Momentum-resolved excited-electron lifetimes on stepped Cu(775)

Shen, Xin; Kwak, Hyung-Tae; Radojevic, Antonije M.; Smadici, S.; Mocuta, D.; Osgood, Richard M.

doi:10.1016/s0009-2614(01)01356-2

Cited by 23 publications

(14 citation statements)

References 34 publications

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“…5,6,7,8,9,10,11,12 The lifetime of bulk and surface holes below the Fermi level has been investigated by employing high-resolution angle-resolved photoemission (ARP) techniques. 13,14,15,16,17,18,19,20 The scanning tunneling microscope (STM) has also been used to determine the lifetime of both surface-state holes and electrons in the noble metals Cu, Ag, and Au.…”

Section: Introductionmentioning

confidence: 99%

“…Recently, two-photon photoemission (2PPE) and timeresolved 2PPE (TR-2PPE) spectroscopies have provided accurate measurements of the lifetime of both bulk and surface electrons with energies below the vacuum level. 5,6,7,8,9,10,11,12 The lifetime of bulk and surface holes below the Fermi level has been investigated by employing high-resolution angle-resolved photoemission (ARP) techniques. 13,14,15,16,17,18,19,20 The scanning tunneling microscope (STM) has also been used to determine the lifetime of both surface-state holes and electrons in the noble metals Cu, Ag, and Au.…”

Section: Introductionmentioning

confidence: 99%

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Role of occupieddbands in the dynamics of excited electrons and holes in Ag

et al. 2003

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The role that occupied d bands play in the inelastic lifetime of bulk and surface states in Ag is investigated from the knowledge of the quasiparticle self-energy. In the case of bulk electrons, sp bands are taken to be free-electron like. For surface states, the surface band structure of sp states is described with the use of a realistic one-dimensional hamiltonian. The presence of occupied d states is considered in both cases by introducing a polarizable background. We obtain inelastic lifetimes of bulk electrons that are in good agreement with first-principles band-structure calculations. Our surface-state lifetime calculations indicate that the agreement with measured lifetimes of both crystal-induced and image-potential induced surface states on Ag(100) and Ag (111) is considerably improved when the screening of d electrons is taken into account.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Role of occupieddbands in the dynamics of excited electrons and holes in Ag

et al. 2003

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“…[61][62][63][64][65][66][67][68][69][70][71][72][73] Inelastic lifetimes due to electron-electron scattering can be obtained from quasiparticle self-energy calculations, usually within the GW approximation. 70,[74][75][76][77] Direct simulations of the evolution of photoexcited electron distributions in time-resolved 2PPE have been performed in the framework of density matrix theory.…”

Section: Introductionmentioning

confidence: 99%

Analysis of two-photon photoemission from Si(001)

Husser

Pehlke

2012

Phys. Rev. B

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We have applied our ab initio simulation approach for the photoemission process at solid surfaces to calculate two-photon photoemission spectra from the p(2 × 2)-reconstructed Si(001) surface. In this approach, the groundstate electronic structure of the surface is obtained within density functional theory. The subsequent timedependent simulation is carried through at frozen effective potential, while an optical potential is applied to account for inelastic scattering in the excited state. We have derived normal emission spectra for sand p-polarized light with photon energies in the rangehω = 3.85-4.75 eV. The dependence of the theoretical spectra on photon energy and polarization is analyzed and compared to experimental spectra from the literature. To unravel the role of the unoccupied states between Fermi energy and the vacuum level which are acting as intermediate states in the excitation process, we investigate the expression for the two-photon photocurrent from perturbation theory. The scattering states, which serve as the final states of photoemission, are obtained from a time-dependent simulation of a LEED-type experiment. The evaluation of the dipole matrix elements allows us to identify the relevant bulk band transitions and to address the influence of surface states.

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“…Today, several ways to experimentally investigate lifetimes of surface localized electron states have been presented, ARPES [2][3][4][5][6][7][8], Two-photon photoemission (2PPE) techniques [9,10], Time resolved two-photon photoemission technique for direct determination of excitation lifetimes [11][12][13][14][15][16][17][18][19][20][21][22] and different methods based on STM [23][24][25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%