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 and a Fellow of the American Physical Society. He was awarded the Harriett Sheridan for Distinguished Contribution to Teaching and Learning and the Philip J. Bray Award for Excellence in Science Teaching. As a Provost Faculty Teaching Fellow, he co-facilitates the Seminar for Transformation Around Anti-Racist Teaching that is offered through the Sheridan Center for Teaching and Learning.
| Zhang, Xue, Joy, James C, Zhao, Chenwei, Kim, Jin Ho, Fernandes, Gustavo, Xu, J M, Valles, James M. "Evaporating metal nanocrystal arrays." Nanotechnology, vol. 28, no. 10, 2017, pp. 105302. |
| Nguyen, H. Q., Hollen, S. M., Shainline, J., Xu, J. M., Valles, J. M. "Driving a Superconductor to Insulator Transition with Random Gauge Fields." Scientific Reports, vol. 6, 2016, pp. 38166. |
| Nguyen, H. Q., Hollen, S. M., Valles, J. M., Shainline, J., Xu, J. M. "Disorder influences the quantum critical transport at a superconductor-to-insulator transition." Physical Review B, vol. 92, no. 14, 2015. |
| Jung, Ilyong, Powers, Thomas R., Valles, James M. "Evidence for Two Extremes of Ciliary Motor Response in a Single Swimming Microorganism." Biophysical Journal, vol. 106, no. 1, 2014, pp. 106-113. |
| Hollen, S. M., Fernandes, G. E., Xu, J. M., Valles, J. M. "Fate of the Bose insulator in the limit of strong localization and low Cooper-pair density in ultrathin films." Physical Review B, vol. 90, no. 14, 2014. |
| Jung, Ilyong, Guevorkian, Karine, Valles, James M. "Trapping of Swimming Microorganisms at Lower Surfaces by Increasing Buoyancy." Phys. Rev. Lett., vol. 113, no. 21, 2014. |
| Hollen, S. M., Fernandes, G. E., Xu, J. M., Valles, J. M. "Collapse of the Cooper pair phase coherence length at a superconductor-to-insulator transition." Physical Review B, vol. 87, no. 5, 2013. |
| Hollen, S.M., Shainline, J., Xu, J.M., Valles, J.M. "Cooper pair insulator phase induced in amorphous Pb0.9Bi0.1 thin films." Physica C: Superconductivity, vol. 486, 2013, pp. 23-25. |
| Hollen, S M, Valles, J M. "Cooper pair islanding model of insulating nanohoneycomb films." J. Phys.: Conf. Ser., vol. 376, 2012, pp. 012002. |
| Hollen, S. M., Nguyen, H. Q., Rudisaile, E., Stewart, M. D., Shainline, J., Xu, J. M., Valles, J. M. "Cooper-pair insulator phase in superconducting amorphous Bi films induced by nanometer-scale thickness variations." Physical Review B, vol. 84, no. 6, 2011. |
| Stewart, M.D., Nguyen, H.Q., Hollen, S.M., Yin, Aijun, Xu, J.M., Valles, J.M. "Enhanced suppression of superconductivity in amorphous films with nano-scale patterning." Physica C: Superconductivity, vol. 469, no. 13, 2009, pp. 774-777. |
| Nguyen, H. Q., Hollen, S. M., Stewart, M. D., Shainline, J., Yin, Aijun, Xu, J. M., Valles, J. M. "Observation of Giant Positive Magnetoresistance in a Cooper Pair Insulator." Phys. Rev. Lett., vol. 103, no. 15, 2009. |
| Guo, Yongxing, Liu, Yifeng, Oldenbourg, Rudolf, Tang, Jay X., Valles, James M. "Effects of osmotic force and torque on microtubule bundling and pattern formation." Physical Review E, vol. 78, no. 4, 2008. |
| Stewart, M. D., Yin, Aijun, Xu, J. M., Valles, J. M. "Magnetic-field-tuned superconductor-to-insulator transitions in amorphous Bi films with nanoscale hexagonal arrays of holes." Physical Review B, vol. 77, no. 14, 2008. |
| Coleman, Chasity B., Allen, Patricia L., Valles, James M., Hammond, Timothy G. "Transcriptional regulation of changes in growth, cell cycle, and gene expression ofSaccharomyces cerevisiae due to changes in buoyancy." Biotechnology and Bioengineering, vol. 100, no. 2, 2008, pp. 334-343. |
| Coleman, Chasity B., Gonzalez-Villalobos, Romer A., Allen, Patricia L., Johanson, Kelly, Guevorkian, Karine, Valles, James M., Hammond, Timothy G. "Diamagnetic levitation changes growth, cell cycle, and gene expression ofSaccharomyces cerevisiae." Biotechnology and Bioengineering, vol. 98, no. 4, 2007, pp. 854-863. |
