Manifestation of unconventional biexciton states in quantum dots
Manifestation of unconventional biexciton states in quantum dots
复制标题
量子点中非常规双激子态的表现
DOI:
10.1038/ncomms6721
复制
发表时间:
2014
影响因子:
16.6
通讯作者:
Hoffmann
中科院分区:
文献类型:
--
作者:
Hönig;Callsen;Schliwa;Kalinowski;Kindel;ArakawaY;Bimberg;Hoffmann
Although semiconductor excitons consist of a fermionic subsystem (electron and hole), they carry an integer net spin similar to Cooper-electron-pairs. While the latter cause superconductivity by forming a Bose–Einstein-condensate, excitonic condensation is impeded by, for example, a fast radiative decay of the electron-hole pairs. Here, we investigate the behaviour of two electron-hole pairs in a quantum dot with wurtzite crystal structure evoking a charge carrier separation on the basis of large spontaneous and piezoelectric polarizations, thus reducing carrier overlap and consequently decay probabilities. As a direct consequence, we find a hybrid-biexciton complex with a water molecule-like charge distribution enabling anomalous spin configurations. In contrast to the conventional-biexciton complex with a net spin ofs=0, the hybrid-biexciton exhibitss=±3, leading to completely different photoluminescence signatures in addition to drastically enhanced charge carrier-binding energies. Consequently, the biexcitonic cascade via the dark exciton can be enhanced on the rise of temperature as approved by photon cross-correlation measurements.
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DOI:
--
发表时间:
2004
期刊:
Applied Physics Letters 8・5
影响因子:
--
作者:
K.Hoshino;S.Kako;Y.Arakawa
通讯作者:
Y.Arakawa
影响因子:
3.7
作者:
V. Zwiller;M. Pistol;D. Hessman;Rolf Cederstrom;W. Seifert;L. Samuelson
通讯作者:
V. Zwiller;M. Pistol;D. Hessman;Rolf Cederstrom;W. Seifert;L. Samuelson
影响因子:
3.7
作者:
Ostapenko, Irina A.;Hoenig, Gerald;Arakawa, Yasuhiko
通讯作者:
Arakawa, Yasuhiko
DOI:
--
发表时间:
2011
期刊:
影响因子:
--
作者:
S. Schulz;D. Mourad;S. Schumacher;G. Czycholl
通讯作者:
G. Czycholl
影响因子:
3.7
作者:
Kodriano Y
通讯作者:
Kodriano Y