Rashba, Emmanuel2016-01-112011Rashba, Emmanuel I. 2011. “Mechanism of Half-Frequency Electric Dipole Spin Resonance in Double Quantum Dots: Effect of Nonlinear Charge Dynamics Inside the Singlet Manifold.” Physical Review B 84 (24) (December). doi:10.1103/physrevb.84.241305.1098-0121http://nrs.harvard.edu/urn-3:HUL.InstRepos:24080430Near a neutrality point separating two different singlet charged states of a double quantum dot, charge dynamics inside a 2 × 2 singlet manifold can be described by a 1/2 pseudospin. In this region, charge dynamics is highly nonlinear and strongly influenced by flopping its soft pseudospin mode. As a result, the responses to external driving include first and second harmonics of the driving frequency and their Raman satellites shifted by the pseudospin frequency. In EDSR spectra of a spin-orbit couplet doublet dot, they manifest themselves as charge satellites of spin-flip transitions. The theory describes gross features of the anomalous half-frequency EDSR in spin blockade spectra [E. A. Laird et al., Semicond. Sci. Technol. 24, 064004 (2009)].en-USJournal Article2015-12-18Emmanuel I. Rashba2016-01-1110.1103/PhysRevB.84.241305