Photocontrol of Dirac electrons in a bulk Rashba semiconductor

N. Ogawa; M. S. Bahramy; Y. Kaneko; Y. Tokura

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Photocontrol of Dirac electrons in a bulk Rashba semiconductor

机译：Rashba体半导体中Dirac电子的光控

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We demonstrate the generation of circularly polarized light induced current of bulk Dirac electrons at room temperature by exploiting a giant Rashba effect in a bulk semiconductor. The photocurrent is spin polarized due to the Spin-momentum locking of the electronic states, which is manifested by a sign reversal upon flipping either the photon helicity or the sign of the Rashba parameter, without any stray current. The action spectra revealed the photon energy range, where the photocurrent is carried by the Dirac electrons at the inner Fermi surface. This photogalvanic control is enabled by the sizable spin splittings both at the valence and conduction bands with the same helicity, and also by a number of optical transition pathways compared to those in the two-dimensional Rashba systems. An efficient coupling between the photon field and large spin-orbit interaction is accordingly proposed to allow the universal control of Dirac electrons.

机译：我们通过在体半导体中利用巨大的Rashba效应来证明在室温下体Dirac电子的圆偏振光感应电流的产生。由于电子状态的自旋动量锁定，光电流自旋极化，这通过翻转光子螺旋度或Rashba参数的符号时的符号反转来体现，而没有任何杂散电流。作用谱揭示了光子能量范围，其中光电流由内费米表面的狄拉克电子携带。通过在具有相同螺旋度的价带和导带处进行相当大的自旋分裂，以及通过与二维Rashba系统中的光学跃迁路径相比，可以实现这种光电流控制。因此，提出了光子场与大自旋轨道相互作用之间的有效耦合，以实现对狄拉克电子的普遍控制。

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《Physical review》 |2014年第12期|125122.1-125122.6|共6页
作者
N. Ogawa; M. S. Bahramy; Y. Kaneko; Y. Tokura;
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RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan;

RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan,Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan;

RIKEN Center for Emergent Matter Science (CEMS), Wako, Saitama 351-0198, Japan,Department of Applied Physics and Quantum Phase Electronics Center (QPEC), University of Tokyo, Tokyo 113-8656, Japan;

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photoconduction and photovoltaic effects; spin-orbit coupling, zeeman and stark splitting, jahn-teller effect; magnetooptical effects; magnetoelectronics; spintronics: devices exploiting spin polarized transport or integrated magnetic fields;

机译：光电导和光电效应;自旋轨道耦合;塞曼和斯塔克分裂;詹恩-泰勒效应;磁光效应;磁电子学自旋电子学：利用自旋极化传输或集成磁场的设备;

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专利

1. Terahertz radiation by subpicosecond spin-polarized photocurrent originating from Dirac electrons in a Rashba-type polar semiconductor [J] . Yuto Kinoshita, Noriaki Kida, Tatsuya Miyamoto, Physical Review. B, Condensed Matter . 2018,第16期

机译：Rashba型极性半导体中源自狄拉克电子的亚皮秒自旋极化光电流引起的太赫兹辐射
2. Terahertz radiation by subpicosecond spin-polarized photocurrent originating from Dirac electrons in a Rashba-type polar semiconductor [J] . Kinoshita Yuto, Kida Noriaki, Miyamoto Tatsuya, Physical review, B . 2018,第16期

机译：通过在Rashba型极性半导体中的源自Dirac电子的旋转旋转光电流的Terahertz辐射
3. Landau Level Spectroscopy of Dirac Electrons in a Polar Semiconductor with Giant Rashba Spin Splitting [J] . Sandor Bordacs, Joseph G. Checkelsky, Hiroshi Murakawa, Physical review letters . 2013,第16期

机译：具有大Rashba自旋分裂的极性半导体中狄拉克电子的Landau能级光谱
4. A numerically efficient semiconductor model with Fermi-Dirac thermalization dynamics (band-filling) for FDTD simulation of optoelectronic and photonic devices [C] . Huang, Y., Ho, . 2005

机译：具有费米-狄拉克热化动力学（带填充）的数值有效半导体模型，用于光电和光子器件的FDTD仿真
5. Electronic and optical properties of bulk semiconductors, superlattices, and alloy semiconductors. [D] . Ghahramani, Edwin. 1990

机译：体半导体，超晶格和合金半导体的电子和光学特性。
6. Chiral-like tunneling of electrons in two-dimensional semiconductors with Rashba spin-orbit coupling [O] . Yee Sin Ang, Zhongshui Ma, C. Zhang -1

机译：具有Rashba自旋轨道耦合的二维半导体中电子的手性状隧穿
7. Landau Level Spectroscopy of Dirac Electrons in a Polar Semiconductor with Giant Rashba Spin Splitting [O] . Bordács, Sándor, Checkelsky, Joseph G., Murakawa, Hiroshi, 2013

机译：极地半导体中Dirac电子的Landau能级光谱与巨型Rashba旋转分裂
8. Shubnikow-de Haas Oscillations in the Bulk Rashba Semiconductor BiTeI. [R] . Bell, C., Bahramy, M. S., Murakawa, H., 2012

机译：shubnikow-de Haas在Bulk Rashba semiconductor BiTeI中的振荡。

Photocontrol of Dirac electrons in a bulk Rashba semiconductor

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