RESEARCH INTERESTS

Experimental Condensed Matter

BIOGRAPHY
B.S., Physics (1972)
University of Wisconsin-Milwaukee
M.S., Physics (1973)
University of Wisconsin-Milwaukee
Ph.D., Physics(1978)
University of Wisconsin-Milwaukee

Professor Campuzano's research is in many areas of condensed matter physics, such as critical phenomena and two-dimensional phase transitions, the electronic structure of high temperature superconductors, and the development of techniques for studying empty electron energy levels in solids. A very-high-resolution low energy electron diffractometer was developed. This instrument has allowed him to confirm several predictions, such as the nature of the fluctuations in continuous two-dimensional phase transitions. More recently, he has shown that a newly discovered symmetry in nature, called conformal invariance, allows the calculation of the scattering behavior of particles from a material undergoing a phase transition without any knowledge of the details of the interaction. In the field of high temperature superconductivity, his group is determining the electronic structure of these exciting new compounds by photoemission spectroscopy, in which the sample is bombarded with ultraviolet light, releasing electrons that are analyzed to determine their original energy states in the sample. Major results from this work are the observation of a normal state with a Luttinger Fermi surface, flat bands in the dispersion, the momentum dependence of the superconducting gap, the pseudogap in the charge channel, the existance of Femi arcs, time reversal symmetry breaking, etc.

PUBLICATIONS

• Renormalization of spectral line shape and dispersion below Tc in Bi2Sr2CaCu2O8+d, 3, A. Kaminski, M. Randeria, J.C. Campuzano, M.R. Norman, H. Fretwell, J. Mesot, T. Sato, T. Takahashi, and K. Kadowaki. Phys. Rev. Lett. 86 (2001) 1070-107
• Temperature evolution of the spectral peak in high-temperature superconductors, , M. R. Norman, A. Kaminski, J. Mesot, and J.C. Campuzano.Phys. Rev. B. 63, (2001) 140508
• Summary of ARPES results on the pseudogap in Bi2Sr2CaCu2O8+d, in Open Problems in Strongly Correlated Electron Systems, J. Bonca, et al, eds., J.C. Campuzano and M. Randeria, Kluwer Academic Publishers, Amsterdam, 2001.
• Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-Tc superconductor, A. Kaminski, et al.Nature 416, 610-613 (2002)
• The origin of multiple superconducting gaps in MgB2S. Souma, Y. Machida, T. Sato, T. Takahashi, H. Matsui, S.-C. Wang, H. Ding, A. Kaminski, J. C. Campuzano, S. Sasaki, K. Kadowaki, Nature 423, 65-67 (01 May 2003)