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Register a new userLuttinger liquid phenomenology and angle resolved photoemission for single layer $chem{Bi_2Sr_{2-x}La_xCuO_{6+delta}}$ high--temperature superconductor
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Recently observed splitting in angular resolved photoemission spectroscopy (ARPES) on $chem{Bi_2Sr_{2-x}La_xCuO_{6+delta}}$ high--temperature superconductor (Janowitz C. {it et al.}, {it Europhys. Lett.}, {bf 60} (2002) 615) is interpreted within the phenomenological Luttinger--liquid framework, in which both the non--Fermi liquid scaling exponent of the spectral function and the spin--charge separation are introduced. The anomalous Green function with adjustable parameters fits very well to the Fermi edge and the low--energy part of ARPES along the $Gamma-M$ line in the Brillouin zone. In contrast to one--dimensional models with Luttinger--liquid behavior we find that both the anomalous scaling $alpha$ and the parameter $delta$ describing the spin--charge separation are momentum dependent. The higher--energy part of the spectra is not accounted for by this simple Luttinger--liquid form of the Green function. In this energy regime additional scattering processes are plausible to produce the experimentally observed wide incoherent background, which diminishes as the inverse of the energy.
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A first Fermi surface map of a single-layer high-Tc superconductor is presented. The experiments were carried out on optimally doped Bi_2Sr_(2-x)La_xCuO_(6+delta)(x=0.40) with synchrotron radiation which allow to discuss in detail the strong polarisation dependence of the emissions near the Fermi edge. For the cuprates only little is known about the impact of the electron-photon matrix element determining the photoelectron intensity. For the example of the model layered superconductor Bi_2Sr_(2-x)La_xCuO_(6+delta)it will be demonstrated that the polarization geometry has significant influence on the energy distribution curves at EF and consequently also for the determination of the topology and character of the Fermi surface (FS) by angle-resolved photoemission. For further clarification also a FS map of the n=2 material Bi-2212 has been measured applying a different polarisation geometry as previously used by Saini et al.. In the context of the current debate on the character of the Fermi surface of Bi-cuprates our results confirm a hole-like Fermi surface for n=1 as well as n=2 material, what might be the universal FS for high-Tc superconductors.
Reply to comment by Zhou et al. (arXiv:1012.3602) on arXiv:1012.1484 / Phys. Rev. Lett. 106, 127005 (2011).
A recent letter by Xue et al. (PRL v.83, 1235 (99)) reports a Fermi-Liquid (FL) angle resolved photoemission (ARPES) lineshape for quasi one-dimensional Li0.9Mo6O17, contradicting our report (PRL v.82, 2540 (99)) of a non-FL lineshape in this material. Xue et al. attributed the difference to the improved angle resolution. In this comment, we point out that this reasoning is flawed. Rather, we find that their data have fundamental differences from other ARPES results and also band theory.
Super-high resolution laser-based angle-resolved photoemission (ARPES) measurements have been carried out on the high energy electron dynamics in Bi2Sr2CaCu2O8 (Bi2212) high temperature superconductor. Momentum dependent measurements provide new insights on the nature of high energy kink at 200~400 meV and high energy dispersions. The strong dichotomy between the MDC- and EDC-derived bands is revealed which raises critical issues about its origin and which one represents intrinsic band structure. The MDC-derived high energy features are affected by the high-intensity valence band at higher binding energy and may not be intrinsic.
We have developed the numerical software package $chinook$, designed for the simulation of photoemission matrix elements. This quantity encodes a depth of information regarding the orbital structure of the underlying wavefunctions from which photoemission occurs. Extraction of this information is often nontrivial, owing to the influence of the experimental geometry and photoelectron interference, precluding straightforward solutions. The $chinook$ code has been designed to simulate and predict the ARPES intensity measured for arbitrary experimental configuration, including photon-energy, polarization and spin-projection, as well as consideration of both surface-projected slab and bulk models. This framework then facilitates an efficient interpretation of the photoemission experiment, allowing for a deeper understanding of the electronic structure in addition to the design of new experiments which leverage the matrix element effects towards the objective of selective photoemission from states of particular interest.
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