Manifestation of unconventional biexciton states in quantum dots

Manifestation of unconventional biexciton states in quantum dots
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量子点中非常规双激子态的表现

DOI:
10.1038/ncomms6721
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发表时间:
2014
影响因子:
16.6
通讯作者:
Hoffmann
Hoffmann
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Hönig;Callsen;Schliwa;Kalinowski;Kindel;ArakawaY;Bimberg;Hoffmann

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虽然半导体激子由费米子系统(电子和空穴)组成,但它们携带类似于库珀电子对的整数净自旋。虽然后者通过形成玻色-爱因斯坦凝聚而导致超导性,但激子凝聚受到例如电子-空穴对的快速辐射衰变的阻碍。在这里,我们调查的行为的两个电子-空穴对的量子点与纤锌矿晶体结构引起的电荷载流子分离的基础上,大的自发和压电极化,从而减少载流子重叠,因此衰减概率。作为一个直接的结果,我们发现一个混合双激子复杂的水分子样的电荷分布,使异常的自旋配置。与具有s =0的净自旋的常规双激子复合物相比,混合双激子的自旋位数=±3,导致除了急剧增强的电荷载流子结合能之外的完全不同的光致发光特征。因此,通过暗激子的双激子级联可以增强的温度上升,证实了光子互相关测量。
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
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DOI: --
发表时间: 2011
期刊:
影响因子: --
作者:
S. Schulz;D. Mourad;S. Schumacher;G. Czycholl
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量子点亚稳态自旋封锁双激子的辐射级联
DOI: 10.1103/physrevb.82.155329
发表时间: 2010
期刊: Physical Review B
影响因子: 3.7
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