Sub-10 fs spectroscopy of K-TCNQ crystal for observation of intramolecular vibration modulation in melting of the Peierls dimer

被引：9

作者：

Nakata, Kazuaki ^{[1
]}

Tokunaga, Eiji ^{[1
]}

Du, Juan ^{[2
,3
,4
]}

Xue, Bing ^{[2
,3
,4
]}

Miyazaki, Jun ^{[2
,3
,4
]}

Seto, Keisuke ^{[2
,3
,4
]}

Kobayashi, Takayoshi ^{[2
,3
,4
,5
,6
]}

机构：

[1] Tokyo Univ Sci, Fac Sci, Dept Phys, Shinjuku Ku, Tokyo 1628601, Japan

[2] Univ Electrocommun, Adv Ultrafast Laser Res Ctr, Chofu, Tokyo 1828585, Japan

[3] Univ Electrocommun, Dept Engn Sci, Chofu, Tokyo 1828585, Japan

[4] Japan Sci & Technol Agcy, Core Res Evolut Sci & Technol, Chiyoda Ku, Tokyo 1020076, Japan

[5] Natl Chiao Tung Univ, Dept Electrophys, Hsinchu 300, Taiwan

[6] Osaka Univ, Inst Laser Engn, Suita, Osaka 5650971, Japan

来源：

PHYSICAL REVIEW B | 2014年 / 90卷 / 08期

关键词：

OPTICAL PARAMETRIC AMPLIFICATION; LOW-TEMPERATURE; TETRACYANOQUINODIMETHANE; ANION; TRANSITIONS; SPECTRUM; SALTS;

D O I：

10.1103/PhysRevB.90.085119

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

K-TCNQ crystals show photoinduced phase transition (PIPT) between a Mott insulator and a spin Peierls (SP) phase, having T-c = 395 K (= and the crystal has T-c = 395 K of the PIPT). We report the intra-molecular vibrations in the excited K-TCNQ crystal after impulsive excitation using a sub 9.4 fs pulse laser in the reflection spectrum. The frequencies of the vibrations are close to the Raman frequencies of molecules. The frequencies increase with melting of the SP phase, and then decrease with rearrangement of the dimerization. In addition, the frequencies of the vibrations are time-resolved to be modulated by the intermolecular optical phonon with 510 fs period corresponding to 65 cm(-1). This modulation is associated with the periodical change of coupling strengths of intermolecular charge transfer and/or the dipolar coupling between the counterpart molecules in the neighboring chains.

引用

页数：5

共 26 条

[1]

[Anonymous], ADV SPECTROSCOPY

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