Kukreja, Roopali - University of California, Davis - Department of Materials Science and Engineering

个人简介

B.Tech., 2008, Indian Institute of Technology Bombay, Dept. of Metallurgical Engineering and Materials Science M.S., 2011, Stanford University, Dept. of Materials Science and Engineering Ph.D., 2014, Stanford University, Dept. of Materials Science and Engineering Postdoctoral Research, U.C. San Diego, Center for Memory and Recording Research and Department of Physics

研究领域

Electronic and Magnetic materials are an active field of research due to their various applications ranging from memory and data storage to sensors and modulators. Manipulating phase transitions or magnetization using temperature, voltage, laser, strain forms the heart of these applications. We use X-ray techniques to image and understand the response of electronic and magnetic materials to the application of voltage, temperature and laser. Especially laser excitation allows us to reach femtosecond-nanosecond timescales, providing us with a unique method to image the phase transition or switching dynamics in these materials and manipulate physical properties on ultrafast timescales.

近期论文

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Photoinduced Enhancement of the Charge Density Wave Amplitude A. Singer, S. K. K. Patel, R. Kukreja, V. Uhlíř, J. Wingert, S. Festersen, D. Zhu, J. M. Glownia, H. T. Lemke, S. Nelson, M. Kozina, K. Rossnagel, M. Bauer, B. M. Murphy, O. M. Magnussen, E. E. Fullerton, and O. G. Shpyrko, Phys. Rev. Lett. 117, 056401 (2016) Phase separation in the nonequilibrium Verwey transition in magnetite F. Randi, I. Vergara, F. Novelli, M. Esposito, M. Dell’Angela, V. A. M. Brabers, P. Metcalf, R. Kukreja, H. A. Dürr, D. Fausti, M. Grüninger, and F. Parmigiani, Phys. Rev. B – Condens. Matter Mater. Phys. 93, 1 (2016) Correlation-Driven Insulator-Metal Transition in Near-Ideal Vanadium Dioxide Films A. X. Gray, J. Jeong, N. P. Aetukuri, P. Granitzka, Z. Chen, R. Kukreja, D. Higley, T. Chase, A. H. Reid, H. Ohldag, M. A. Marcus, A. Scholl, A. T. Young, A. Doran, C. A. Jenkins, P. Shafer, E. Arenholz, M. G. Samant, S. S. P. Parkin, and H. A. Dürr, Phys. Rev. Lett. 116, 116403 (2016) Generation mechanism of terahertz coherent acoustic phonons in Fe T. Henighan, M. Trigo, S. Bonetti, P. Granitzka, D. Higley, Z. Chen, M. P. Jiang, R. Kukreja, A. Gray, A. H. Reid, E. Jal, M. C. Hoffmann, M. Kozina, S. Song, M. Chollet, D. Zhu, P. F. Xu, J. Jeong, K. Carva, P. Maldonado, P. M. Oppeneer, M. G. Samant, S. S. P. Parkin, D. A. Reis, and H. A. Dürr, Phys. Rev. B 93, 220301 (2016) Direct observation and imaging of a spin-wave soliton with p-like symmetry S. Bonetti, R. Kukreja, Z. Chen, F. Macia, J. M. Hernandez, A. Eklund, D. Backes, J. Frisch, J. Katine, G. Malm, A. Kent, S. Urazhdin, J. Stöhr, H.Ohldag and H. Dürr, Nature Communications, 6, 8889 (2015) Microwave soft x-ray microscopy for nanoscale magnetization dynamics in the 5–10 GHz frequency range Stefano Bonetti, Roopali Kukreja, Zhao Chen, Detlef Spodding, Katharina Ollefs, Christian Schöppner, Ralf Meckenstock, Andreas Ney, Jude Pinto, Richard Houanche, Josef Frisch, Jöachim Stöhr, Herman Dürr and Hendrik Ohldag, Review of Scientific Instruments 86, 093703 (2015) Direct Observation of Large Amplitude Spin Excitations Localized in a Spin-Transfer Nanocontact D. Backes, F. Macia, S. Bonetti, R. Kukreja, H. Ohldag and A. D. Kent, Phy. Rev. Lett. 115, 128001 (2015) X-Ray Detection of Transient Magnetic Moments Induced by a Spin Current in Cu