个人简介

Marie Curie Fellow (2011 – 2014) Paul Scherrer Institute (PSI), Villigen, Switzerland FEMTO Group – Swiss Light Source Group Leader: Gerhard Ingold Ph.D. Physical Chemistry (2006-2011) Massachusetts Institute of Technology (MIT) – Cambridge, MA Advisor: Keith Nelson B.S. Chemistry Brigham Young University (BYU) – Provo, UT (2006)

研究领域

Physical Chemistry

In the Johnson Spectroscopy Laboratory we 1) Create new ultrafast spectroscopy tools to enable the study and control of material properties 2) Use those tools to investigate properties of new and interesting materials

近期论文

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T. Kubacka, J. A. Johnson, M. C. Hoffmann, C. Vicario, S. de Jong, P. Beaud, S. Grübel, S-W. Huang, L. Huber, L. Patthey, Y-D Chuang, J. J. Turner, G. Dakovski, W-S. Lee, W. Schlotter, R. G. Moore, C. Hauri, S. M. Koohpayeh, V. Scagnoli, G. Ingold, S. L. Johnson, U. Staub, Direct view of spin dynamics in a large magnitude coherent eletromagnon, Science 343, 1333 (2014). F. D. J. Brunner, J. A. Johnson, S. Grübel, A. Ferrer, S. L. Johnson, T. Feurer, Distortion-free enhancement of terahertz signals measured by electro-optic sampling. I. Theory, J. Opt. Soc. Am. B 31, 904 (2014). J. A. Johnson, F. D. J. Brunner, S. Grübel, A. Ferrer, S. L. Johnson, T. Feurer, Distortion-free enhancement of terahertz signals measured by electro-optic sampling. II. Experiment, J. Opt. Soc. Am. B 31, 1035 (2014). P. Beaud, A. Caviezel, S. O. Mariager, L. Rettig, G. Ingold, C. Dornes, S-W. Huang, J. A. Johnson, M. Radovic, T. Huber, T. Kubacka, A. Ferrer, H. T. Lemke, M. Chollet, D. Zhu, J. M. Glownia, M. Sikorski, A. Robert, H. Wadati, M. Nakamura, M. Kawasaki, Y. Tokura, S. L. Johnson, U. Staub. A time-dependent order parameter for ultrafast photoinduced phase transitions. Nat. Mater. 13, 923 (2014). S. O. Mariager, C. Dornes, J. A. Johnson, A. Ferrer, S. Grübel, T. Huber, A. Caviezel, S. L. Johnson, T. Eichhorn, G. Jakob, H. J. Elmers, P. Beaud, C. Quitmann, G. Ingold. Structural and magnetic dynamics in the magnetic shape-memory alloy Ni2MnGa, Phys. Rev. B 90, 161103(R) (2014). T. Huber, S. O. Mariager, A. Ferrer, H. Schäfer, J. A. Johnson, S. Grübel, A. Lübcke, L. Huber, T. Kubacka, C. Dornes, C. Laulhe, S. Ravy, G. Ingold, P. Beaud, J. Demsar, S. L. Johnson. Coherent Stuctural Dynamics of a Prototypical Charge-Density-Wave-to-Metal Transition. Phys. Rev. Lett. 113, 026401 (2014). J. A. Johnson, A. A. Maznev, J. Cuffe, J. K. Eliason, A. J. Minnich, T. Kehoe, C. M. Sotomayor Torres, G. Chen, K. A. Nelson, Direct Measurement of Room-Temperature Nondiffusive Thermal Transport Over Micron Distances in a Silicon Membrane, Phys. Rev. Lett. 110, 025901 (2013). M. Luckyanova, J. A. Johnson, A. A. Maznev, J. Garg, A. Jandl, M. T. Bulsara, E. A. Fitzgerald, K. A. Nelson, G. Chen, Anisotropy of the thermal conductivity in GaAs/AlAs superlattices. Nano Lett. 13, 3973 (2013). D. H. Torchinsky, J. A. Johnson, K. A. Nelson, a-Scale decoupling of the mechanical relaxation and diverging shear wave propagation length scale in triphenylphosphite, J. Chem. Phys. 136, 174509 (2012). J. A. Johnson, A. A. Maznev, M. T. Bulsara, E. A. Fitzgerald, T. C. Harman, S. Calawa, C. J. Vineis, G. Turner, K. A. Nelson, Phase-controlled, heterodyne laser-induced transient grating measurements of thermal transport properties in opaque material, J. Appl. Phys. 111, 023503 (2012). A. J. Minnich, J. A. Johnson, A. J. Schmidt, K. Esfarjani, M. S. Dresselhaus, K. A. Nelson, G. Chen, Thermal Conductivity Spectroscopy Technique to Measure Phonon Mean Free Paths, Phys. Rev. Lett. 107, 095901 (2011). J. A. Johnson, K. J. Manke, D. G. Veyssett, A. A. Maznev, K. J. Ramos, D. E. Hooks, K. A. Nelson, Photoacoustic determination of the speed of sound in single crystal cyclotrimethylene trinitramine at acoustic frequencies from 0.5 to 15 GHz, J. Appl. Phys. 110, 113513 (2011). A. Maznev, J. A. Johnson, K. A. Nelson, Onset of nondiffusive phonon transport in transient thermal grating decay, Phys. Rev B 84, 195206 (2011). A. Maznev, J. A. Johnson, K. A. Nelson, Non-equilibrium transient thermal grating relaxation in metal, J. Appl. Phys. 109, 073517 (2011). D. H. Torchinsky, J. A. Johnson, K. A. Nelson, A direct test of the correlation between elastic parameters and fragility of ten glass formers and their relationship to elastic models of the glass transition, J. Chem. Phys. 130, 064502-1-11, (2009). J. Schmidt, M. Chiesa, D. H. Torchinsky, J. A. Johnson, A. Boustani, G. H. McKinley, K. A. Nelson, G. Chen. Experimental investigation of nanofluid shear and longitudinal viscosities. Appl. Phys. Lett. 92, 244207-1-3, (2008). J. Schmidt, M. Chiesa, D. H. Torchinsky, J. A. Johnson, K. A. Nelson, G. Chen. Thermal conductivity of nanoparticle suspensions in insulating media measured with a transient optical grating and a hotwire. J. Appl. Phys. 103, 083529-1-5, (2008). J. A. Johnson, A. M. Duffin, B. J. Hom, K. E. Jackson, E. T. Sevy. Quenching of highly vibrationally excited pyrimidine by collisions with CO2. J. Chem. Phys. 128, 054304-1-14, (2008). J. A. Johnson, K. Kim, M. Mayhew, D. G. Mitchell, E. T. Sevy. Rotationally resolved IR-diode laser studies of ground-state CO2 Excited by collisions with vibrationally excited pyridine. J. Phys. Chem. A 112, 2543-2552, (2008). D. G. Mitchell, A. M. Johnson, J. A. Johnson, K. A. Judd, K. Kim, M. Mayhew, A. L. Powell, E. T. Sevy. Collisional Relaxation of the Three Vibrationally Excited Difluorobenzene Isomers by Collisions with CO2: Effect of Donor Vibrational Mode. J. Phys. Chem. A 112, 1157 (2008).