A spectroscopic view of electron–phonon coupling at metal surfaces

Tang, S.-J.; Shi, Junren; Wu, Biao; Sprunger, P. T.; Yang, Wanli; Brouet, V.; Zhou, Xingjiang; Hussain, Zahid; Shen, Zhi‐Xun; Zhang, Zhenyu; Plummer, E. W.

doi:10.1002/pssb.200404890

Cited by 18 publications

(13 citation statements)

References 35 publications

(53 reference statements)

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“…3(c) is the resulting energy dispersion obtained from the MDCs. A kink is observable near the binding energy ~60 meV, consistent with previous measurements [18][19][20][21][22][23].…”

Section: Methodssupporting

confidence: 90%

“…Note that all the reported experimental , , for Be(0001) Γ surface state are in the range of 40-50 meV at 50 meV binding energy [19,[21][22][23], which further questions the theoretical ELF [25] . As discussed in Fig.…”

Section: Discussionmentioning

confidence: 95%

“…These early experiments have been followed by many other investigations with better signal to noise or a slightly different analysis procedure [9,[18][19][20][21][22][23]. The reported mass enhancement for Be (0001) ranges from ~0.6 [21,22] to ~1 [18][19][20], which has been tabulated in a review [22]. Later, the inconsistency in experimental values of for Be(0001) was found to be the result of an anisotropic EPC [23].…”

Section: Introductionmentioning

confidence: 99%

“…In fact, Be(0001) was used in the first seminal papers describing APRES measurements of the band renormalization due to EPC, first by Jensen's group in 1998 [18] and then by the Baer's group in 1999 [19,20]. These early experiments have been followed by many other investigations with better signal to noise or a slightly different analysis procedure [9,[18][19][20][21][22][23]. The reported mass enhancement for Be (0001) ranges from ~0.6 [21,22] to ~1 [18][19][20], which has been tabulated in a review [22].…”

Section: Introductionmentioning

confidence: 99%

“…, , is related to the lifetime of quasiparticles, resulting in rapid increase in the spectrum width as a function of binding energy, saturating at the highest phonon energy [18][19][20][21][22][23][34][35][36].…”

Section: Introductionmentioning

confidence: 99%

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Electron-phonon coupling in a system with broken symmetry: Surface ofBe(0001)

Chien

et al. 2015

Phys. Rev. B

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The momentum-resolved Eliashberg function (ELF), , , for the Be(0001) zone-center surface state was extracted from the high-quality angle-resolved photoemission spectroscopy (ARPES) data at the Fermi energy in the Γ direction, displaying ten peaks. A comparison of the peaks in the ELF to the bulk phonon density of states (DOS) and the bulk and surface phonon dispersion allows for an identification of the origin of all but two of the peaks. The five high energy peaks (> 52 meV) are associated with the coupling of the surface state to bulk phonon modes. The peaks at 44.5 meV and at 49.0 meV have contributions from both the bulk and surface phonons. The most intense peak at 37.5 meV is evidently having contribution from EPC of the surface state to the surface Rayleigh phonon mode. Surprisingly, the two lowest energy modes, which must be associated with surface Rayleigh phonon, cannot be attributed to a high phonon DOS at the surface nor to any Fermi surface nesting. After detail analysis, the three lowest energy peaks are associated with momentum dependence in the EPC matrix, reflected in the phonon line-width changes. As a result of the broken symmetry at the surface, coupling of the initial surface state due to the presence of the surface phonons contributes ~48.5±12.5% of the spectral weight in the ELF and ~6 6.5±10.5% to the mass enhancement ( ).

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“…3(c) is the resulting energy dispersion obtained from the MDCs. A kink is observable near the binding energy ~60 meV, consistent with previous measurements [18][19][20][21][22][23].…”

Section: Methodssupporting

confidence: 90%

Section: Discussionmentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Electron-phonon coupling in a system with broken symmetry: Surface ofBe(0001)

Chien

et al. 2015

Phys. Rev. B

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Electron–Phonon Interaction at Interfaces

Hofmann

Chulkov

Sklyadneva

2010

Dynamics at Solid State Surfaces and Interfaces

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Many-body effects and their interplay are at the heart of some of the most interesting problems in condensed matter physics, and frequently the simultaneous presence of different effects is found in complex materials. The electron-phonon (eÀph) interaction is one such effect that limits the lifetime of excited electrons (or holes) and has long been studied because of its role in many phenomena, from electrical conductivity to electronic heat capacity and BCS-type superconductivity. Several experimental techniques such as tunneling spectroscopy or heat capacity measurements have provided information on the electron-phonon coupling strength averaged over the bulk Fermi surface of metals [1].Experimentally, recent advances in angle-resolved photoemission (ARPES) have opened the opportunity for a study of many-body effects in unprecedented detail. Most importantly, studies are not confined to averages over the Fermi surface but detailed information about the energy and k-dependence of the interaction has come within reach. This permits, for instance, to establish the symmetry of the superconducting gap in novel superconductors [2,3].The eÀph interaction stands out as a fundamental many-body process that can be tested by both experimental and theoretical methods. Much has been learned by studying the eÀph coupling on carefully chosen electronic surface states, for which good arguments can be made for the eÀph interaction to be the only many-body effect giving rise to a bosonic spectroscopic signature. Surface states have also played an important role because they have, as do the states in the cuprates, a merely two-dimensional dispersion, an essential prerequisite for the analysis of ARPES data.In the most simple picture, the eÀph coupling changes the dispersion and the lifetime of the electronic states in a material. This situation is illustrated in Figure 7.1a. Very close to the Fermi level, within a typical phonon energy hv D , the dispersion is renormalized such that it is flatter at the Fermi energy. Consequently, the effective mass of the electrons at the Fermi level and the density of states are

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