Publications (12)
Engineering the hole confinement for CdTe-based quantum dot molecules
Å. KÅopotowski, P. Wojnar, S. Kret +4
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 differen…
Laser-induced ultrafast structural transformations in thin Fe layer revealed by time-resolved X-ray diffraction
O. Liubchenko, J. Antonowicz, K. Sokolowski-Tinten +27
The ultrafast structural response of a thin iron film to sub-ps pulsed laser-induced heating has been investigated using time-resolved X-ray diffraction in the partial melting regi…
Resonant photoluminescence and excitation spectroscopy of CdSe/ZnSe and CdTe/ZnTe self-assembled quantum dots
T. A. Nguyen, S. Mackowski, H. Rho +8
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. I…
Quantum effects in linear and non-linear transport of T-shaped ballistic junction
J. Wrobel, P. Zagrajek, M. Czapkiewicz +6
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…
Optical signatures of spin dependent coupling in semimagnetic quantum dot molecules
Å. KÅopotowski, P. Wojnar, Å. CywiÅski +5
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 - Zeem…
Optical study of electron-electron exchange interaction in CdTe/ZnTe quantum dots
T. Kazimierczuk, T. SmoleÅski, J. Kobak +7
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 s…
Unidirectional Transmission of Electrons in a Magnetic Field Gradient
G. Grabecki, J. Wrobel, K. Fronc +7
The work presents an experimental demonstration of time-reversal asymmetry of electron states propagating along boundary separating areas with opposite magnetic fields. For this pu…
Exciton spin relaxation in resonantly excited CdTe/ZnTe self-assembled quantum dots
S. Mackowski, T. A. Nguyen, T. Gurung +7
We study the exciton spin relaxation in CdTe self-assembled quantum dots by using polarized photoluminescence spectroscopy in magnetic field. The experiments on single CdTe quantum…
Influence of exciton spin relaxation on the photoluminescence spectra of semimagnetic quantum dots
Å. KÅopotowski, Å. CywiÅski, M. Szymura +8
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…
Spin filtering in a hybrid ferromagnetic-semiconductor microstructure
J. Wróbel, T. Dietl, A. Lusakowski +5
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…
0.7-anomaly and magnetotransport of disordered quantum wires
M. Czapkiewicz, P. Zagrajek, J. Wrobel +6
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…
Resonant Spectroscopy of II-VI Self-Assembled Quantum Dots: Excited States and Exciton-LO Phonon Coupling
T. A. Nguyen, S. Mackowski, H. E. Jackson +7
Using resonantly excited photoluminescence along with photoluminescence excitation spectroscopies, we study the carrier excitation processes in CdTe/ZnTe and CdSe/ZnSe self-assembl…