Zobrazeno 1 - 10
of 992
pro vyhledávání: '"Smith, L. M."'
Autor:
Titova, L. V., Hoang, Thang B., Jackson, H. E., Smith, L. M., Yarrison-Rice, J. M., Lensch, J. L., Lauhon, L. J.
We use spatially resolved micro-PL imaging at low temperature to study optical properties of two sets of CdS nanowires grown using 20 nm and 50 nm catalysts. We find that low temperature PL of single nanowires is an ideal technique to gauge the quali
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608057
Autor:
Hoang, Thang B., Titova, L. V., Jackson, H. E., Smith, L. M., Yarrison-Rice, J. M., Kim, Y., Joyce, H. J., Jagadish, C.
We study the optical properties of a single core-shell GaAs-AlGaAs nanowire (grown by VLS method) using the technique of micro-photoluminescence and spatially-resolved photoluminescence imaging. We observe large linear polarization anisotropy in emis
Externí odkaz:
http://arxiv.org/abs/cond-mat/0608056
Autor:
Hoang, Thang Ba, Titova, L. V., Jackson, H. E., Smith, L. M., Yarrison-Rice, J. M., Lensch, J. L., Lauhon, L. J.
Temperature dependent photoluminescence (PL) is used to study the electronic properties of single CdS nanowires. At low temperatures, both near-band edge (NBE) photoluminescence (PL) and spatially-localized defect-related PL are observed in many nano
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606428
Autor:
Titova, L. V., Hoang, Thang Ba, Jackson, H. E., Smith, L. M., Yarrison-Rice, J. M., Lensch, J. L., Lauhon, L. J.
Time-resolved photoluminescence (PL) and micro-PL imaging were used to study single CdS nanowires at 10 K. The low-temperature PL of all CdS nanowires exhibit spectral features near energies associated with free and bound exciton transitions, with th
Externí odkaz:
http://arxiv.org/abs/cond-mat/0606427
We study spin dynamics of excitons confined in self-assembled CdSe quantum dots by means of optical orientation in magnetic field. At zero field the exciton emission from QDs populated via LO phonon-assisted absorption shows a circular polarization o
Externí odkaz:
http://arxiv.org/abs/cond-mat/0411036
Autor:
Mackowski, S., Gurung, T., Jackson, H. E., Smith, L. M., Heiss, W., Kossut, J., Karczewski, G.
We observe a strong dependence of the exciton spin relaxation in CdTe quantum dots on the average dot size and the depth of the confining potential. For the excitons confined to the as-grown CdTe quantum dots we find the spin relaxation time to be 4.
Externí odkaz:
http://arxiv.org/abs/cond-mat/0409507
Autor:
Gurung, T., Mackowski, S., Jackson, H. E., Smith, L. M., Heiss, W., Kossut, J., Karczewski, G.
We show that through the resonant optical excitation of spin-polarized excitons into CdMnTe magnetic quantum dots, we can induce a macroscopic magnetization of the Mn impurities. We observe very broad (4 meV linewidth) emission lines of single dots,
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408658
Autor:
Hewaparakrama, K. P., Mackowski, S., Jackson, H. E., Smith, L. M., Karczewski, G., Kossut, J.
We demonstrate sub-wavelength imaging of excitons confined to single CdTe quantum dots. By combining slit-confocal microscopy with a hemispherical solid immersion lens we simultaneously map the emission of thousands of single quantum dots with a spat
Externí odkaz:
http://arxiv.org/abs/cond-mat/0408545
Autor:
Mackowski, S., Gurung, T., Nguyen, T. A., Jackson, H. E., Smith, L. M., Karczewski, G., Kossut, J.
We demonstrate that resonant excitation of CdMnTe self-assembled quantum dots creates an ensemble of spin-polarized magnetic polarons at B=0 T. The strong spatial confinement characteristic of quantum dots significantly increases the stability of mag
Externí odkaz:
http://arxiv.org/abs/cond-mat/0403298
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