James M. Valles, Jr.
Professor of Physics
Condensed Matter Experiment
Professor Valles joined the faculty at Brown in 1992. Prior to this he was an Assistant Professor of Physics at the University of Oregon from 1989 to 1992 and a postdoctoral member of the technical staff at AT&T Bell Laboratories from 1987 to 1989. He received his Ph.D. from the University of Massachusetts in 1988 and his Bachelor of Arts from Dartmouth College in 1981. He is the recipient of an Alfred P. Sloan Foundation Fellowship. 
RESEARCH INTERESTS: 
Condensed matter physics with emphasis on electron tunneling and transport studies of disordered metals and superconductors and high Tc superconductors. Biophysics concentrating on developing the use of large static magnetic fields as a tool for cell biology. Visit the Valles Lab page to learn more about current research.
SELECTED PUBLICATIONS:

“Magnetic Field Enhanced Order Parameter Amplitude Fluctuations in Ultrathin Films Near the Superconductor-Insulator Transition” (S.-Y. Hsu, J.A. Chervenak and J.M. Valles, Jr.) Phys. Rev. Lett. 75, 132 (1995).

“Magnetic field gradient levitation of Xenopus laevis: towards low gravity simulation” (J. M. Valles, Jr., K. Lin, J. M. Denegre, and K. L. Mowry) Biophys. J. 73, 1130 (1997).

“Cleavage Planes in Frog Eggs Altered by Strong Magnetic Fields” (J. M. Denegre, J.M., Valles, Jr., K. Lin, W. B. Jordan, and K. L. Mowry) Proc. Natl. Acad. Sci. USA 95, 14729 (1998).

“Morphology of Quench Condensed Pb Films near the Insulator to Metal Transition” (K. L. Ekinci and J. M. Valles, Jr.) Phys. Rev. Lett. 82, 1518 (1999). 

“Critical Amplitude Fluctuations in Low Superfluid Density Two Dimensional Superconductors” (J. A. Chervenak and J. M. Valles, Jr.) Phys. Rev. B 59, 11209 (1999).

“Absence of Vortex Solid Phase in Strongly Disordered Superconducting Bi Films” (J. A. Chervenak and J. M. Valles, Jr.) Phys. Rev. B 61, R9245 (2000).

“Model of Magnetic Field Induced Mitotic Apparatus Reorientation in Frog Eggs” (J. M. Valles, Jr.) (under revision) Biophys. J. 8/2001.

“Processes that Occur Before 2nd Cleavage Determine 3rd Cleavage Orientation in Xenopus” (J. M. Valles, Jr., S.R.R.M. Wasserman, C. Schweidenback, J. Edwardson, J. M. Denegre, and K. L. Mowry) (under revision) Expt. Cell Res. 8/2001.