PT  - JOURNAL ARTICLE
AU  - Hoffman, J. E.
AU  - McElroy, K.
AU  - Lee, D.-H.
AU  - Lang, K. M
AU  - Eisaki, H.
AU  - Uchida, S.
AU  - Davis, J. C.
TI  - Imaging Quasiparticle Interference in Bi<sub>2</sub>Sr<sub>2</sub>CaCu<sub>2</sub>O<sub>8+δ</sub>
AID  - 10.1126/science.1072640
DP  - 2002 Aug 16
TA  - Science
PG  - 1148--1151
VI  - 297
IP  - 5584
4099  - http://science.sciencemag.org/content/297/5584/1148.short
4100  - http://science.sciencemag.org/content/297/5584/1148.full
SO  - Science2002 Aug 16; 297
AB  - Scanning tunneling spectroscopy of the high-T c superconductor Bi2Sr2CaCu2O8+δreveals weak, incommensurate, spatial modulations in the tunneling conductance. Images of these energy-dependent modulations are Fourier analyzed to yield the dispersion of their wavevectors. Comparison of the dispersions with photoemission spectroscopy data indicates that quasiparticle interference, due to elastic scattering between characteristic regions of momentum-space, provides a consistent explanation for the conductance modulations, without appeal to another order parameter. These results refocus attention on quasiparticle scattering processes as potential explanations for other incommensurate phenomena in the cuprates. The momentum-resolved tunneling spectroscopy demonstrated here also provides a new technique with which to study quasiparticles in correlated materials.