R. Kukreja, S. Bonetti, Z. Chen, D. Backes, Y. Acremann, J. A. Katine, A.D. Kent, H. A. Dürr, H. Ohldag, and J. Stöhr, Phy. Rev. Lett. 115, 096601 (2015) (Editor’s Suggestion) The role of space charge in photo-emission experiments A. Fognini, G. Salvatella, T. U. Michlmayr, C. Wetli, U. Ramsperger, T. Bähler, F. Sorgenfrei, M. Beye, a Eschenlohr, N. Pontius, C. Stamm, F. Hieke, M. Dell’Angela, S. de Jong, R. Kukreja, N. Gerasimova, V. Rybnikov, H. Redlin, J. Raabe, a Föhlisch, H. A. Dürr, W. Wurth, D. Pescia, a Vaterlaus, and Y. Acremann, New J. Phys. 16, 043031 (2014) Ultrafast reduction of the total magnetization in iron A. Fognini, T. U. Michlmayr, G. Salvatella, C. Wetli, U. Ramsperger, T. Bähler, F. Sorgenfrei, M. Beye, A. Eschenlohr, N. Pontius, C. Stamm, F. Hieke, M. Dell’Angela, S. de Jong, R. Kukreja, N. Gerasimova, V. Rybnikov, A. Al-Shemmary, H. Redlin, J. Raabe, A. Föhlisch, H. A. Dürr, W. Wurth, D. Pescia, A. Vaterlaus, and Y. Acremann, APL 104, 032402 (2014) Speed limit of the insulator-metal transition in magnetite S. de Jong*, R. Kukreja*, C. Trabant, N. Pontius, C.F. Chang, T. Kachel, M. Beye, F. Sorgenfrei, C. H. Back, B. Bräuer, W. F. Schlotter, J. J. Turner, O. Krupin, M. Doehler, D. Zhu, M. A. Hossain, A. O. Scherz, W. S. Lee, Y. D. Chuang, D. H. Lu, R. G. Moore, M. Yi, M. Trigo, P. Kirchmann, L. Pathey, M. S. Golden, M. Buchholz, P. Metcalf, W. Wurth, A. Föhlisch, C. Schüßler-Langeheine and H. A. Dürr, Nature Materials 12, 882 (2013) Control of the metal-insulator transition in vanadium dioxide by modifying orbital occupany N.B. Aetukuri, A.X. Gray, M. Drouard, M. Cossale, L.Gao, A.H. Reid, R. Kukreja, H. Ohldag, C.A. Jenkins, E. Arenholz, K.P. Roche, H.A Dürr, M.G. Samant and S.S.P. Parkin Nature Physics 9, 661 (2013) Femtosecond single-shot imaging of nanoscale ferromagnetic order in CoPd multilayers using resonant x-ray holography T. Wang, D. Zhu, B. Wu, C. Graves, S. Schaffert, T. Rander, L. Müller, B. Vodungbo, C. Baumier, D. Bernstein, B. Bräuer, V. Cros, S. de Jong, R. Delaunay, A. Fognini, R. Kukreja, S. Lee, V. López-Flores, J. Mohanty, B. Pfau, H. Popescu, M. Sacchi, A. B. Sardinha, F. Sirotti, P. Zeitoun, Messerschmidt, J. J. Turner, W. F. Schlotter, O. Hellwig, R. Mattana, N. Jaouen, F. Fortuna, Y. Acremann, C. Gutt, H. A. Dürr, E. Beaurepaire, C. Boeglin, S. Eisebitt, G. Grübel, J. Lüning, J. Stöhr, and A. O. Scherz, Physical Review Letters 108, 267403 (2012) Nonuniform switching of the perpendicular magnetization in a spin-torque-driven magnetic nanopillar David. P. Bernstein, Björn Bräuer, Roopali Kukreja, Joachim Stöhr, Thomas Hauet, Julien Cucchiara, Stéphane Mangin, Jordan A. Katine, Tolek Tyliszczak, Kang W. Chou and Yves Acremann, Phys. Rev. B 83, 180410(R) (2011) (Editors’ suggestion) Carrier mobility in pentacene as a function of grain size and orientation derived from scanning transmission X-ray microscopy Bjorn Bräuer, Roopali Kukreja, Ajay Virkar, Hylke B. Akkerman, Andreas Fognini, Tolek Tyliszczak, and Zhenan Bao, Organic. Electronics, 12, 1936 (2011) Solvent additives and their effects on blend morphologies of bulk heterojunctions Teddy Salim, Lydia Helena Wong, Björn Bräuer, Roopali Kukreja, Yong Lim Foo, Zhenan Bao and Yeng Ming Lam, Journal of Materials Chemistry 21, 242 (2010) X-ray Microscopy Imaging of the Grain Orientation in a Pentacene Field-Effect Transistor Björn Bräuer, Ajay Virkar, Stefan C. B. Mannsfeld, David P. Bernstein, Roopali Kukreja, Kang Wei Chou, Tolek Tyliszczak, Zhenan Bao, and Yves Acremann, Chemistry Materials 22, 3693 (2010)