Ultrafast dynamics of hot electrons and holes in copper: Excitation, energy relaxation, and transport effects

被引:243
作者
Knoesel, E [1 ]
Hotzel, A [1 ]
Wolf, M [1 ]
机构
[1] MPG, Fritz Haber Inst, D-14195 Berlin, Germany
关键词
D O I
10.1103/PhysRevB.57.12812
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Time-resolved two-photon photoemission (2PPE) at various photon energies is used to investigate the relaxation dynamics of hot electrons in Cu(111), applying auto-and cross-correlation techniques. The relaxation times vary from 250 fs at 0.1 eV above the Fermi level to 20 fs at 2 eV and show a strong wavelength dependence in the vicinity of the d-band feature in the 2PPE spectra. Electrons not directly excited from the d band exhibit a much longer relaxation time than d-band electrons excited to the same intermediate-state energy. We attribute these apparently longer lifetimes to a delayed electron generation via Auger decay of d-band holes. Based on a band structure calculation, a simulation of the ballistic transport effect and its implication on the observed electron relaxation dynamics is presented for the three low-index copper surfaces. These observations suggest that d-band holes have a substantially longer lifetime than excited sp-band electrons of the corresponding excitation energy.
引用
收藏
页码:12812 / 12824
页数:13
相关论文
共 60 条
  • [1] Competing nonradiative channels for hot electron induced surface photochemistry
    Aeschlimann, M
    Bauer, M
    Pawlik, S
    [J]. CHEMICAL PHYSICS, 1996, 205 (1-2) : 127 - 141
  • [2] AESCHLIMANN M, 1996, THESIS ETH ZURICH
  • [3] Anisimov S. I., 1975, SOV PHYS JETP, V39, P375, DOI DOI 10.1016/J.JMATPROTEC.2009.05.031
  • [4] MODEL FOR ELECTRON-STIMULATED AND PHOTON-STIMULATED DESORPTION
    ANTONIEWICZ, PR
    [J]. PHYSICAL REVIEW B, 1980, 21 (09): : 3811 - 3815
  • [5] Resonance lifetime and energy of an excited Cs state on Cu(111)
    Bauer, M
    Pawlik, S
    Aeschlimann, M
    [J]. PHYSICAL REVIEW B, 1997, 55 (15): : 10040 - 10043
  • [6] Bruesch P., 1986, PHONONS THEORY EXPT
  • [7] Femtosecond photoemission study of ultrafast electron dynamics on Cu(100)
    Cao, J
    Gao, Y
    Miller, RJD
    ElsayedAli, HE
    Mantell, DA
    [J]. PHYSICAL REVIEW B, 1997, 56 (03): : 1099 - 1102
  • [8] DEDERICHS PD, 1981, LONDOLTBORNSTEIN A, V13
  • [9] SURFACE FEMTOCHEMISTRY OF O-2 AND CO ON PT(111)
    DELIWALA, S
    FINLAY, RJ
    GOLDMAN, JR
    HER, TH
    MIEHER, WD
    MAZUR, E
    [J]. CHEMICAL PHYSICS LETTERS, 1995, 242 (06) : 617 - 622
  • [10] SELF-CONSISTENT RELATIVISTIC BAND-STRUCTURE OF THE NOBLE-METALS
    ECKARDT, H
    FRITSCHE, L
    NOFFKE, J
    [J]. JOURNAL OF PHYSICS F-METAL PHYSICS, 1984, 14 (01): : 97 - 112