title: Measuring quantum coherence in bulk solids using dual phase-locked optical pulses.
abstract: Electronic and phonon coherence are usually measured in different ways because their time-scales are very different. In this paper we simultaneously measure the electronic and phonon coherence using the interference of the electron-phonon correlated states induced by two phase-locked optical pulses. Interferometric visibility showed that electronic coherence remained in a semiconducting GaAs crystal until ~40 fs; in contrast, electronic coherence disappeared within 10 fs in a semimetallic Bi crystal at room temperature, differing substantially from the long damping time of its phonon coherence, in the picosecond range.
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Shingo
authors.initials: S
authors.lastname: Hayashi
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Keigo
authors.initials: K
authors.lastname: Kato
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Katsura
authors.initials: K
authors.lastname: Norimatsu
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] PRESTO, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Hada
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Yosuke
authors.initials: Y
authors.lastname: Kayanuma
authors.affiliation: 1] Materials and Structures Laboratory, Tokyo Institute of Technology, R3-10, Nagatsuta 4259, Yokohama 226-8503, Japan [2] CREST, Japan Science and Technology Agency, Kawaguchi 332-0012, Japan.
authors.forename: Kazutaka G
authors.initials: KG
authors.lastname: Nakamura