THz-Frequency Modulation of the Hubbard U in an Organic Mott Insulator

被引：66

作者：

Singla, R. ^{[1
]}

Cotugno, G. ^{[1
,2
]}

Kaiser, S. ^{[1
,7
,8
]}

Foerst, M. ^{[1
]}

Mitrano, M. ^{[1
]}

Liu, H. Y. ^{[1
]}

Cartella, A. ^{[1
]}

Manzoni, C. ^{[1
,4
]}

Okamoto, H. ^{[5
]}

Hasegawa, T. ^{[6
]}

Clark, S. R. ^{[2
,9
]}

Jaksch, D. ^{[2
,3
]}

Cavalleri, A. ^{[1
,2
]}

机构：

[1] Max Planck Inst Struct & Dynam Matter, D-22761 Hamburg, Germany

[2] Univ Oxford, Dept Phys, Clarendon Lab, Oxford OX1 3PU, England

[3] Natl Univ Singapore, Ctr Quantum Technol, Singapore 117543, Singapore

[4] Politecn Milan, Dipartimento Fis, CNR, IFN, I-20133 Milan, Italy

[5] Univ Tokyo, Dept Adv Mat Sci, Chiba 2778561, Japan

[6] Natl Inst Adv Ind Sci & Technol, Tsukuba, Ibaraki 3058562, Japan

[7] Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany

[8] Univ Stuttgart, Phys Inst 4, D-70550 Stuttgart, Germany

[9] Univ Bath, Dept Phys, Bath BA2 7AY, Avon, England

来源：

PHYSICAL REVIEW LETTERS | 2015年 / 115卷 / 18期

基金：

英国工程与自然科学研究理事会; 欧洲研究理事会;

关键词：

OPTICAL-ABSORPTION; SUPERCONDUCTIVITY; PULSES; STATES; PHASE;

D O I：

10.1103/PhysRevLett.115.187401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use midinfrared pulses with stable carrier-envelope phase offset to drive molecular vibrations in the charge transfer salt ET-F(2)TCNQ, a prototypical one-dimensional Mott insulator. We find that the Mott gap, which is probed resonantly with 10 fs laser pulses, oscillates with the pump field. This observation reveals that molecular excitations can coherently perturb the electronic on-site interactions (Hubbard U) by changing the local orbital wave function. The gap oscillates at twice the frequency of the vibrational mode, indicating that the molecular distortions couple quadratically to the local charge density.

引用

页数：6

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