Zobrazeno 1 - 10
of 118
pro vyhledávání: '"Efros, Al. L."'
Autor:
Benchamekh, R., Gippius, N. A., Even, J., Nestoklon, M. O., Jancu, J. -M., Ithurria, S., Dubertret, B., Efros, Al. L., Voisin, P.
CdSe nanoplatelets show perfectly quantized thicknesses of few monolayers. They present a situation of extreme, yet well defined quantum confinement. Due to large dielectric contrast between the semiconductor and its ligand environment, interaction b
Externí odkaz:
http://arxiv.org/abs/1311.5404
Publikováno v:
Phys. Rev. B 88, 245311 (2013)
We study the dependence of the quantum yield of photoluminescence of a dense, periodic array of semiconductor nanocrystals (NCs) on the level of doping and NC size. Electrons introduced to NCs via doping quench photoluminescence by the Auger process,
Externí odkaz:
http://arxiv.org/abs/1310.0849
We present a theoretical description of excitons and positively and negatively charged trions in "giant" CdSe/CdS core-shell nanocrystals (NCs). The developed theory provides the parameters describing the fine structure of excitons in CdSe/CdS core/t
Externí odkaz:
http://arxiv.org/abs/1211.1053
Publikováno v:
Phys. Rev. B 85, 041303(R) (2012)
We predict a new physical mechanism explaining the electron spin precession frequency focusing effect observed recently in singly charged quantum dots exposed to a periodic train of resonant circularly polarized short optical pulses [A. Greilich et a
Externí odkaz:
http://arxiv.org/abs/1103.3249
A theory of the electronic structure and excitonic absorption spectra of PbS and PbSe nanowires and nanorods in the framework of a four-band effective mass model is presented. Calculations conducted for PbSe show that dielectric contrast dramatically
Externí odkaz:
http://arxiv.org/abs/1010.6047
Publikováno v:
Physical Review B 80, 104436 (2009)
A description of spin Faraday rotation, Kerr rotation and ellipticity signals for single- and multi-layer ensembles of singly charged quantum dots (QDs) is developed. The microscopic theory considers both the single pump-pulse excitation and the effe
Externí odkaz:
http://arxiv.org/abs/0905.1254
Autor:
Greilich, A., Spatzek, S., Yugova, I. A., Akimov, I. A., Yakovlev, D. R., Efros, Al. L., Reuter, D., Wieck, A. D., Bayer, M.
Publikováno v:
Phys. Rev. B 79, 201305(R) (2009)
We show that the spins of all electrons, each confined in a quantum dot of an (In,Ga)As/GaAs dot ensemble, can be driven into a single mode of precession about a magnetic field. This regime is achieved by allowing only a single mode within the electr
Externí odkaz:
http://arxiv.org/abs/0811.1783
Publikováno v:
Physical Review Letters 102, 017402 (2009)
We study the low-temperature magneto-photoluminescence (PL) from individual CdSe nanocrystals. Nanocrystals having a small "bright" exciton fine structure splitting ($<$0.5 meV) exhibit a conventional left- and right-circularly polarized Zeeman PL do
Externí odkaz:
http://arxiv.org/abs/0809.1116
Publikováno v:
Phys. Rev. Lett. 100, 179702 (2008)
In a recent Letter [PRL 96, 226802 (2006)], Dalpian and Chelikowsky claimed that formation energies of Mn impurities in CdSe nanocrystals increase as the size of the nanocrystal decreases, and argued that this size dependence leads to "self-purificat
Externí odkaz:
http://arxiv.org/abs/0805.0280
Autor:
Greilich, A., Wiemann, M., Hernandez, F. G. G., Yakovlev, D. R., Yugova, I. A., Shabaev, A., Efros, Al. L., Reuter, D., Wieck, A. D., Bayer, M.
Publikováno v:
Phys. Rev. B 75, 233301 (2007)
Using the recently reported mode locking effect we demonstrate a highly robust control of electron spin coherence in an ensemble of (In,Ga)As quantum dots during the single spin coherence time. The spin precession in a transverse magnetic field can b
Externí odkaz:
http://arxiv.org/abs/0704.0177