Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V29: Hybrid Systems: Coupling to Ensembles and Single Electrons in Helium
2:30 PM–5:30 PM,
Thursday, March 7, 2019
BCEC
Room: 162A
Sponsoring
Unit:
DQI
Chair: Charlotte Boettcher
Abstract: V29.00012 : Transport measurements of electrons above shallow helium-filled microchannels*
5:06 PM–5:18 PM
Presenter:
Abraham Asfaw
(Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA)
Authors:
Abraham Asfaw
(Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA)
Ethan Kleinbaum
(Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA)
Stephen Aplin Lyon
(Department of Electrical Engineering, Princeton University, Princeton, NJ 08544, USA)
In this talk, we report transport measurements of electrons on helium in a microchannel device where the channels are 200 nm deep and 3 μm wide. The channels are fabricated above amorphous metallic TaWSi, which has surface roughness below 1 nm and minimal variations in work function across the surface due to the absence of polycrystalline grains. We are able to set the electron density in the channels using a ground plane, obtaining electron densities as high as 2.56×109 cm-2. We also demonstrate control of the transport using a barrier which enables pinchoff at a central microchannel connecting two reservoirs. The mobility of electron transport through the central microchannel is at least 300 cm2/Vs.
*This research was supported by the NSF (Grant Nos. DMR-1506862 and DMR-1420541).
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