons beyond 1 μm
Autorzy:: Pieczarka, M.
Podemski, P.
Musiał, A.
Ryczko, K.
Sęk, G.
Misiewicz, J.
Langer, F.
Höfling, S.
Kamp, M.
Forchel, A.
Tematy:: 73.21.-b
78.67.-n
78.67.Pt; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1399094.pdf Link otwiera się w nowym oknie
Opis:: Realization of the Bose-Einstein condensate can provide a way for creation of an inversion-free coherent light emitter with ultra-low threshold power. The currently considered solutions provide polaritonic emitters in a spectral range far below 1 μm limiting their application potential. Hereby, we present optical studies of InGaAs/GaAs based quantum well in a cavity structure exhibiting polaritonic eigenmodes from 5 to 160 K at a record wavelength exceeding 1 μm. The obtained Rabi splitting of 7 meV was almost constant with temperature, and the resulting coupling constant is close to the calculated QW exciton binding energy. This indicates the very strong coupling conditions explaining the observation of polaritons at temperatures where the exciton dissociation is already expected, and allows predicting that room temperature polaritons could still be formed in this kind of a system.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 4.

Tytuł:: Effect of dielectric medium anisotropy on the polarization degree of emission from a single quantum dash
Autorzy:: Mrowiński, P.
Tarnowski, K.
Olszewski, J.
Somers, A.
Kamp, M.
Höfling, S.
Reithmaier, J.
Urbańczyk, W.
Misiewicz, J.
Machnikowski, P.
Sęk, G.
Tematy:: 78.67.Hc
71.35.-y
78.55.-m; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1159588.pdf Link otwiera się w nowym oknie
Opis:: Excitonic emission from single InAs/InGaAlAs/InP quantum dashes has been investigated in the context of degree of linear polarization by post-growth modification of its surrounding dielectric medium. We present optical spectroscopy measurements on a symmetric squared pedestal structures (mesas), and asymmetric rectangular ones oriented parallel or perpendicular to the main in-plane axis of the dashes [1-10]. Polarization resolved microphotoluminescence shows a significant quantitative modification of the degree of linear polarization value from -20% up to 70%. These results have been confronted with calculations of the coupling between the exciton transition dipole moment and electromagnetic field distributed in the vicinity of a quantum dash inside a processed mesa.
Dostawca treści:: Biblioteka Nauki

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na półce

Skocz do pozycji: 5.

Tytuł:: Semiconductor Cavity Quantum Electrodynamics with Single Quantum Dots
Autorzy:: Reitzenstein, S.
Schneider, C.
Münch, S.
Kistner, C.
Strauss, M.
Huggenberger, A.
Franeck, P.
Weinmann, P.
Kamp, M.
Höfling, S.
Worschech, L.
Forchel, A.
Tematy:: 73.21.La
71.35.Ji
71.55.Eq
37.30.+i; Pokaż więcej
Wydawca:: Polska Akademia Nauk. Instytut Fizyki PAN
Powiązania:: https://bibliotekanauki.pl/articles/1791177.pdf Link otwiera się w nowym oknie
Opis:: This paper summarizes recent progress achieved in the field of semiconductor cavity quantum electrodynamics with single quantum dots with the focus being on micropillar cavities. Light-matter interaction both in the strong and weak coupling regime is presented. Resonance tuning of the quantum dot by temperature, electric fields and magnetic fields is demonstrated while the strong coupling regime can be reached. Additionally, deterministic device integration of single positioned quantum dots is reported by a combination of site controlled quantum dot growth via directed nucleation and subsequent device alignment to overcome the degree of randomness of the quantum dot position in so far most common quantum dot-cavity systems.
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: Oscillator strength of optical transitions in InGaAsN/GaAsN/GaAs quantum wells
Autorzy:: Mika, A
Sek, G
Ryczko, K
Kozub, M
Musial, A
Marynski, A
Misiewicz, J
Langer, F
Höfling, S
Appel, T
Kamp, M
Forchel, A
Tematy:: dilute nitride
quantum well
oscillator strength; Pokaż więcej
Wydawca:: Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Powiązania:: https://bibliotekanauki.pl/articles/173586.pdf Link otwiera się w nowym oknie
Opis:: Experimental and theoretical considerations and results on the effect of nitrogen incorporation on the oscillator strength of optical transitions in InGaNAs/GaAs quantum wells (QWs) are presented. Therefore, a set of dilute nitride quantum well structures was grown by molecular beam epitaxy. Optical investigation via spectroscopic methods have been performed at various temperatures for both the as-grown samples, and after rapid thermal annealing. The fundamental transition energy and its oscillator strength vs. the QW composition have been systematically investigated. Additionally, the effect of the bandgap discontinuities on the transitions intensity has also been considered. The experimental data have been confronted with the band structure calculations within the effective mass approximation employing a two level repulsion model for the nitrogen-containing structures. The obtained results are crucial for possible future applications employing the quantum well in cavity structures and bringing the practical exploitation of quantum electrodynamics phenomena to the telecommunication spectral range.
Dostawca treści:: Biblioteka Nauki

