Bulletin of the American Physical Society
APS March Meeting 2019
Volume 64, Number 2
Monday–Friday, March 4–8, 2019; Boston, Massachusetts
Session V02: Topological Materials -- Mesoscopic and Novel Probes
2:30 PM–5:18 PM,
Thursday, March 7, 2019
BCEC
Room: 107A
Sponsoring
Unit:
DMP
Chair: Valla Fatemi, Yale Univ
Abstract: V02.00004 : Surface Repair and Passivation of InAs Quantum Wells with ALD*
3:06 PM–3:18 PM
Presenter:
Sebastian Pauka
(School of Physics, Univ of Sydney)
Authors:
Sebastian Pauka
(School of Physics, Univ of Sydney)
James Witt
(School of Physics, Univ of Sydney)
Cioffi Nicole Murphy
(Microsoft Station Q Sydney)
Geoffrey C. Gardner
(Microsoft Station Q Purdue)
Sergei Gronin
(Microsoft Station Q Purdue)
Tian Wang
(Microsoft Station Q Purdue)
Candice Thomas
(Microsoft Station Q Purdue)
Michael Manfra
(Microsoft Station Q Purdue)
David Reilly
(Microsoft Station Q Sydney)
Maja C Cassidy
(Microsoft Station Q Sydney)
In this work, we report on the use of Al2O3 grown by ALD, with in-situ surface pre-treatment via TMA pulses or an Ar/H plasma, to repair and passivate the surface after processing, and demonstrate the reduction of charged surface states. We show that by this method, we are able to enhance the measured carrier mobility of these devices up to ~45000 cm2/(V s). Finally, the spin orbit length is extracted as a function of density, controlled using a global top-gate, to determine spin-scattering mechanisms. Our results provide a path towards high quality, shallow 2DEG-based Majorana devices.
*This work was supported by funding from Microsoft Station Q.
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