Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide

Liu Ro-Ya; Lin Meng-Kai; Chen Peng; Suzuki Takeshi; Clark Pip C. J.; Lewis Nathan K.; Cacho Cephise; Springate Emma; Chang Chia-Seng; Okazaki Kozo; Flavell Wendy; Matsuda Iwao; Chiang Tai-Chang

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Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide

机译：单层钨蛋白酶载体动力学对称性和旋转堵塞效应

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Understanding carrier creation and evolution in materials initiated by pulsed optical excitation is central to developing ultrafast optoelectronics. We demonstrate herein that the dynamic response of a system can be drastically modified when its physical dimension is reduced to the atomic scale, the ultimate limit of device miniaturization. A comparative study of single-layer (SL) tungsten diselenide (WSe2) relative to bulk WSe2 shows substantial differences in the transient response as measured by time- and angle-resolved photoemission spectroscopy (TRARPES). The conduction-band minimum in bulk WSe2, populated by optical pumping, decays promptly. The corresponding decay for SL WSe2 is much slower and exhibits two time constants. The results indicate the presence of two distinct decay channels in the SL that are correlated with the breaking of space inversion symmetry in the two-dimensional limit. This symmetry breaking lifts the spin degeneracy of the bands, which in turn causes the blockage of decay for one spin channel. The stark contrast between the single layer and the bulk illustrates the basic carrier scattering processes operating at different timescales that can be substantially modified by dimensional and symmetry-reduction effects.

机译：理解脉冲光学激发引发的材料的创建和演变是开发超快光电子的核心。我们展示在本文中，当其物理维度降低到原子尺度时，系统的动态响应可以大大修改，设备小型化的最终极限。单层（SL）钨（WSE2）相对于散装WSE2的比较研究显示了通过时间和角度分辨的光学激发光谱（特雷普）测量的瞬态响应的显着差异。通过光学泵浦填充的散装WSE2中的导通带最小值，默认。相应的SL WSE2衰减较慢，呈现两个时间常数。结果表明，在二维极限中与空间反转对称的断开相关的SL中存在两个不同的衰减通道。这种对称性断裂抬起带的旋转退化，这反过来导致衰减堵塞用于一个自旋通道。单层和散装之间的间隙对比示出了在不同时间尺寸操作的基本载体散射过程，其可以通过尺寸和对称性效应基本上修改。

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《Physical review》 |2019年第21期|214309.1-214309.6|共6页
作者
Liu Ro-Ya; Lin Meng-Kai; Chen Peng; Suzuki Takeshi; Clark Pip C. J.; Lewis Nathan K.; Cacho Cephise; Springate Emma; Chang Chia-Seng; Okazaki Kozo; Flavell Wendy; Matsuda Iwao; Chiang Tai-Chang;
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Univ Illinois Dept Phys Urbana IL 61801 USA|Acad Sinica Inst Phys Taipei 11529 Taiwan|Lawrence Berkeley Natl Lab Adv Light Source Berkeley CA 94720 USA|Univ Tokyo Inst Solid State Phys Chiba 2778581 Japan;

Univ Illinois Dept Phys Urbana IL 61801 USA;

Univ Illinois Dept Phys Urbana IL 61801 USA|Shanghai Jiao Tong Univ Sch Phys & Astron Shanghai Ctr Complex Phys Shanghai 200240 Peoples R China|Shanghai Jiao Ton Univ Sch Phys & Astron Shenyang Natl Lab Mat Sci Minist Educ Key Lab Artificial Struct & Quantum C Shanghai 200240 Peoples R China;

Univ Tokyo Inst Solid State Phys Chiba 2778581 Japan;

Univ Manchester Sch Phys & Astron Oxford Rd Manchester M13 9PL Lancs England|Univ Manchester Photon Sci Inst Oxford Rd Manchester M13 9PL Lancs England|Helmholtz Zentrum Berlin Mat & Energie GmbH Inst Solar Fuels Hahn Meitner Pl 1 D-14109 Berlin Germany;

Univ Manchester Sch Phys & Astron Oxford Rd Manchester M13 9PL Lancs England|Univ Manchester Photon Sci Inst Oxford Rd Manchester M13 9PL Lancs England;

STFC Rutherford Appleton Lab Cent Laser Facil Harwell OX11 0QX Berks England|Diamond Light Source Harwell Campus Didcot OX11 0DE Oxon England;

STFC Rutherford Appleton Lab Cent Laser Facil Harwell OX11 0QX Berks England;

Acad Sinica Inst Phys Taipei 11529 Taiwan;

Univ Tokyo Inst Solid State Phys Chiba 2778581 Japan;

Univ Manchester Sch Phys & Astron Oxford Rd Manchester M13 9PL Lancs England|Univ Manchester Photon Sci Inst Oxford Rd Manchester M13 9PL Lancs England;

Univ Tokyo Inst Solid State Phys Chiba 2778581 Japan;

Univ Illinois Dept Phys Urbana IL 61801 USA;

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Symmetry-breaking and spin-blockage effects on carrier dynamics in single-layer tungsten diselenide

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