High-resolution angle-resolved photoemission study of the Fermi surface and the normal-state electronic structure ofBi2Sr

Abstract

High-resolution angle-resolved photoelectron spectroscopic measurements were made of the Fermi edge of a single crystal of Bi2Sr2CaCu2O8 at 90 K along several directions in the Brillouin zone. The resultant Fermilevel crossings are consistent with local-density band calculations, including a point calculated to be of Bi-O character. Additional measurements were made where bands crossed the Fermi level between 100 and 250 K, along with measurements on an adjacent Pt foil. The Fermi edges of both materials agree to within the noise. Below the Fermi level the spectra show correlation effects in the form of an increased effective mass, but the essence of the single-particle band structure is retained. The shape of the spectra can be explained by a lifetime-broadened photohole and secondary electrons. The effective inverse photohole lifetime is linear in energy.

Electronic structure of cuprate superconductors in a full charge-spin recombination scheme

“…Later, the ARPES experimental studies show that in the underdoped and optimally doped regimes, although the antinodal region of the electron Fermi surface is gapped out, leading to the notion that only part of the electron Fermi surface survives as the disconnected Fermi arcs around the nodes [28][29][30][31][32] , the underlying electron Fermi surface determined from the low-energy spectral weight still fulfills Luttinger's theorem in the entire doping range 32 . These ARPES experimental facts [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30][31][32] on the other hand provide strong evidences supporting the notion of the charge-spin recombination 13,14 . Since the electron Fermi surface is a fundamental property of interacting electron systems, the study of the nature of the electron Fermi surface should be crucial for understanding the electronic structure of cuprate superconductors.…”

“…In particular, we find that within the framework of the standard d-wave BCS formalism in Eqs. (15) and (16), the electron Fermi surface in the entire doping range forms a continuous contour in momentum space [24][25][26][27] . Moreover, according to one of the self-consistent equations (20), the electron Fermi surface satisfies Luttinger's theorem, i.e., the electron Fermi surface area contains 1 − δ electrons.…”

“…Angle-resolved photoemission spectroscopy (ARPES) experiments reveal sharp spectral peaks in the singleparticle excitation spectrum 5,6,[15][16][17][18][19][20][21][22][23] , indicating the presence of quasiparticle-like states, which is also consistent with the long lifetime of the electronic state as it has been determined by the conductivity measurements 10,11 . In particular, as a direct method for probing the electron Fermi surface, the early ARPES measurements indicate that in the entire doping range, the underlying electron Fermi surface satisfies Luttinger's theorem [24][25][26][27] , i.e., the electron Fermi surface with the area is proportional to 1 − δ. Later, the ARPES experimental studies show that in the underdoped and optimally doped regimes, although the antinodal region of the electron Fermi surface is gapped out, leading to the notion that only part of the electron Fermi surface survives as the disconnected Fermi arcs around the nodes [28][29][30][31][32] , the underlying electron Fermi surface determined from the low-energy spectral weight still fulfills Luttinger's theorem in the entire doping range 32 .…”

Spectral properties of the planar t-J model

“…electrical conductivity scales with hole concentration, closer to the picture of holes moving in the antiferromagnetic (AFM) background. Moreover, in ARPES the FL interpretation is spoiled by the overdamped character of QP peaks [3,2]. Although a large background makes fits of particular lineshapes non-unique [3,4], the QP inverse lifetime is found to be of the order of the QP energy, i.e.…”

“…Moreover, in ARPES the FL interpretation is spoiled by the overdamped character of QP peaks [3,2]. Although a large background makes fits of particular lineshapes non-unique [3,4], the QP inverse lifetime is found to be of the order of the QP energy, i.e. τ −1 ∝ ω for ω > T , leading to the concept of the marginal Fermi liquid (MFL) [5] with an anomalous single-particle and transport relaxation, in contrast to τ −1 ∝ ω 2 in the normal FL.…”