Lawrence Livermore National Laboratory

Andy McMahan

Ph.D. Theoretical Physics
University of Minnesota

Research Interests

Dynamical Mean Field Theory calculations of the properties of strongly correlated materials. Local-density predictions of the high pressure properties of solids, including phase transitions, as well the properties of novel energetic and cuprate materials. Tight-binding total energy representations.

Personal Background

Andy McMahan received his PhD in Theoretical Physics from the University of Minnesota in 1971, doing thesis work on exchange in quantum crystals. Following a year as Acting Assistant Professor at the University of Massachusetts, and two years as a Postdoctoral Associate at Cornell, he joined the Condensed Matter and Materials Division in the Physical and Life Sciences Directorate at LLNL in 1974, where he has been Physicist, Group Leader, Associate Division Leader, and currently Staff Scientist. He is a Fellow of the American Physical Society. His research interests at LLNL have focused on the electronic structure of solids, using local-density techniques to predict high pressure phase transitions and properties, and to explore novel energetic materials as well as the cuprate superconductors. His most recent work centers on finding realistic methods to treat strongly correlated materials such as the f-electron metals, and he is now using the merger of local-density and Dynamical Mean Field Theory in this effort.

Selected Publications

  1. "Cerium Volume Collapse: Results from the Merger of Dynamical Mean-Field Theory and Local Density Approximation," K. Held, A.K. McMahan, and R.T. Scalettar, Phys. Rev. Lett. 87, 276404 (2001).
  2. "Similarities between the Hubbard and Periodic Anderson Models at Finite Temperature," K. Held, C. Huscroft, R.T. Scalettar, and A.K. McMahan, Phys. Rev. Lett. 85, 373 (2000).
  3. "Magnetic and Thermodynamic Properties of the Three-Dimensional Periodic Anderson Hamiltonian," C. Huscroft, A.K. McMahan, and R.T. Scalettar, Phys. Rev. Lett. 82, 2342 (1999).
  4. "Volume-Collapse Transitions in the Rare Earth Metals," A.K. McMahan, C. Huscroft, R.T. Scalettar, and E.L. Pollock, J. Comput.-Aided Mater. Design 5, 131 (1998)
  5. "Polymeric Nitrogen," C. Mailhiot, L. H. Yang, and A. K. McMahan, Phys. Rev. B 46, 14419 (1993).
  6. "Calculated Effective Hamiltonian for La2CuO4 and Solution in the Impurity Anderson Approximation," A. K. McMahan, R. M. Martin, and S. Satpathy, Phys. Rev. B 38, 6650 (1988).
  7. "Pressure Dissociation of Solid Nitrogen Under 1 Mbar," A. K. McMahan and R. A. LeSar, Phys. Rev. Lett. 54, 1929 (1985).

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