Journal ArticleDOI
Electron-Hole Droplet Formation in Direct-Gap Semiconductors Observed by Mid-Infrared Pump-Probe Spectroscopy
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Mid-infrared pump-probe measurements with subpicosecond time resolution reveal the existence of a metastable condensed phase of the electron-hole ensemble in a direct-gap semiconductor CuCl, and the observed resonance feature at Planck's over 2pi(omega)p/sqrt[3] allows us to obtain the carrier density in the metastable electron- hole droplets.Abstract:
Mid-infrared pump-probe measurements with subpicosecond time resolution reveal the existence of a metastable condensed phase of the electron-hole ensemble in a direct-gap semiconductor CuCl. High-density electrons and holes are directly created in a low-temperature state by the resonant femtosecond excitation of excitons above the Mott transition density. Strong metallic reflection with a plasma frequency Planck's over 2pi(omega)p approximately 0.5 eV builds up within 0.3 ps. Within a few picoseconds, the mid-infrared reflection spectrum is transformed from metalliclike into colloidlike. The observed resonance feature at Planck's over 2pi(omega)p/sqrt[3] allows us to obtain the carrier density in the metastable electron-hole droplets of 2x10(20) cm(-3).read more
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Journal ArticleDOI
Polariton lasing vs. photon lasing in a semiconductor microcavity
Hui Deng,Gregor Weihs,Gregor Weihs,David W. Snoke,Jacqueline Bloch,Yoshihisa Yamamoto,Yoshihisa Yamamoto +6 more
TL;DR: A series of experimental studies of a polariton laser are presented, exploring its properties as a relatively dense degenerate Bose gas and comparing it to a photon laser achieved in the same structure, finding its properties are similar to those of a normal photon laser.
Journal ArticleDOI
Ultrafast optical switching to a metallic state by photoinduced mott transition in a halogen-bridged nickel-chain compound.
Shinichiro Iwai,Shinichiro Iwai,Masanori Ono,A. Maeda,Hiroyuki Matsuzaki,Hideo Kishida,Hideo Kishida,Hiroshi Okamoto,Hiroshi Okamoto,Hiroshi Okamoto,Yasuhiro Tokura,Yasuhiro Tokura +11 more
TL;DR: The ultrafast photoinduced Mott transition from a charge transfer insulator to a metal in a halogen-bridged Ni-chain compound by pump-probe reflection spectroscopy is demonstrated by demonstrating the formation of a metallic state.
Journal ArticleDOI
Photoinduced phase transition in tetrathiafulvalene- p -chloranil observed in femtosecond reflection spectroscopy
Hiroshi Okamoto,Hiroshi Okamoto,Y. Ishige,Shu Tanaka,Hideo Kishida,Hideo Kishida,Shinichiro Iwai,Shinichiro Iwai,Yasuhiro Tokura,Yasuhiro Tokura +9 more
Journal ArticleDOI
Generalizations of the Bruggeman equation and a concept of shape-distributed particle composites.
TL;DR: The use of the Beta distribution for the particle shape is shown to result in some known as well as unknown equations of the effective medium theory, however, these equations yield no percolation threshold.
Journal ArticleDOI
Ultrafast Phase Control in One-Dimensional Correlated Electron Systems
TL;DR: In this paper, the authors review the ultrafast dynamics of three typical PIPTs observed in 1D correlated electron systems: a photoinduced transition from a Mott insulator to a metal in a halogen-bridged Ni-chain compound, [Ni(n) 2 Br]Br 2 (chxn = cyclohexanediamine); photoinduced melting of a spin-Peierls phase in an organic CT compound, K-tetracyanoquinodimethane (TCNQ); and a photo-induced transition between neutral (N)
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