| Guo, Yongxing, Liu, Yifeng, Tang, Jay X., Valles, James M. "Polymerization Force Driven Buckling of Microtubule Bundles Determines the Wavelength of Patterns Formed in Tubulin Solutions." Phys. Rev. Lett., vol. 98, no. 19, 2007. |
| Stewart, M. D., Yin, A., Xu, J. M., Valles, J. M. "Superconducting Pair Correlations in an Amorphous Insulating Nanohoneycomb Film." Science, vol. 318, no. 5854, 2007, pp. 1273-1275. |
| Guevorkian, Karine, Valles, James M. "Aligning Paramecium caudatum with Static Magnetic Fields." Biophysical Journal, vol. 90, no. 8, 2006, pp. 3004-3011. |
| Stewart, M. D., Long, Zhenyi, Valles, James M., Yin, Aijun, Xu, J. M. "Magnetic-flux periodic response of nanoperforated ultrathin superconducting films." Physical Review B, vol. 73, no. 9, 2006. |
| Liu, Y., Guo, Y., Valles, J. M., Tang, J. X. "Microtubule bundling and nested buckling drive stripe formation in polymerizing tubulin solutions." Proceedings of the National Academy of Sciences, vol. 103, no. 28, 2006, pp. 10654-10659. |
| Barber, R. P., Hsu, Shih-Ying, Valles, J. M., Dynes, R. C., Glover, R. E. "Negative magnetoresistance, negative electroresistance, and metallic behavior on the insulating side of the two-dimensional superconductor-insulator transition in granular Pb films." Physical Review B, vol. 73, no. 13, 2006. |
| Long, Zhenyi, Stewart, M. D., Valles, James M. "Super-weakly coupled superconductivity in ultrathin superconductor–normal-metal bilayers." Physical Review B, vol. 73, no. 14, 2006. |
| Guevorkian, K., Valles, J. M. "Swimming Paramecium in magnetically simulated enhanced, reduced, and inverted gravity environments." Proceedings of the National Academy of Sciences, vol. 103, no. 35, 2006, pp. 13051-13056. |
| Long, Zhenyi, Valles, James M. "Early Stage Morphology of Quench Condensed Ag, Pb and Pb/Ag Hybrid Films." Journal of Low Temperature Physics, vol. 139, no. 3-4, 2005, pp. 429-438. |
| Guevorkian, Karine, Valles, James M. "In situ imaging of micro-organisms in intense magnetic fields." Review of Scientific Instruments, vol. 76, no. 10, 2005, pp. 103706. |
| Valles, J.M., Maris, H.J., Seidel, G.M., Tang, J., Yao, W. "Magnetic levitation-based Martian and Lunar gravity simulator." Advances in Space Research, vol. 36, no. 1, 2005, pp. 114-118. |
| VALLES, J.M., GUEVORKIAN, K. "MANIPULATING CELLS WITH STATIC MAGNETIC FIELDS." Materials Processing in Magnetic Fields, 2005. |
| Pavenayotin, Niravun, Stewart, M. D., Valles, James M., Yin, Aijun, Xu, J. M. "Spontaneous formation of ordered nanocrystal arrays in films evaporated onto nanopore array substrates." Appl. Phys. Lett., vol. 87, no. 19, 2005, pp. 193111. |
| Long, Zhenyi, Stewart, M. D., Kouh, Taejoon, Valles, James M. "Subgap Density of States in Superconductor-Normal Metal Bilayers in the Cooper Limit." Phys. Rev. Lett., vol. 93, no. 25, 2004. |
| Guevorkian, Karine, Valles, James M. "Varying the effective buoyancy of cells using magnetic force." Appl. Phys. Lett., vol. 84, no. 24, 2004, pp. 4863. |
| Year | Degree | Institution |
|---|---|---|
| 1988 | PhD | University of Massachusetts |
| 1981 | BA | Dartmouth College |
1981 Magna Cum Laude, Dartmouth College
1982-84 Graduate Fellow, University of Massachusetts
1986-87 IBM Graduate Fellow
1990-92 Alfred P. Sloan Fellow
1993 Elected to Sigma Xi
2012 Harriet W. Sheridan Award for Distinguished Contribution to Teaching and Learning
2013 Elected Fellow of the American Physical Society
2019 Philip J. Bray Award for Excellence in Science Teaching
2019 Excellent Research Award from The Magneto-Science Society of Japan
| PHYS 0040 - Basic Physics B |
| PHYS 0070 - Analytical Mechanics |
| PHYS 0470 - Electricity and Magnetism |
