Probing many-body quantum states in single InAs quantum dots: Terahertz and tunneling spectroscopy
Probing many-body quantum states in single InAs quantum dots: Terahertz and tunneling spectroscopy
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探测单个 InAs 量子点中的多体量子态：太赫兹和隧道光谱
DOI：
10.1103/physrevb.91.241301
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发表时间：
2015
影响因子：
3.7
通讯作者：
and K. Hirakawa
中科院分区：
文献类型：
--
作者：
Y. Zhang;K. Shibata;N. Nagai;C. Ndebeka-Bandou;G. Bastard;and K. Hirakawa
通过同时获得太赫兹（THz）子能级间跃迁谱和单电子隧穿谱，研究了单InAs量子点中的多体量子态。发现在少电子区测量的子能级间跃迁能系统地大于由输运测量确定的激发态（ES）能量。我们发现，隧道和太赫兹光谱探测相同的多体激发态的量子点，但它们的灵敏度取决于它们的选择规则。在多电子区，我们观察到太赫兹峰的能量与隧道ES相一致。
We have investigated the many-body quantum states in single InAs quantum dots (QDs) by simultaneously obtaining the terahertz (THz) intersublevel transition and single electron tunneling spectra. It is found that the intersublevel transition energies measured in the few-electron region are systematically larger than the excited state (ES) energies determined from the transport measurements. We show that tunneling and THz spectroscopy probe the same many-body excited states in the QDs, but their sensitivities depend on their selection rules. In the many-electron region, we observe THz peaks whose energies coincide with the tunneling ESs.