Michael Widom

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Department of Physics, Carnegie Mellon University
Ph.D., Physics, University of Chicago, 1983
Summary:

Professor Widom's research focuses on theoretical modeling of novel materials in condensed matter and biological physics settings. Methods of statistical mechanics, quantum mechanics and computer simulation are used to investigate structure, stability and properties of these materials.

Metals in noncrystalline (nonperiodic) structures are a major focus of effort, including: Liquid metals, for example the liquid-liquid transition in supercooled silicon); Metallic glass es, which are multi-component alloys that freeze into a solid while maintaining a liquid-like structure; Quasicrystals, which are partially ordered and highly symmetric structures that are spatially quasiperiodic. These problems are addressed using first-principles total energy calculation coupled with statistical mechanics to model entire ensembles of probable structures.

Biological physics is the second major focus, including two specific projects. Virus capsids are highly symmetric protein shells that protect the viral genome. Methods of continuum mechanics and symmetry analysis are applied to identify soft modes of deformation. The RNA molecule plays many roles at the heart of gene expression, some of which such as microRNAs and riboswitches have only recently been discovered. A characteristic feature of RNA is its highly convoluted secondary structure, which are analyzed from both thermodynamic and kinetic points of view.

Most Cited Publications: 
  1. "Quasicrystal equilibrium state," Michael Widom, Katherine J. Strandburg, and Robert H. Swendsen, Phys. Rev. Lett. 58, 706 (1987)
  2. "Transfer-matrix analysis of a two-dimensional quasicrystal," M. Widom, D. P. Deng, and C. L. Henley, Phys. Rev. Lett. 63, 310 (1989)
  3. "Ductility improvement of amorphous steels: Roles of shear modulus and electronic structure," X.J. Gu, S. Joseph Poon, Gary J. Shiflet, Michael WidomActa Materialia 56, 88 (2008)
  4. "Symmetry, Landau theory and polytope models of glass," David R. Nelson, Michael Widom, Nuclear Physics B 240, 113 (1984) 
  5. "Radial fingering in a Hele-Shaw cell: a weakly nonlinear analysis," José A. Miranda, Michael WidomPhysica D: Nonlinear Phenomena 120, 315 (1998)
Recent Publications: 
  1. "First-principles prediction of high-entropy-alloy stability," R. Feng and P. K. Liaw, M. C. Gao, and M. WidomarXiv:1706.09282v1
  2. "A microscopic continuum model for defect dynamics in metallic glasses," Amit Acharya, Michael WidomJournal of the Mechanics and Physics of Solids 104, 1 (2017)
  3. "First-principles prediction of high-entropy-alloy stability," Rui Feng, Peter K. Liaw, Michael C. Gao, Michael WidomarXiv:1706.09282
  4. "Characterization of hexagonal boron nitride layers on nickel surfaces by low-energy electron microscopy," P. C. Mende, Q. Gao, A. Ismach, H. Chou, M. Widom, R. Ruoff, L. Colombo, R. M. Feenstra, Surface Science 659, 31 (2017)
  5. "Phase Diagram of Carbon Nickel Tungsten: Superatom Model," Sanxi Yao, Qin Gao, Michael WidomChristopher Marvel and Martin Harmer, arXiv:1705.06641v1
  6. "Comment on “New Ground-State Crystal Structure of Elemental Boron” Tadashi Ogitsu, Vincenzo Lordi, Eric Schwegler, and Michael Widom, Phys. Rev. Lett. 118, 159601 (2017)

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