title: Transmission-grating-photomasked transient spin grating and its application to measurement of electron-spin ambipolar diffusion in (110) GaAs quantum wells.
abstract: A circular dichromatic transient absorption difference spectroscopy of transmission-grating-photomasked transient spin grating is developed and formularized. It is very simple in experimental setup and operation, and has high detection sensitivity. It is applied to measure spin diffusion dynamics and excited electron density dependence of spin ambipolar diffusion coefficient in (110) GaAs quantum wells. It is found that the spin ambipolar diffusion coefficient of (110) and (001) GaAs quantum wells is close to each other, but has an opposite dependence tendency on excited electron density. This spectroscopy is expected to have extensive applicability in the measurement of spin transport.
authors.affiliation: State-Key Laboratory of Optoelectronic Materials and Technologies, School of Physics and Engineering, Sun Yat-Sen University, Guangzhou, Guangdong 510275, China.
authors.forename: Ke
authors.initials: K
authors.lastname: Chen
authors.forename: Wenfang
authors.initials: W
authors.lastname: Wang
authors.forename: Jingda
authors.initials: J
authors.lastname: Wu
authors.forename: D
authors.initials: D
authors.lastname: Schuh
authors.forename: W
authors.initials: W
authors.lastname: Wegscheider
authors.forename: T
authors.initials: T
authors.lastname: Korn
authors.forename: Tianshu
authors.initials: T
authors.lastname: Lai
mesh_terms: D001152:Arsenicals / Q000737:chemistry*; D004058:Diffusion; D005708:Gallium / Q000737:chemistry*; D008027:Light; D012542:Scattering, Radiation; D013057:Spectrum Analysis / Q000379:methods*; D013113:Spin Labels
chemical_list: D001152:Arsenicals; D013113:Spin Labels; C043055:gallium arsenide; D005708:Gallium