Excitation of Coherent Phonons in the One-Dimensional Bi(114) Surface

被引：18

作者：

Leuenberger, D. ^{[1
]}

Yanagisawa, H. ^{[1
]}

Roth, S. ^{[1
]}

Dil, J. H. ^{[1
,2
]}

Wells, J. W. ^{[3
]}

Hofmann, P. ^{[4
,5
]}

Osterwalder, J. ^{[1
]}

Hengsberger, M. ^{[1
]}

机构：

[1] Univ Zurich, Inst Phys, CH-8057 Zurich, Switzerland

[2] Paul Scherrer Inst, Swiss Light Source, CH-5232 Villigen, Switzerland

[3] Norwegian Univ Sci & Technol, Dept Phys, N-7491 Trondheim, Norway

[4] Aarhus Univ, Dept Phys & Astron, DK-8000 Aarhus C, Denmark

[5] Aarhus Univ, Interdisciplinary Nanosci Ctr iNANO, DK-8000 Aarhus C, Denmark

来源：

PHYSICAL REVIEW LETTERS | 2013年 / 110卷 / 13期

基金：

瑞士国家科学基金会;

关键词：

ELECTRONIC-STRUCTURE; BISMUTH;

D O I：

10.1103/PhysRevLett.110.136806

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We present time-resolved photoemission experiments from a peculiar bismuth surface, Bi(114). The strong one-dimensional character of this surface is reflected in the Fermi surface, which consists of spin-polarized straight lines. Our results show that the depletion of the surface state and the population of the bulk conduction band after the initial optical excitation persist for very long times. The disequilibrium within the hot electron gas along with strong electron-phonon coupling cause a displacive excitation of coherent phonons, which in turn are reflected in coherent modulations of the electronic states. Beside the well-known A(1g) bulk phonon mode at 2.76 THz, the time-resolved photoelectron spectra reveal a second mode at 0.72 THz which can be attributed to an optical surface phonon mode along the atomic rows of the Bi(114) surface. DOI: 10.1103/PhysRevLett.110.136806

引用

页数：5

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