A tunable time-resolved spontaneous Raman spectroscopy setup for probing ultrafast collective excitation and quasiparticle dynamics in quantum materials

被引：20

作者：

Versteeg, R. B. ^{[1
]}

Zhu, J. ^{[1
]}

Padmanabhan, P. ^{[1
]}

Boguschewski, C. ^{[1
]}

German, R. ^{[1
]}

Goedecke, M. ^{[1
]}

Becker, P. ^{[2
]}

van Loosdrecht, P. H. M. ^{[1
]}

机构：

[1] Univ Cologne, Phys Inst 2, Zulpicher Str 77, D-50937 Cologne, Germany

[2] Univ Cologne, Inst Geol & Mineral, Abt Kristallog, Zulpicher Str 49b, D-50674 Cologne, Germany

来源：

STRUCTURAL DYNAMICS-US | 2018年 / 5卷 / 04期

关键词：

SCATTERING; LIGHT; TRANSITION; ENERGY; PHASE; SI;

D O I：

10.1063/1.5037784

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

We present a flexible and efficient ultrafast time-resolved spontaneous Raman spectroscopy setup to study collective excitation and quasi-particle dynamics in quantum materials. The setup has a broad energy tuning range extending from the visible to near infrared spectral regions for both the pump excitation and Raman probe pulses. Additionally, the balance between energy and time-resolution can be controlled. A high light collecting efficiency is realized by high numerical aperture collection optics and a high-throughput flexible spectrometer. We demonstrate the functionality of the setup with a study of the zone-center longitudinal optical phonon and hole continuum dynamics in silicon and discuss the role of the Raman tensor in time-resolved Raman scattering. In addition, we show an evidence for unequal phonon softening rates at different high symmetry points in the Brillouin zone of silicon by means of detecting pump-induced changes in the two-phonon overtone spectrum. Demagnetization dynamics in the helimagnet Cu2OSeO3 is studied by observing softening and broadening of a magnon after photo-excitation, underlining the unique power of measuring transient dynamics in the frequency domain, and the feasibility to study phase transitions in quantum materials. (C) 2018 Author(s).

引用

页数：16

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