Experimental Band Structure of Na

Jensen, E.; Plummer, E. W.

doi:10.1103/physrevlett.55.1912

Cited by 258 publications

(72 citation statements)

References 18 publications

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“…It directly measures the electronic structure of materials, and can provide valuable information on carrier masses and the interactions between electrons in the system. This has been applied to numerous two-dimensional (or quasi-two-dimensional systems), including surface states of noble metals (e.g., Cu [12,13], Ag and Au [14,15]), semiconductors [16][17][18][19][20], and metal oxides [21,22], and alkali metals grown as two-dimensional layers on metallic substrates [23][24][25][26][27][28]. Despite many of these systems being generally considered weakly interacting, there is hardly any example of a system which displays true nearly-free-electron behavior manifested by a parabolic band dispersion with an effective carrier mass m * = 1m e ).…”

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confidence: 99%

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

et al. 2016

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The electronic structure of a single Na monolayer on the surface of single-crystal HfSe2 is investigated using angle-resolved photoemission spectroscopy. We find that this system exhibits an almost perfect "nearly-free-electron" behavior with an extracted effective mass of ∼ 1me, in contrast to heavier masses found previously for alkali metal monolayers on other substrates. Our densityfunctional-theory calculations indicate that this is due to the large lattice constant, causing both exchange and correlation interactions to be suppressed, and to the weak hybridization between the overlayer and the substrate. This is therefore an ideal model system for understanding the properties of two-dimensional materials.

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confidence: 99%

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

et al. 2016

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“…[1][2][3][4][5] Particularly noteworthy is the fact that the experimentally determined 5 plasmon dispersion relation of the heavy alkali metals ͑Rb and Cs͒ is in complete disagreement with the textbook behavior expected for a ''simple'' metal. 6 The high-resolution electron energy loss spectroscopy ͑EELS͒ experiments of vom Felde, Sprösser-Prou, and Fink 5 revealed that, in the case of Cs, the dispersion of the plasmon energy for small wave vectors is negative.…”

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confidence: 99%

One-electron excitations, correlation effects, and the plasmon in cesium metal

1997

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We study the dynamical electronic response of Cs at a first-principles level. The spatially localized 5p semicore shell induces a physical interplay between crystal local fields and electron correlations, leading to a novel, and relatively large, many-body shift of the plasmon energy. This effect, combined with that of oneelectron transitions into empty states near the plasmon energy, yields a plasmon dispersion curve which is in excellent agreement with experiment for small wave vectors. In addition, our results feature a flat dispersion for large wave vectors, in qualitative agreement with experiment. ͓S0163-1829͑97͒07504-8͔

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“…Plummer and co-workers 52,53 carried out angle-resolved photoemission experiments on sodium and reported a bandwidth of 2.5-2.65 eV, significantly smaller than the free-electron and DFT-LDA value of ∼3.1 eV, and even the LDA+GW value of ∼2.8 eV.…”

Section: Resultsmentioning

confidence: 98%

Spectral functions of the uniform electron gas via coupled-cluster theory and comparison to theGWand related approximations

et al. 2016

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We use, for the first time, ab initio coupled-cluster theory to compute the spectral function of the uniform electron gas at a Wigner-Seitz radius of r s = 4. The coupled-cluster approximations we employ go significantly beyond the diagrammatic content of state-of-the-art GW theory. We compare our calculations extensively to GW and GW-plus-cumulant theory, illustrating the strengths and weaknesses of these methods in capturing the quasiparticle and satellite features of the electron gas. Our accurate calculations further allow us to address the long-standing debate over the occupied bandwidth of metallic sodium. Our findings indicate that the future application of coupled-cluster theory to condensed phase material spectra is highly promising.

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Experimental Band Structure of Na

Cited by 258 publications

References 18 publications

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

Nearly-free-electron system of monolayer Na on the surface of single-crystal HfSe2

One-electron excitations, correlation effects, and the plasmon in cesium metal

Spectral functions of the uniform electron gas via coupled-cluster theory and comparison to theGWand related approximations

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