Zobrazeno 1 - 10
of 585
pro vyhledávání: '"Fronc, K"'
Autor:
Kłopotowski, Ł., Wojnar, P., Kret, S., Parlińska-Wojtan, M., Fronc, K., Karczewski, G., Wojtowicz, T.
We demonstrate an efficient method to engineer the quantum confinement in a system of two quantum dots grown in a vertical stack. We achieve this by using materials with a different lattice constant for the growth of the outer and inner barriers. We
Externí odkaz:
http://arxiv.org/abs/1502.03592
Autor:
Kłopotowski, Ł., Wojnar, P., Cywiński, Ł., Jakubczyk, T., Goryca, M., Fronc, K., Wojtowicz, T., Karczewski, G.
Publikováno v:
Phys. Rev. B 92, 075303 (2015)
We present photoluminescence studies of CdTe and CdMnTe quantum dots grown in two adjacent layers. We show that when the dots are 8 nm apart, their magnetooptical properties - Zeeman shifts and transition linewidths - are analogous to those of indivi
Externí odkaz:
http://arxiv.org/abs/1502.03589
Autor:
Kazimierczuk, T., Smoleński, T., Kobak, J., Goryca, M., Pacuski, W., Golnik, A., Fronc, K., Kłopotowski, Łukasz, Wojnar, P., Kossacki, P.
We present an experimental study of electron-electron exchange interaction in self-assembled CdTe/ZnTe quantum dots based on the photoluminescence measurements. The character and strength of this interaction are obtained by simultaneous observation o
Externí odkaz:
http://arxiv.org/abs/1304.5914
Autor:
Kłopotowski, Ł., Cywiński, Ł., Szymura, M., Voliotis, V., Grousson, R., Wojnar, P., Fronc, K., Kazimierczuk, T., Golnik, A., Karczewski, G., Wojtowicz, T.
Publikováno v:
Physical Review B 87, 245316 (2013)
We present a comprehensive experimental and theoretical studies of photoluminescence of single CdMnTe quantum dots with Mn content x ranging from 0.01 to 0.2. We distinguish three stages of the equilibration of the exciton-Mn ion spin system and show
Externí odkaz:
http://arxiv.org/abs/1304.3018
Autor:
Wrobel, J., Zagrajek, P., Czapkiewicz, M., Bek, M., Sztenkiel, D., Fronc, K., Hey, R., Ploog, K. H., Bulka, B. R.
We report low-temperature transport measurements of three-terminal T-shaped device patterned from GaAs/AlGaAs heterostructure. We demonstrate the mode branching and bend resistance effects predicted by numerical modeling for linear conductance data.
Externí odkaz:
http://arxiv.org/abs/0912.2004
Autor:
Czapkiewicz, M., Zagrajek, P., Wrobel, J., Grabecki, G., Fronc, K., Dietl, T., Ono, Y., Matsuzaka, S., Ohno, H.
Publikováno v:
Europhys. Lett., 82 (2008) 27003
The unexpected "0.7" plateau of conductance quantisation is usually observed for ballistic one-dimensional devices. In this work we study a quasi-ballistic quantum wire, for which the disorder induced backscattering reduces the conductance quantisati
Externí odkaz:
http://arxiv.org/abs/0712.1672
Autor:
Wróbel, J., Dietl, T., Lusakowski, A., Grabecki, G., Fronc, K., Hey, R., Ploog, K. H., Shtrikman, H.
Publikováno v:
Phys. Rev. Lett. Vol.93, 246601 (2004)
We fabricated a hybrid structure in which cobalt and permalloy micromagnets produce a local in-plane spin-dependent potential barrier for high-mobility electrons at the GaAs/AlGaAs interface. Spin effects are observed in ballistic transport in the te
Externí odkaz:
http://arxiv.org/abs/cond-mat/0404282
Autor:
Grabecki, G., Wrobel, J., Fronc, K., Aleszkiewicz, M., Guziewicz, M., Papis, E., Kaminska, E., Piotrowska, A., Shtrikman, H., Dietl, T.
Publikováno v:
Physica E 21, 451 (2004).
The work presents an experimental demonstration of time-reversal asymmetry of electron states propagating along boundary separating areas with opposite magnetic fields. For this purpose we have fabricated a hybrid ferromagnet-semiconductor device in
Externí odkaz:
http://arxiv.org/abs/cond-mat/0311214
Autor:
Nguyen, T. A., Mackowski, S., Rho, H., Jackson, H. E., Smith, L. M., Wrobel, J., Fronc, K., Kossut, J., Karczewski, G., Dobrowolska, M., Furdyna, J.
We show that two major carrier excitation mechanisms are present in II-VI self-assembled quantum dots. The first one is related to direct excited state - ground state transition. It manifests itself by the presence of sharp and intense lines in the e
Externí odkaz:
http://arxiv.org/abs/cond-mat/0310571
Autor:
Nguyen, T. A., Mackowski, S., Jackson, H. E., Smith, L. M., Wrobel, J., Fronc, K., Karczewski, G., Kossut, J., Furdyna, M. Dobrowolska J. K., Heiss, W.
Using resonantly excited photoluminescence along with photoluminescence excitation spectroscopies, we study the carrier excitation processes in CdTe/ZnTe and CdSe/ZnSe self-assembled quantum dots. Photoluminescence excitation spectra of single CdTe q
Externí odkaz:
http://arxiv.org/abs/cond-mat/0309410