title: Picosecond carrier dynamics induced by coupling of wavefunctions in a Si-nanodisk array fabricated by neutral beam etching using bio-nano-templates.
abstract: The picosecond carrier dynamics in a closely packed Si-nanodisk (Si-ND) array with ultrathin potential barrier fabricated by neutral beam etching using bio-nano-templates was investigated by time-resolved photoluminescence (PL). The PL decay curves were analyzed as a function of photon energy by the global fitting method. We show three spectral components with different decay times, where the systematic energy differences of the spectral peaks are clarified: 2.03 eV for the fastest decaying component with a decay time τ = 40 ps, 2.02 eV for τ = 300 ps, and 2.00 eV for τ = 1.6 ns. These energy separations ranging from 10 to 30 meV among the emissive states can be attributed to the coupling of wavefunctions of carriers between neighboring NDs.
authors.affiliation: Graduate School of Information Science and Technology, Hokkaido University, Kita 14, Nishi 9, Kita-ku, Sapporo, 060-0814, Japan. tkiba@ist.hokudai.ac.jp.
authors.forename: Takayuki
authors.initials: T
authors.lastname: Kiba
authors.forename: Yoshiya
authors.initials: Y
authors.lastname: Mizushima
authors.forename: Makoto
authors.initials: M
authors.lastname: Igarashi
authors.forename: Seiji
authors.initials: S
authors.lastname: Samukawa
authors.forename: Akihiro
authors.initials: A
authors.lastname: Murayama