Gilbert Simeon J, Yi Hemian, Chen Jia-Shiang, Yost Andrew J, Dhingra Archit, Abourahma Jehad, Lipatov Alexey, Avila Jose, Komesu Takashi, Sinitskii Alexander, Asensio Maria C, Dowben Peter A
Department of Physics and Astronomy, University of Nebraska-Lincoln, Lincoln, Nebraska 68588-0299, United States.
Synchrotron SOLEIL and Université Paris-Saclay, L'Orme des Merisiers, BP48, 91190 Saint-Aubin, France.
ACS Appl Mater Interfaces. 2020 Sep 9;12(36):40525-40531. doi: 10.1021/acsami.0c11892. Epub 2020 Aug 28.
Photocurrent production in quasi-one-dimensional (1D) transition-metal trichalcogenides, TiS(001) and ZrS(001), was examined using polarization-dependent scanning photocurrent microscopy. The photocurrent intensity was the strongest when the excitation source was polarized along the 1D chains with dichroic ratios of 4:1 and 1.2:1 for ZrS and TiS, respectively. This behavior is explained by symmetry selection rules applicable to both valence and conduction band states. Symmetry selection rules are seen to be applicable to the experimental band structure, as is observed in polarization-dependent nanospot angle-resolved photoemission spectroscopy. Based on these band symmetry assignments, it is expected that the dichroic ratios for both materials will be maximized using excitation energies within 1 eV of their band gaps, providing versatile polarization sensitive photodetection across the visible spectrum and into the near-infrared.
使用偏振相关扫描光电流显微镜研究了准一维（1D）过渡金属三硫属化物TiS(001)和ZrS(001)中的光电流产生。当激发源沿1D链偏振时，光电流强度最强，ZrS和TiS的二向色比分别为4:1和1.2:1。这种行为可以用适用于价带和导带状态的对称性选择规则来解释。正如在偏振相关纳米点角分辨光电子能谱中观察到的那样，对称性选择规则被认为适用于实验能带结构。基于这些能带对称性分配，预计使用带隙1 eV范围内的激发能量将使两种材料的二向色比最大化，从而在可见光谱和近红外范围内提供通用的偏振敏感光检测。
