2018/06/30 by Zhi-Hai Liu, O. Entin‐Wohlman, O. Entin-Wohlman +3
Physics and Astronomy · #Anisotropy #Condensed matter physics #Coupling (piping) #Electron #Exchange interaction #Ferromagnetism #Field (mathematics) #Isotropy #Magnetic field #Magnetic properties of thin films #Materials science #Nanodot #Nanowire #Optoelectronics #Physics #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Quantum dot #Quantum mechanics #Spin (aerodynamics) #Spin–orbit interaction #Superexchange #Zeeman effect #Zeeman energy #cond-mat.mes-hall #quant-ph
paper · pdf · doi:10.1103/physrevb.98.241303
published as Phys. Rev. B 98, 241303 (2018); Rapid Communication · 7 pages, 4 figures plus supplemental material
arxiv created 2018/10/03 · openalex publication_date 2018/12/14 · arxiv updated 2019/04/12 · openalex created_date 2019/06/27 · openalex updated_date 2026/08/05
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)], we obtain the complete features of the SOC in an InSb nanowire DQD.