Spin orbit field in a physically defined p type MOS silicon double quantum dot

• URL: http://arxiv.org/abs/2003.07079v2
• Date: Wed, 18 Mar 2020 03:01:21 GMT
• Title: Spin orbit field in a physically defined p type MOS silicon double quantum dot
• Authors: Marian Marx, Jun Yoneda, \'Angel Guti\'errez Rubio, Peter Stano, Tomohiro Otsuka, Kenta Takeda, Sen Li, Yu Yamaoka, Takashi Nakajima, Akito Noiri, Daniel Loss, Tetsuo Kodera and Seigo Tarucha
• Abstract summary: We investigate the spin orbit (SO) field in a physically defined, p type metal oxide semiconductor double quantum dot in silicon. We find that the spin flip of a tunneling hole is due to a SO field pointing to the double dot axis and almost fully out of the quantum well plane.
• Score: 7.272152812337904
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We experimentally and theoretically investigate the spin orbit (SO) field in a physically defined, p type metal oxide semiconductor double quantum dot in silicon. We measure the magnetic field dependence of the leakage current through the double dot in the Pauli spin blockade. A finite magnetic field lifts the blockade, with the lifting least effective when the external and SO fields are parallel. In this way, we find that the spin flip of a tunneling hole is due to a SO field pointing perpendicular to the double dot axis and almost fully out of the quantum well plane. We augment the measurements by a derivation of SO terms using group symmetric representations theory. It predicts that without in plane electric fields (a quantum well case), the SO field would be mostly within the plane, dominated by a sum of a Rashba and a Dresselhaus like term. We, therefore, interpret the observed SO field as originated in the electric fields with substantial in plane components.

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