Dichroic spin–valley photocurrent in monolayer molybdenum disulphide

Mustafa Eginligil, Bingchen Cao, Zilong Wang, Xiaonan Shen, Chunxiao Cong, Jingzhi Shang, Cesare Soci and Ting Yu ()
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Mustafa Eginligil: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Bingchen Cao: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Zilong Wang: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Xiaonan Shen: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Chunxiao Cong: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Jingzhi Shang: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Cesare Soci: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University
Ting Yu: School of Physical and Mathematical Sciences, Physics and Applied Physics, Nanyang Technological University

Nature Communications, 2015, vol. 6, issue 1, 1-7

Abstract: Abstract The aim of valleytronics is to exploit confinement of charge carriers in local valleys of the energy bands of semiconductors as an additional degree of freedom in optoelectronic devices. Thanks to strong direct excitonic transitions in spin-coupled K valleys, monolayer molybdenum disulphide is a rapidly emerging valleytronic material, with high valley polarization in photoluminescence. Here we elucidate the excitonic physics of this material by light helicity-dependent photocurrent studies of phototransistors. We demonstrate that large photocurrent dichroism (up to 60%) can also be achieved in high-quality molybdenum disulphide monolayers grown by chemical vapour deposition, due to the circular photogalvanic effect on resonant excitations. This opens up new opportunities for valleytonic applications in which selective control of spin–valley-coupled photocurrents can be used to implement polarization-sensitive light-detection schemes or integrated spintronic devices, as well as biochemical sensors operating at visible frequencies.

Date: 2015
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DOI: 10.1038/ncomms8636

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