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arXiv · 1612.01118

Quantum transport through MoS$_2$ constrictions defined by photodoping

Alexander Epping·Luca Banszerus·Johannes Güttinger·Luisa Krückeberg·Kenji Watanabe·Takashi Taniguchi·Fabian Hassler·Bernd Beschoten·Christoph Stampfer
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Abstract

We present a device scheme to explore mesoscopic transport through molybdenum disulfide (MoS$_2$) constrictions using photodoping. The devices are based on van-der-Waals heterostructures where few-layer MoS$_2$ flakes are partially encapsulated by hexagonal boron nitride (hBN) and covered by a few-layer graphene flake to fabricate electrical contacts. Since the as-fabricated devices are insulating at low temperatures, we use photo-induced remote doping in the hBN substrate to create free charge carriers in the MoS$_2$ layer. On top of the device, we place additional metal structures, which define the shape of the constriction and act as shadow masks during photodoping of the underlying MoS$_2$/hBN heterostructure. Low temperature two- and four-terminal transport measurements show evidence of quantum confinement effects.

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Alexander Epping, Luca Banszerus, Johannes Güttinger, Luisa Krückeberg, Kenji Watanabe, Takashi Taniguchi, Fabian Hassler, Bernd Beschoten, Christoph Stampfer. 2016-12-04. Quantum transport through MoS$_2$ constrictions defined by photodoping. https://doi.org/10.1088/1361-648x%2Faabbb8

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