Control of the two-electron exchange interaction in a nanowire double quantum dot

Zhi Hai Liu, O. Entin-Wohlman, A. Aharony, J. Q. You

Research output: Contribution to journalArticlepeer-review


The two-electron exchange coupling in a nanowire double quantum dot (DQD) is shown to possess Moriya's anisotropic superexchange interaction under the influence of both the Rashba and Dresselhaus spin-orbit couplings (SOCs) and a Zeeman field. We reveal the controllability of the anisotropic exchange interaction via tuning the SOC and the direction of the external magnetic field. The exchange interaction can be transformed into an isotropic Heisenberg interaction, but the uniform magnetic field becomes an effective inhomogeneous field whose measurable inhomogeneity reflects the SOC strength. Moreover, the presence of the effective inhomogeneous field gives rise to an energy-level anticrossing in the low-energy spectrum of the DQD. By fitting the analytical expression for the energy gap to the experimental spectroscopic detections [S. Nadj-Perge et al., Phys. Rev. Lett. 108, 166801 (2012)PRLTAO0031-900710.1103/PhysRevLett.108.166801], we obtain the complete features of the SOC in an InSb nanowire DQD.

Original languageEnglish
Article number241303
JournalPhysical Review B
Issue number24
StatePublished - 14 Dec 2018


FundersFunder number
Israel Ministry of Science and Technology3-11173
National Natural Science Foundation of ChinaU1530401, 11774022
Israel Science Foundation
PAZY Foundation
National Basic Research Program of China (973 Program)2016YFA0301200


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