Attosecond Time-Domain Measurement of Core-Level-Exciton Decay in Magnesium Oxide

被引：59

作者：

Geneaux, Romain ^{[1
]}

Kaplan, Christopher J. ^{[1
]}

Yue, Lun ^{[2
]}

Ross, Andrew D. ^{[1
]}

Baekhoj, Jens E. ^{[2
]}

Kraus, Peter M. ^{[1
]}

Chang, Hung-Tzu ^{[1
]}

Guggenmos, Alexander ^{[1
]}

Huang, Mi-Ying ^{[1
]}

Zurch, Michael ^{[1
]}

Schafer, Kenneth J. ^{[2
]}

Neumark, Daniel M. ^{[1
,3
]}

Gaarde, Mette B. ^{[2
]}

Leone, Stephen R. ^{[1
,3
,4
]}

机构：

[1] Univ Calif Berkeley, Dept Chem, Berkeley, CA 94720 USA

[2] Louisiana State Univ, Dept Phys & Astron, Baton Rouge, LA 70803 USA

[3] Lawrence Berkeley Natl Lab, Chem Sci Div, Berkeley, CA 94720 USA

[4] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

来源：

PHYSICAL REVIEW LETTERS | 2020年 / 124卷 / 20期

关键词：

X-RAY-EMISSION; VIBRATIONAL STRUCTURE; PHONON RELAXATION; LINE-SHAPES; PHOTOEMISSION; DYNAMICS; SPECTRA; STATES; MGO;

D O I：

10.1103/PhysRevLett.124.207401

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Excitation of ionic solids with extreme ultraviolet pulses creates localized core-level excitons, which in some cases couple strongly to the lattice. Here, core-level-exciton states of magnesium oxide are studied in the time domain at the Mg L-2,L-3 edge with attosecond transient reflectivity spectroscopy. Attosecond pulses trigger the excitation of these short-lived quasiparticles, whose decay is perturbed by time-delayed near-infrared pulses. Combined with a few-state theoretical model, this reveals that the infrared pulse shifts the energy of bright (dipole-allowed) core-level-exciton states as well as induces features arising from dark core-level excitons. We report coherence lifetimes for the two lowest core-level excitons of 2.3 +/- 0.2 and 1.6 +/- 0.5 fs and show that these are primarily a consequence of strong exciton-phonon coupling, disclosing the drastic influence of structural effects in this ultrafast relaxation process.

引用

页数：6

共 43 条

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