Ultrafast photoinduced melting of a spin-Peierls phase in an organic charge-transfer compound, K-tetracyanoquinodimethane.
Ultrafast photoinduced melting of a spin-Peierls phase in an organic charge-transfer compound, K-tetracyanoquinodimethane.
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DOI：
10.1103/physrevlett.96.037405
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发表时间：
2006-01
影响因子：
8.6
通讯作者：
Hiroshi Okamoto;K. Ikegami;T. Wakabayashi;Y. Ishige;J. Togo;Hideo Kishida;Hiroyuki Matsuzaki
中科院分区：
文献类型：
--
作者：
Hiroshi Okamoto;K. Ikegami;T. Wakabayashi;Y. Ishige;J. Togo;Hideo Kishida;Hiroyuki Matsuzaki
利用飞秒反射光谱研究了四氰基醌二甲烷（K-TCNQ）自旋Peierls（SP）体系的超快光致相变。光载流子使SP相不稳定，导致在400 fs内分子二聚化减少。SP相的这种熔化驱动三种相干振荡。通过与二聚化激活的拉曼带的比较，我们发现20 cm-1的振荡是由LO声子引起的，它对SP相位的稳定起着重要作用.
Ultrafast photoinduced phase transition in a spin-Peierls (SP) system of K-tetracyanoquinodimethane (K-TCNQ) was studied by femtosecond (fs) reflection spectroscopy. Photocarriers destabilize the SP phase, resulting in a decrease in molecular dimerization within 400 fs. Such a melting of the SP phase drives three kinds of coherent oscillations. By comparing the oscillations with the Raman bands activated by the dimerization, we show that the oscillation of 20 cm-1 is due to an LO phonon, and it plays an important role for the stabilization of the SP phase.