Correlation in low-dimensional electronic states on metal surfaces

Menzel, A.; Zhang, Zh.; Minca, Mariana; Loerting, Thomas; Deisl, C.; Bertel, E.

doi:10.1088/1367-2630/7/1/102

Cited by 16 publications

(24 citation statements)

References 53 publications

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“…Collective excitations other than phonons, or even an altogether different mechanism, may be the origin of kinks detected at 40 meV in the dispersion of surface states of Ni(110) [8]. Surface states of ferromagnetic Fe (110) show similar kinks at 100-200 meV [9], and even at 300 meV in Pt(110) -far beyond any phononic energy scale [10]. Kinks at unusually high energies are also found in transition-metal oxides [11,12,13,14,15], where the Coulomb interaction leads to strong correlations, e.g., at 150 meV in SrVO 3 [16].…”

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confidence: 97%

Kinks in the dispersion of strongly correlated electrons

et al. 2007

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The properties of condensed matter are determined by single-particle and collective excitations and their interactions. These quantum-mechanical excitations are characterized by an energy E and a momentum \hbar k which are related through their dispersion E_k. The coupling of two excitations may lead to abrupt changes (kinks) in the slope of the dispersion. Such kinks thus carry important information about interactions in a many-body system. For example, kinks detected at 40-70 meV below the Fermi level in the electronic dispersion of high-temperature superconductors are taken as evidence for phonon or spin-fluctuation based pairing mechanisms. Kinks in the electronic dispersion at binding energies ranging from 30 to 800 meV are also found in various other metals posing questions about their origins. Here we report a novel, purely electronic mechanism yielding kinks in the electron dispersions. It applies to strongly correlated metals whose spectral function shows well separated Hubbard subbands and central peak as, for example, in transition metal-oxides. The position of the kinks and the energy range of validity of Fermi-liquid (FL) theory is determined solely by the FL renormalization factor and the bare, uncorrelated band structure. Angle-resolved photoemission spectroscopy (ARPES) experiments at binding energies outside the FL regime can thus provide new, previously unexpected information about strongly correlated electronic systems.Comment: 8 pages, 5 figure

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confidence: 97%

Kinks in the dispersion of strongly correlated electrons

et al. 2007

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“…The low-energy kinks in high-temperature superconductors [2-4] at 40-70 meV are hence taken as evidence for an electron-phonon [2,3] or a spin-fluctuation [4, 5] pairing mechanism. Besides these low-energy kinks, kinks at higher energies have been reported, not only in cuprates [6-9] but also in various transition metals [10,11] and transition metal oxides [12][13][14][15]. These kinks are at 50-800 meV, often beyond the relevant bosonic energy scales associated with phonons or non-local spin fluctuations.On the theoretical side, kinks at similarly high energies have been found by serendipity in local density approximation plus dynamical mean field theory (LDA+DMFT) [16][17][18][19][20][21] calculations of SrVO 3 [22].…”

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confidence: 99%

Poor Man’s Understanding of Kinks Originating from Strong Electronic Correlations

Held¹,

Peters²,

Toschi³

2013

Phys. Rev. Lett.

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By means of dynamical mean field theory calculations, it was recently discovered that kinks generically arise in strongly correlated systems, even in the absence of external bosonic degrees of freedoms such as phonons. However, the physical mechanism behind these kinks remained unclear. On the basis of the perturbative and numerical renormalization group theory, we herewith identify these kinks as the effective Kondo energy scale of the interacting lattice system which is shown to be smaller than the width of the central peak.

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“…Our model system is the c2 2-Br=Pt110 surface [11,12] [see Fig. 1(a) and 1(b); other surface structures mentioned below are also defined in Fig.…”

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confidence: 99%

“…The second part is a Lorentzian function characterizing fluctuations in the system. As the interactions along and perpendicular to the close-packed rows are vastly different [12], a separate analysis for both directions was carried out. To test the reliability and reproducibility of the experimental decomposition we analyzed two different sets of measurements.…”

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confidence: 99%

Fluctuations and Phase Separation in a Quasi-One-Dimensional System

et al. 2007

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Phase transitions in a quasi-one-dimensional surface system on a metal substrate are investigated as a function of temperature. Upon cooling the system shows a loss of long-range order, fluctuations, and a transition into an inhomogeneous ground state due to competition of local adsorbate-adsorbate interactions with an incommensurate charge density wave. This agrees with a general phase diagram for correlated systems and high-temperature superconductors. The model surface system allows direct imaging of the fluctuations and the glassy inhomogeneous ground state by scanning tunneling microscopy.

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Correlation in low-dimensional electronic states on metal surfaces

Cited by 16 publications

References 53 publications

Kinks in the dispersion of strongly correlated electrons

Kinks in the dispersion of strongly correlated electrons

Poor Man’s Understanding of Kinks Originating from Strong Electronic Correlations

Fluctuations and Phase Separation in a Quasi-One-Dimensional System

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