著者

Hosokawa S. Inui M. Kajihara Y. Matsuda K. Ichitsubo T. Pilgrim W. -C. Sinn H. Gonzalez L. E. Gonzalez D. J. Tsutsui S. Baron A. Q. R.

出版者

American Physical Society

雑誌

PHYSICAL REVIEW LETTERS (ISSN:00319007)

巻号頁・発行日

vol.102, no.10, 2009-03

被引用文献数

125

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The transverse acoustic excitation modes were detected by inelastic x-ray scattering in liquid Ga in the Q range above 9  nm-1 although liquid Ga is mostly described by a hard-sphere liquid. An ab initio molecular dynamics simulation clearly supports this finding. From the detailed analysis for the S(Q, ω) spectra with a good statistic quality, the lifetime of 0.5 ps and the propagating length of 0.4–0.5 nm can be estimated for the transverse acoustic phonon modes, which may correspond to the lifetime and size of cages formed instantaneously in liquid Ga.

著者

Konabe S. Matsuda K. Okada S.

出版者

American Physical Society

雑誌

Physical review letters (ISSN:00319007)

巻号頁・発行日

vol.109, no.18, pp.187403, 2012-10

被引用文献数

9 4

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We theoretically study the phase relaxation of excitons in doped single-walled carbon nanotubes caused by elastic scattering between an exciton and an electron. Our calculation of the spectral linewidth, that is the inverse of the scattering rate, demonstrates that this dephasing process is unexpectedly suppressed in doped single-walled carbon nanotubes, giving rise to anomalous nonlinear behavior as a function of the electron density. A detailed investigation reveals that the logarithmic correction of the exciton self-energy plays a critical role in the exciton-carrier scattering dynamics.