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【期刊论文】Electronic excitations near the Brillouin zone boundary of Bi2Sr2CaCu2O8+δ
封东来, D.
PHYSICAL REVIEW B, VOLUME 65, 220501 ,-0001,():
-1年11月30日
Based on angle resolved photoemission spectra measured on different systems at different dopings, momenta, and photon energies, we show that the anomalously large spectral linewidth in the (p,0) region of optimal doped and underdoped Bi2Sr2CaCu2O8+δ has significant contributions from the bilayer band splitting, and that the scattering rate in this region is considerably smaller than previously estimated. This picture of the electronic excitation near (p,0) puts additional experimental constraints on various microscopic theories and data analyses.
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封东来, D.
PHYSICAL REVIEW LETTERS VOLUME 88, NUMBER 10, 11 MARCH 2002,-0001,():
-1年11月30日
The low-energy electronic structure of the nearly optimally doped trilayer cuprate superconductor Bi2Sr2Ca2Cu3O10+δ is investigated by angle-resolved photoemission spectroscopy. The normal state quasiparticle dispersion and Fermi surface and the superconducting d-wave gap and coherence peak are observed and compared with those of single- and bilayer systems. We find that both the superconducting gap magnitude and the relative coherence-peak intensity scale linearly with Tc for various optimally doped materials.
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封东来, B.
PHYSICAL REVIEW LETTERS PRL 98, 147001 (2007) 6 APRIL 2007,-0001,():
-1年11月30日
In the present photoemission study of a cuprate superconductor Bi1.74Pb0.38Sr1.88CuO6+δ, we discovered a large scale dispersion of the lowest band, which unexpectedly follows the band structure calculation very well. Similar behavior observed in blue bronze and the Mott insulator Ca2CuO2Cl2 suggests that the origin of hopping-dominated dispersion in an overdoped cuprate might be quite complicated. A giant kink in the dispersion is observed, and the complete self-energy containing all interaction information is extracted for a doped cuprate. These results recovered significant missing pieces in our current understanding of the electronic structure of cuprates.
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封东来, K.
PHYSICAL REVIEW LETTERS PRL 98, 036404 (2007) 19 JANUARY 2007,-0001,():
-1年11月30日
Excitons
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封东来, D.L.
Journal of Physics and Chemistry of Solids 67 (2006) 198-200,-0001,():
-1年11月30日
We discuss the puzzles surrounding the interpretation of the 1/8 anomaly in cuprates, highlighting the tension between the real and reciprocal space ways to look at the problem. This issue is relevant to the current discussion on the nature of charge ordering in the form of ‘stripe' and ‘checker-board' as derived from neutron and STM experiments. A resolution of this tension is important to fully understand the electronic structure.
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