Mingyuan Ge1, Jiepeng Rong1, Xin Fang1, Anyi Zhang1, Yunhao Lu2, and Chongwu Zhou1,3 ()
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1 Department of Chemical Engineering and Materials Science, University of Southern California, 3710 McClintock Ave, Los Angeles, CA 90089, USA 2 Department of Materials Science and Engineering, Zhejiang University, 38 Zheda Road, Hangzhou 310027, China 3 Department of Electrical Engineering, University of Southern California, 3710 McClintock Ave, Los Angeles, CA 90089, USA
Deposition of clean and defect-free atomically thin two-dimensional crystalline flakes on surfaces by mechanical exfoliation of layered bulk materials has proven to be a powerful technique, but it requires a fast, reliable and non-destructive way to identify the atomically thin flakes among a crowd of thick flakes. In this work, we provide general guidelines to identify ultrathin flakes of TaSe2 by means of optical microscopy and Raman spectroscopy. Additionally, we determine the optimal substrates to facilitate the optical identification of atomically thin TaSe2 crystals. Experimental realization and isolation of ultrathin layers of TaSe2 enables future studies on the role of the dimensionality in interesting phenomena such as superconductivity and charge density waves.