Observation of site-controlled localized charged excitons in CrI3/WSe2 heterostructures

Arunabh Mukherjee, Kamran Shayan, Lizhong Li, Jie Shan, Kin Fai Mak and A. Nick Vamivakas ()
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Arunabh Mukherjee: University of Rochester
Kamran Shayan: University of Rochester
Lizhong Li: Cornell University
Jie Shan: Cornell University
Kin Fai Mak: Cornell University
A. Nick Vamivakas: University of Rochester

Nature Communications, 2020, vol. 11, issue 1, 1-8

Abstract: Abstract Isolated spins are the focus of intense scientific exploration due to their potential role as qubits for quantum information science. Optical access to single spins, demonstrated in III-V semiconducting quantum dots, has fueled research aimed at realizing quantum networks. More recently, quantum emitters in atomically thin materials such as tungsten diselenide have been demonstrated to host optically addressable single spins by means of electrostatic doping the localized excitons. Electrostatic doping is not the only route to charging localized quantum emitters and another path forward is through band structure engineering using van der Waals heterojunctions. Critical to this second approach is to interface tungsten diselenide with other van der Waals materials with relative band-alignments conducive to the phenomenon of charge transfer. In this work we show that the Type-II band-alignment between tungsten diselenide and chromium triiodide can be exploited to excite localized charged excitons in tungsten diselenide. Leveraging spin-dependent charge transfer in the device, we demonstrate spin selectivity in the preparation of the spin-valley state of localized single holes. Combined with the use of strain-inducing nanopillars to coordinate the spatial location of tungsten diselenide quantum emitters, we uncover the possibility of realizing large-scale deterministic arrays of optically addressable spin-valley holes in a solid state platform.

Date: 2020
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DOI: 10.1038/s41467-020-19262-2

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