Abstract
We study in theory the generation and detection of electron spin coherence in nonlinear optical spectroscopy of semiconductor quantum dots doped with single electrons. In third-order differential transmission spectra, the inverse width of the ultranarrow peak at degenerate pump and probe frequencies gives the longitudinal spin relaxation time $({T}_{1})$, and that of the Stokes and anti-Stokes spin resonances gives the spin dephasing time including the inhomogeneous broadening $({T}_{2}^{*})$. The transverse spin relaxation time excluding the inhomogeneous broadening effect $({T}_{2})$ can be measured by the inverse width of ultranarrow hole-burning resonances in fifth-order differential transmission spectra.
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