2 research outputs found
Quantum transport through MoS constrictions defined by photodoping
We present a device scheme to explore mesoscopic transport through molybdenum
disulfide (MoS) constrictions using photodoping. The devices are based on
van-der-Waals heterostructures where few-layer MoS 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 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/hBN heterostructure. Low temperature two- and four-terminal
transport measurements show evidence of quantum confinement effects.Comment: 9 pages, 6 figure