What’s New
  • Our paper on "Chiral density wave of the hidden order phase in URu2Si2" accepted in Science. Authors:H.-H. Kung, R. E. Baumbach, E. D. Bauer, V. K. Thorsmølle, W.-L. Zhang, K. Haule, J. A. Mydosh and G. Blumberg.
  • Our paper on "Effects of electron correlations on transport properties of iron at Earth’s core conditions" accepted in Nature, Authors: P. Zhang, R. E. Cohen, and K. Haule.
  • Awarded Blawatnik Award 2013 Blavatnik Honorees, facebook
  • Awarded Alfred P. Sloan Fellowship 2008, news report, more news
  • Awarded NSF Career Award 2008, news report
  • Awarded a Board of Trustees Research Award for Scholarly Excellence, Rutgers University, April 2009 report.

  • physworld sci-fig1
    In this Science report we address the fundamental question of crossover from localized to itinerant state of a paradigmatic heavy fermion material CeIrIn5. The temperature evolution of the one electron spectra and the optical conductivity is predicted from first principles calculation. The buildup of coherence in the form of a dispersive many body feature is followed in detail and its effects on the conduction electrons of the material is revealed. We find multiple hybridization gaps and link them to the crystal structure of the material. Our theoretical approach explains the multiple peak structures observed in optical experiments and the sensitivity of CeIrIn5 to substitutions of the transition metal element and may provide a microscopic basis for the more phenomenological descriptions currently used to interpret experiments in heavy fermion systems.  

    Online article coverage:
    Science 318, 1618 (2007); 10.1126/science.1149064 (Science Express Reports) (November 1 2007)
        Perspective , Report
    In this Nature letter, we explain the unique nature of plutonium delta phase, namely its mixed valence nature, and contrast it to curium metallic phase where f electrons are localized and order antiferromagneticaly at low temperature. Curium follows americium in periodic table and is thus kind of analog of plutonium: plutonium has one hole in americium inert f-shell (J=0) while curium has one more electron in the americium inert shell. The striking different properties of the two elements (one mixed valent non magnetic and other magnetic with Tc=65K) was hard to understand with any band structure method. We developed accurate Dynamical Mean-Field Method in combination with LDA and showed that it describes from first principles the peculiarities of the two materials. This method is the first that described magnetism at finite temperature from first principles and show that plutonium is non-magnetic while curium orders below 100K. This method holds a great promise that it could predict magnetism from first principles.  
    Online article coverage:
    Nature 446, 513-516 (29 March 2007)
    Kristjan Haule, Professor of Physics
    Department of Physics and Astronomy
    Serin Physics Lab
    Office 267
    Rutgers University
    136 Frelinghuysen Road
    Piscataway, NJ 08854-8019
    Tel: 732.445.3881
    FAX: 732.445.4343