Juan Carlos Campuzano

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Juan Carlos Campuzano is an experimental solid-state physicist from Paraguay who, among other things, deals with high-temperature superconductors (HTS) and phase transitions in two dimensions. He is a professor at the University of Illinois at Chicago (UIC).

Campuzano studied physics and applied mathematics at the University of Wisconsin-Milwaukee with a bachelor's degree in 1972, a master's degree in 1973 and a doctorate in physics in 1978. As a post-doctoral student he was at Donnan Laboratories at the University of Liverpool until 1981 . There he dealt with two-dimensional phase transitions and the development of photoelectron spectroscopy microscopy. 1981 to 1985 he was at the Cavendish Laboratory in Cambridge . From 1985 he was at the UIC and from 1987 he was also at the Argonne National Laboratory .

He examines HTS with photoelectron spectroscopy , in which the superconductors are irradiated with UV light ( ultraviolet photoelectron spectroscopy ) and the electrons released are analyzed. In doing so, he discovered the scaling of the Fermi surface volume as in Luttinger fluids in the normal state, flat energy bands, the momentum dependence of the energy gap to the superconducting state, spontaneous break of the time mirror symmetry in HTS, the existence of Fermi arcs and their scaling, a pseudo-gap in the energy spectrum of with Holes in undoped superconductors and the existence of an extended singularity in the energy spectrum.

In addition, he investigated two-dimensional phase transitions, which he examined, for example, with a high-resolution diffractometer for low-energy electrons developed in his laboratory. He was able to show, among other things, that scattering in such systems at a critical point (a phase transition) can be described by conformally invariant theories, regardless of the exact type of interaction.

In 2011, together with Zhi-Xun Shen and Peter Johnson, he received the Oliver E. Buckley Condensed Matter Prize for innovations in angle-resolved photoemission spectroscopy that advanced the understanding of high-temperature superconductors and transformed the study of strongly correlated electronic solid-state systems (laudation). He is a Fellow of the American Physical Society (2001).

Fonts

  • H. Ding, T. Yokoya, JC Campuzano, T. Takahashi, M. Randeria, MR Norman, T. Mochiku, K. Kadowaki, J. Giapintzakis: Spectroscopic evidence for a pseudogap in the normal state of underdoped high Tc superconductors, Nature , Volume 382, ​​1996, pp. 51-54.
  • MR Norman, H. Ding, JC Campuzano, T. Takeuchi, M. Randeria, T. Yokoya, T. Takahashi, T. Mochiku, K. Kadowaki: Unusual dispersion and line shape of the superconducting spectra of Bi2Sr2CaCu2O8 + d,, Phys . Rev. Letters, Volume 79, 1997, pp. 3506-3510.
  • M. Norman, H. Ding, M. Randeria, JC Campuzano, T. Yokoya, T. Takeuchi, T. Takahashi, T. Mochiku, K. Kadowaki, P. Guptasarma, DG Hinks: Destruction of the Fermi surface in underdoped high -Tc superconductors, Nature, Volume 392, 1998, p. 157.
  • MR Norman, M. Randeria, B. Janko B, JC Campuzano: Condensation energy and spectral functions in high-temperature superconductors, Phys Rev B, Volume 61, 2000, pp. 14742-14750.
  • A. Kaminski, S. Rosenkranz, HM Fretwell, JC Campuzano, Z. Li, H. Raffy, WG Cullen, H. You, CG Olson, CM Varma, H. Hochst: Spontaneous breaking of time-reversal symmetry in the pseudogap state of a high-Tc superconductor, Nature, Volume 416, 2002, pp. 610-613.
  • S. Souma, Y. Machida, T. Sato, T. Takahashi, H. Matsui, S.-C. Wang, H. Ding, A. Kaminski, JC Campuzano, S. Sasaki, K. Kadowaki: The origin of multiple superconducting gaps in MgB2,, Nature, Volume 423, 2003, pp. 65-67.
  • with A. Kanigel u. a .: Evolution of the pseudogap from Fermi arcs to the nodal liquid , Nature Physics, Volume 2, 2006, p. 447.
  • with A. Kanigel u. a .: Protected Nodes and the Collapse of Fermi Arcs in High-Tc Cuprate Superconductors , Phys. Rev. Lett., Vol. 99, 2007, p. 157001.
  • with M. Shi u. a .: Coherent d-Wave Superconducting Gap in Underdoped La2-xSrxCuO4 by Angle-Resolved Photoemission Spectroscopy , Phys. Rev. Lett., Volume 101, 2008, p. 047002.
  • with A. Kanigel u. a .: Evidence for pairing above the transition temperature of cuprate superconductors from the electronic dispersion in the pseudogap phase , Phys. Rev. Lett., Volume 101, 2008, p. 137002.
  • with U. Chatterjee u. a .: Observation of a d-wave nodal liquid in highly underdoped Bi2Sr2CaCu2O8 + δ , Nature Physics, Volume 6, 2010, p. 99.

Web links

Individual evidence

  1. ^ E. Buckley Prize 2014
personal data
SURNAME Campuzano, Juan Carlos
BRIEF DESCRIPTION Paraguayan physicist
DATE OF BIRTH 20th century