Excitation of coherent phonons in the one-dimensional Bi(114) surface

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 popul...

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Published in:Physical review letters 2013-03, Vol.110 (13), p.136806-136806, Article 136806
Main Authors: Leuenberger, D, Yanagisawa, H, Roth, S, Dil, J H, Wells, J W, Hofmann, P, Osterwalder, J, Hengsberger, M
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container_issue 13
container_start_page 136806
container_title Physical review letters
container_volume 110
creator Leuenberger, D
Yanagisawa, H
Roth, S
Dil, J H
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Hofmann, P
Osterwalder, J
Hengsberger, M
description 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.
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title Excitation of coherent phonons in the one-dimensional Bi(114) surface
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