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Description:

To probe the sources of scattering, we use a cooled scanning probe microscope (SPM) to image the flow of electrons in a MoS2 Hall bar sample at 4.2 K. Capacitive coupling to the SPM tip changes the electron density below and scatters electrons flowing nearby; an image of flow can be obtained by measuring the change in resistance between two contacts as the tip is raster scanned across the sample. We present images of current flow through a large contact that decay exponentially away from the sample edge. In addition, the images show the characteristic “bullseye” pattern of Coulomb blockade conductance rings around a quantum dot as the density is depleted with a back gate. We estimate the size and position of these quantum dots using a capacitive model.

Rights:

• cc-by-3.0
  

Keyword: MoS2, scanning probe microscope, quantum dots

Date published: 2018-10-19

Publisher: IOP Publishing

Journal:

• Nanotechnology (ISSN: 13616528) vol. 29 issue. 42

Funding:

• National Institute for Materials Science
• Army Research Office W911NF-14-1-0247
• Air Force Office of Scientific Research FA9550-14-1-0268
• Basic Energy Sciences DE-FG02-07ER46422

Manuscript type: Publisher's version (Version of record)

MDR DOI:

First published URL: https://doi.org/10.1088/1361-6528/aad79f

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Updated at: 2025-02-23 22:49:46 +0900

Published on MDR: 2025-02-23 22:49:46 +0900