Publications

Ultrafast terahertz field control of electronic and structural interactions in vanadium dioxide A. X. Gray, M. C. Hoffmann, J. Jeong, N. P. Aetukuri, D. Zhu, H. Y. Hwang, N. C. Brandt, H. Wen, A. J. Sternbach, S. Bonetti, A. H. Reid, R. Kukreja, C. Graves, T. Wang, P. Granitzka, Z. Chen, D. J. Higley, T. Chase, E. Jal, E. Abreu, M. K. Liu, T.-C. Weng, D. Sokaras, D. Nordlund, M. Chollet, R. Alonso-Mori, H. Lemke, J. M. Glownia, M. Trigo, Y. Zhu, H. Ohldag, J. W. Freeland, M. G. Samant, J. Berakdar, R. D. Averitt, K. A. Nelson, S. S. P. Parkin, and H. A. Dürr, Phys. Rev. B 98, 045104 (2018)

Nonequilibrium Phase Precursors during a Photoexcited Insulator-to-Metal Transition in V2O3 A. Singer, Juan Gabriel Ramirez, Ilya Valmianski, Devin Cela, Nelson Hua, Roopali Kukreja, James Wingert, Olesya Kovalchuk, James M. Glownia, Marcin Sikorski, Matthieu Chollet, Martin Holt, Ivan K. Schuller and Oleg G. Shpyrko, Phys. Rev. Lett. 120, 207601 (2018).

Phase coexistence and pinning of charge density waves by interfaces in chromium Singer, S. K. K. Patel, V. Uhlır, R. Kukreja, A. Ulvestad, E. M. Dufresne, A. R. Sandy, E. E. Fullerton, and O. G. Shpyrko, Phys. Rev. B – Condens. Matter Mater. Phys. 94, 1–5 (2016).

 Measurement of collective excitations in VO2 by resonant inelastic x-ray scattering Haowei He A. X. Gray, P. Granitzka, J.W. Jeong, N. P. Aetukuri, R. Kukreja, Lin Miao, S. Alexander Breitweiser, Jinpeng Wu, Y. B. Huang, P. Olalde-Velasco, J. Pelliciari, W. F. Schlotter, E. Arenholz, T. Schmitt, M. G. Samant, S. S. P. Parkin, H. A. Durr, and L. Andrew Wray, Phys. Rev. B 94, 161119 (2016).

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)

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)

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)

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)

 

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