Robust Excitons and Trions in Monolayer MoTe2

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• 作者：Jiong Yang ; Tieyu L眉 ; Ye Win Myint ; Jiajie Pei ; Daniel Macdonald ; Jin-Cheng Zheng ; Yuerui Lu
• 刊名：ACS Nano
• 出版年：2015
• 出版时间：June 23, 2015
• 年：2015
• 卷：9
• 期：6
• 页码：6603-6609
• 全文大小：471K
• ISSN：1936-086X

文摘

Molybdenum telluride (MoTe₂) has emerged as a special member in the family of two-dimensional transition metal dichalcogenide semiconductors, owing to the strong spin鈥搊rbit coupling and relatively small energy gap, which offers new applications in valleytronic and excitonic devices. Here we successfully demonstrated the electrical modulation of negatively charged (X^{鈥?/sup>), neutral (X0), and positively charged (X+) excitons in monolayer MoTe₂ via photoluminescence spectroscopy. The binding energies of X+ and X鈥?/sup> were measured to be 鈭?4 and 鈭?7 meV, respectively.The exciton binding energy of monolayer MoTe₂ was measured to be 0.58 卤 0.08 eV via photoluminescence excitation spectroscopy, which matches well with our calculated value of 0.64 eV.}