个人简介

Ph.D., UC Berkeley, Berkeley, CA, 2003 Postdoctorate, Harvard University, Cambridge, MA and UCLA, Los Angeles, CA (2004-2008)

研究领域

Developing new theory and methodology for NMR and MRI; Nonlinear quantum mechanics; Spintronics.

For over sixty years, nuclear magnetic resonance (NMR) continues to be an active and fertile area of scientific research, with applications ranging from magnetic resonance imaging (MRI) to testing fundamental theories and applications of quantum mechanics. However, one of the main challenges in NMR over its history has been in increasing sensitivity and contrast/resolution in NMR and MRI. In order to address this challenge, the main focus of our group will be in designing new theoretical and experimental to improve contrast and sensitivity in NMR and MRI. In particular, we are developing new pulse sequences which can enhance the efficacy of existing contrast agents over a wide range of experimental conditions, which should lead to improved contrast. Besides developing methods for improving contrast, we are also interested in using NMR to test and to develop theories describing how quantum systems evolve under feedback in order to see, for instance, how classically chaotic behavior can emerge in quantum systems. The projects in our group will provide students with an excellent foundation in both quantum and statistical mechanics along with providing them a grounding in the principles of modern spectroscopy.

近期论文

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J.D. Walls, R.A. Harris, and C.J. Jameson, “Measuring chirality in NMR in the presence of a static electric field”, J. Chem. Phys. 128: 154502 (2008) J.D. Walls, “Parametric spin excitations in lateral quantum dots”, Phys. Rev. B 76: 195307 (2007) [selected for online publication in the Virtual Journal of Nanoscale Science and Technology, Nov. 26, 2007] J.D. Walls and E.J. Heller, “Spin-orbit induced interference in quantum corrals”Nano Letters 7: 3377-3382 (2007). J.D. Walls, S.Y. Huang, and Y.-Y. Lin “Spin amplification in solution magnetic resonance using radiation damping”, J. Chem. Phys. 127: 054507 (2007) [selected for online publication in the Virtual Journal of Biological Physics Research, Aug. 15, 2007] J.Y. Vaishnav, J.D. Walls, M. Apratim, and E.J. Heller, “Matter Wave Scattering and Guiding from Atomic Arrays”, Phys. Rev. A 76: 013620 (2007). J.D. Walls, S.Y. Huang, and Y.-Y. Lin, “Exciting Magnetization Using a Modulated Radiation Damping Field”, J. Phys. Chem. B 110: 19985-19989 (2006). J.D. Walls, J. Huang, R.M. Westervelt, and E.J. Heller, “Multiple Scattering Theory for Two-dimensional Electron Gases in the Presence of Spin-orbit Coupling”, Phys. Rev. B 73: 035325 (2006) P.G. Henry, M. Marjanska,, J.D. Walls, J. Valette, R. Gruetter, K. Ugurbil, “Proton-Observed Carbon-Edited NMR spectroscopy in strongly coupled systems”, Magn. Reson. Med. 55: 250-257 (2006) J.D. Walls and Y.-Y. Lin, “Constants of Motion in NMR Spectroscopy”, Solid State NMR 29: 22-29 (2006) R.H. Havlin, J.D. Walls and A. Pines, “Isotropic Proton-detected Local-Field Nuclear Magnetic Resonance in Solids”, J. Chem. Phys. 122: 074507 (2005) P. Fallahi, A.C. Bleszynski, R.M. Westervelt, J. Huang, J.D. Walls, E.J. Heller, M. Hanson, and A.C. Gossard, “Imaging a single-electron quantum dot”, Nano Letters5: 223-226 (2005). S.Y. Huang, C. Anklin, J.D. Walls, and Y.-Y. Lin, “Sizable Concentration-Dependent Frequency Shifts in Solution NMR Using Sensitive Probes”, J. Am. Chem. Soc. 126: 15936-15937 (2004). S.Y. Huang, J.D. Walls, Y. Wang, W.S. Warren, and Y.-Y. Lin, “Signal irreproducibility in high-field solution magnetic resonance experiments caused by spin turbulence”, J. Chem. Phys. 121: 6105-6109 (2004). J.D. Walls, F.P.K. Phoa, and Y.-Y. Lin, “Spin dynamics at very high spin polarization”, Phys. Rev. B 70: 174410 (2004).