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首页> 外文期刊>Physical review >High-fidelity optical preparation and coherent Larmor precession of a single hole in an (In,Ga)As quantum dot molecule
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High-fidelity optical preparation and coherent Larmor precession of a single hole in an (In,Ga)As quantum dot molecule

机译：（In，Ga）As量子点分子中单孔的高保真光学制备和相干Larmor进动

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摘要

We employ ultrafast pump-probe spectroscopy with photocurrent readout to directly probe the dynamics of a single hole spin in a single, electrically tunable self-assembled quantum dot molecule formed by vertically stacking (In,Ga)As quantum dots. Excitons with defined spin configurations are initialized in one of the two dots using circularly polarized picosecond pulses. The time-dependent spin configuration is probed by the spin selective optical absorption of the resulting few fermion complex. Taking advantage of sub-5 ps electron tunneling to an orbitally excited state of the other dot, we initialize a single hole spin with a purity of >96%, i.e., much higher than demonstrated in previous single dot experiments. Measurements in a lateral magnetic field monitor the coherent Larmor precession of the single hole spin with no observable loss of spin coherence within the ～300 ps hole lifetime. Thereby, the purity of the hole spin initialization remains unchanged for all investigated magnetic fields.
机译：我们采用具有光电流读数的超快泵浦光谱技术，直接探测由垂直堆叠（In，Ga）As量子点形成的单个可电调谐自组装量子点分子中单个空穴自旋的动力学。使用圆极化皮秒脉冲在两个点之一中初始化具有定义的自旋配置的激子。随时间变化的自旋构型通过所产生的少量费米络合物的自旋选择性光学吸收来探测。利用低于5 ps的电子隧穿到另一个点的轨道激发态，我们初始化了一个单孔自旋，其纯度> 96％，即比以前的单点实验所证明的要高得多。在横向磁场中的测量监测了单孔自旋的相干拉莫尔进动，在〜300 ps的孔寿命内没有观察到自旋相干的损失。因此，对于所有研究的磁场，空穴自旋初始化的纯度保持不变。

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  • 来源
    《Physical review》 |2012年第24期|p.241306.1-241306.4|共4页
  • 作者

    K. Mueller; A. Bechtold; C. Ruppert; C. Hautmann; J. S. Wildmann; T. Kaldewey; M. Bichler; H. J. Krenner; G. Abstreiter; M. Betz; J. J. Finley;

  • 作者单位

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Experimentelle Physik 2, TU Dortmund, 44221 Dortmund, Germany;

    Experimentelle Physik 2, TU Dortmund, 44221 Dortmund, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Lehrstuhl fur Experimentalphysik 1 and Augsburg Centre for Innovative Technologies (ACIT), Universitat Augsburg, Universitdtsstrasse. 1, 86159 Augsburg, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

    Experimentelle Physik 2, TU Dortmund, 44221 Dortmund, Germany;

    Walter Schottky Institut and Physik Department, Technische Universitaet Muenchen, Am Coulombwall 4, 85748 Garching, Germany;

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  • 正文语种 eng
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  • 关键词

    quantum dots; quantum well devices (quantum dots, quantum wires, etc.);

    机译：量子点;量子阱设备（量子点;量子线等）;

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