Artykuł

na półce

Skocz do pozycji: 7.

Tytuł:: A multilab investigation into the N2pc as an indicator of attentional selectivity: Direct replication of Eimer (1996)
Autorzy:: Yılmaz, Ece
Jost, Kerstin
Kliegel, Matthias
Corballis, Paul M.
Ayatollahi, Shabnamalsadat
Baess, Pamela
Pastötter, Bernhard
Panek, Bartłomiej
Pesciarelli, Francesca
Borelli, Eleonora
Beck, Melissa
Costa, Thiago L.
Knopf, Luisa
Nowacka, Alicja
León Montoya, Gustavo A.
Itier, Roxane J.
Molinero, Sara
Li, Danqi
Steendam, Tabitha
Luque, David
Yamaguchi, Motonori
Vázquez-Millán, Antonio
Somon, Bertille
Chelazzi, Leonardo
Laera, Gianvito
Cao, Liyu
Soyman, Efe
Welke, Dominik
London, Raquel E.
Constant, Martin
Kotlewska, Ilona
Widmann, Andreas
Desantis, Andrea
Meixner, Johannes
Kamp, Siri-Maria
Botes, André
Scanzi, Daniele
Gokce, Ahu
Eayrs, Joshua O.
Mandal, Ananya
Gillmeister, Helge
Manini, Greta
Asanowicz, Dariusz
Capizzi, Mariagrazia
Castellanos, M. Concepción
Monachesi, Bianca
Mushtaq, Faisal
Ramzaoui, Hanane
Quenault, Marlo
Low, Xueqi
Özer, Demet
Torrance, Tamar
Frings, Christian
Wetzel, Nicole
Braddock, Carley
Liesefeld, Heinrich R.
Kerzel, Dirk
Szaszkó, Bence
Pavlov, Yuri G.
Martín-Arévalo, Elisa
Opis:: The N2pc is widely employed as an electrophysiological marker of an attention allocation. This interpretation was largely driven by the observation of an N2pc elicited by an isolated relevant target object, which was reported as Experiment 2 in Eimer (1996). All subsequent refined interpretations of the N2pc had to take this crucial finding into account. Despite its central role for neurocognitive attention research, there have been no direct replications and only few conceptual replications of this seminal work. Within the context of #EEGManyLabs, an international community-driven effort to replicate the most influential EEG studies ever published, the present study was selected due to its strong impact on the study of selective attention. We revisit the idea of the N2pc being an indicator of attentional selectivity by delivering a high powered direct replication of Eimer's work through analysis of 779 datasets acquired from 22 labs across 14 countries. Our results robustly replicate the N2pc to form stimuli, but a direct replication of the N2pc to color stimuli technically failed. We believe that this pattern not only sheds further light on the functional significance of the N2pc as an electrophysiological marker of attentional selectivity, but also highlights a methodological problem with selecting analysis windows a priori. By contrast, the consistency of observed ERP patterns across labs and analysis pipelines is stunning, and this consistency is preserved even in datasets that were rejected for (ocular) artifacts, attesting to the robustness of the ERP technique and the feasibility of large-scale multilab EEG (replication) studies.
Dostawca treści:: Repozytorium Uniwersytetu Jagiellońskiego

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