Generation and detection of nuclear spin entanglement in semiconductor quantum dots

半导体量子点中核自旋纠缠的产生和检测

• 批准号: 23340091
• 负责人: ONO Keiji
• 金额: $ 13.23万
• 依托单位: The Institute of Physical and Chemical Research
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2011
• 资助国家: 日本
• 起止时间: 2011-04-01 至 2014-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-23340091/
• 关键词: 半導体; 量子ドット; スピン; 核スピン; エンタングルメント

We observe a singlet spin blockade (SSB) in two-electron vertical double quantum dots where the single-electron transport is blocked for spin singlet electrons. In contrast to the conventional Pauli spin blockade with spin triplet electrons, this singlet spin blockade is observed under high magnetic field, where the doubly occupied states in one of the dots go beyond the singlet-triplet ground-state transition. The SSB region in Coulomb diamond measurements is in agreementwith the two-electron excitation spectrum. A leakage current of 10 pA order is observed in SSB, consistent with the spin singlet lifetime due to random nuclear spin fluctuations. This results are published in Appl.Phys.Lett

我们在双电子垂直双量子点中观察到了单重态自旋阻塞（SSB）现象，即自旋单重态电子的单电子输运被阻塞。与传统的泡利自旋封锁与自旋三重态电子相比，这种单重态自旋封锁在高磁场下观察到，其中一个点中的双占据态超越了单重态-三重态基态跃迁。库仑金刚石测量的SSB区与双电子激发谱一致。在SSB中观察到10 pA量级的漏电流，这与由于随机核自旋涨落引起的自旋单重态寿命一致。这一结果发表在《应用物理学通讯》上

项目成果

Steady-State Solution for Dark States Using a Three-Level System in Coupled Quantum Dots

• DOI: 10.1143/jjap.51.02bj07
• 发表时间: 2011-09
• 期刊: Japanese Journal of Applied Physics
• 影响因子: 1.5
• 作者: T. Tanamoto;K. Ono;F. Nori

Spin blockade in a double quantum dot containing three electrons

• DOI: 10.1103/physrevb.89.085302
• 发表时间: 2014-02
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: S. Amaha;W. Izumida;T. Hatano;S. Tarucha;K. Kono;K. Ono

Level broadening effect in electron tunneling through double quantum dots with different g factors

不同 g 因子双量子点电子隧道中的能级展宽效应

• 发表时间: 2011
• 期刊: Jpn.J.Appl.Phys.
• 作者: S.M.Huang;Y.Tokura;H.Akimoto;K.Kono;J.J.Lin;S.Tarucha;K.Ono
• 通讯作者: K.Ono

Pauli Spin Blockade and Influence of Hyperfine Interaction in Vertical Quantum Dot Molecule with Six-electrons

六电子垂直量子点分子中泡利自旋封锁及超精细相互作用的影响

• 发表时间: 2011
• 期刊: J.Phys.Soc.Jpn.
• 作者: S.Amaha;T.Kodera;T.Hatano;K.Ono;Y.Tokura;S.Tarucha;J.A.Gupta;D.G.Austing
• 通讯作者: D.G.Austing

Dynamic polarization and resistive detection of nuclear spins in a quantum dot under the Kondo effect regime

近藤效应下量子点中核自旋的动态极化和电阻检测

• 发表时间: 2013
• 作者: M. Kawamura;D. Gottwald;K. Ono;T. Machida;K. Kono
• 通讯作者: K. Kono