# Robert Brown

### **Lecturer of Physics**

### Overview

Prof. Robert G. Brown is interested in using algebraic and statistical methods to study a wide range of equilibrium and nonequilibrium problems. With collaborator Dr. Mikael Ciftan, Dr. Brown has developed new Monte Carlo Langevin equation-based techniques that allow dynamic/nonequilibrium and static/equilibrium phenomena to be studied on the same footing. His recent work includes algebraic and computational studies in dynamic and static critical phenomena in quantum optics and magnetism. In earlier work, Dr. Brown also developed a generalized (non-muffin-tin) stationary multiple scattering theory including applications to band theory and quantum chemistry. This work formally eliminates the muffin-tin approximation from KKR-type band theory and its equivalents in quantum chemistry, without the need for so-called "near field" corrections.

Brown, R. G., and M. Ciftan. “Comment on "Energy-band equation for a general periodic potential".” *Physical Review. B, Condensed Matter*, vol. 39, no. 14, May 1989, pp. 10415–19. *Epmc*, doi:10.1103/physrevb.39.10415.
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Brown, R. G., and M. Ciftan. “Multipolar expansions for the empty-lattice problem.” *Physical Review. B, Condensed Matter*, vol. 39, no. 6, Feb. 1989, pp. 3543–50. *Epmc*, doi:10.1103/physrevb.39.3543.
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Brown, R. G. “Generalised non-muffin-tin multiple scattering theory.” *Journal of Physics B: Atomic, Molecular and Optical Physics*, vol. 21, no. 11, Dec. 1988. *Scopus*, doi:10.1088/0953-4075/21/11/008.
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Brown, R. G., and M. Ciftan. “Numerical tests of high-precision multiple-scattering band theory.” *Physical Review. B, Condensed Matter*, vol. 33, no. 12, June 1986, pp. 7937–40. *Epmc*, doi:10.1103/physrevb.33.7937.
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Brown, R. G., and M. Ciftan. “Response to "non-muffin-tin band theories of the multiple-scattering type".” *Physical Review. B, Condensed Matter*, vol. 32, no. 2, July 1985, pp. 1343–46. *Epmc*, doi:10.1103/physrevb.32.1343.
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Brown, R. G., and M. Ciftan. “A generalized non‐muffin‐tin theory of band structure.” *International Journal of Quantum Chemistry*, vol. 27, no. 6, Jan. 1985, pp. 803–04. *Scopus*, doi:10.1002/qua.560270614.
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Brown, R. G., and M. Ciftan. “Erratum: A generalized non‐muffin‐tin theory of band structure.” *International Journal of Quantum Chemistry*, vol. 28, no. 19 S, Jan. 1985, pp. 751–52. *Scopus*, doi:10.1002/qua.560280874.
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Brown, R. G., and M. Ciftan. “A generalized non‐muffin‐tin theory of band structure.” *International Journal of Quantum Chemistry*, vol. 26, no. 18 S, Jan. 1984, pp. 87–104. *Scopus*, doi:10.1002/qua.560260813.
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Brown, R. G., and M. Ciftan. “Generalized non-muffin-tin band theory.” *Physical Review B*, vol. 27, no. 8, Jan. 1983, pp. 4564–79. *Scopus*, doi:10.1103/PhysRevB.27.4564.
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Ciftan, M., et al. “Stress activated Raman scattering and microcrack detection.” *International Journal of Engineering Science*, vol. 21, no. 11, Jan. 1983, pp. 1285–93. *Scopus*, doi:10.1016/0020-7225(83)90125-8.
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