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Alexander GrayKey PublicationsOrigins and THz E-field control of emergent interfacial ferromagnetism |
Three key papers (click on the titles to open)
1. Depth-resolved charge reconstruction at the LaNiO3/CaMnO3 interface,
R. U. Chandrasena, C. L. Flint, W. Yang, A. Arab, S. Nemšák, M. Gehlmann, V. B. Özdöl, F. Bisti, K. D. Wijesekara, J. Meyer-Ilse, E. Gullikson, E. Arenholz, J. Ciston, C. M. Schneider, V. N. Strocov, Y. Suzuki, and A. X. Gray, Phys. Rev. B 98, 155103 (2018).
In this paper, we used soft x-ray standing-wave photoemission spectroscopy to investigate the origins of the emergent ferromagnetism at the interface between CaMnO3 and LaNiO3. One of the first goals of the proposed project will be to determine whether this interfacial magnetic state could be controlled/switched using ultrafast THz E-field pulses. Our preliminary measurements using table-top THz-pump tr-MOKE and IR spectroscopies show promising results.
R. U. Chandrasena, C. L. Flint, W. Yang, A. Arab, S. Nemšák, M. Gehlmann, V. B. Özdöl, F. Bisti, K. D. Wijesekara, J. Meyer-Ilse, E. Gullikson, E. Arenholz, J. Ciston, C. M. Schneider, V. N. Strocov, Y. Suzuki, and A. X. Gray, Phys. Rev. B 98, 155103 (2018).
In this paper, we used soft x-ray standing-wave photoemission spectroscopy to investigate the origins of the emergent ferromagnetism at the interface between CaMnO3 and LaNiO3. One of the first goals of the proposed project will be to determine whether this interfacial magnetic state could be controlled/switched using ultrafast THz E-field pulses. Our preliminary measurements using table-top THz-pump tr-MOKE and IR spectroscopies show promising results.
2. Ultrafast THz Field Control of Electronic and Structural Interactions in Vanadium Dioxide,
A. X. Gray, M. C. Hoffmann, J. Jeong, N. P. Aetukuri, H. Wen, D. Zhu, H. Y. Hwang, N. C. Brandt, S. Bonetti, R. Kukreja, C. Graves, A. H. M. Reid, P. Granitzka, Z. Chen, T.-C. Weng, D. Nordlund, D. Sokaras, R. Alonso-Mori, A. Sternbach, E. Abreu, M. Chollet, J. Glownia, B. Schlotter, M. Hantschman, Y. Zhu, M. Trigo, H. Ohldag, J. Stöhr, M. Samant, J. Freeland, R. Averitt, K. A. Nelson, S. S. P. Parkin, H. A. Dürr, Phys. Rev. B 98, 045104 (2018).
In this paper, we used a combination of ultrafast THz, optical, and x-ray scattering techniques to trigger and probe the metal-insulator transition in another prototypical Mott oxide - VO2. This was the first such study carried out at LCLS. For the proposed project, we plan to marry this technique with standing-wave spectroscopy for depth-resolved studies of interfacial phenomena.
A. X. Gray, M. C. Hoffmann, J. Jeong, N. P. Aetukuri, H. Wen, D. Zhu, H. Y. Hwang, N. C. Brandt, S. Bonetti, R. Kukreja, C. Graves, A. H. M. Reid, P. Granitzka, Z. Chen, T.-C. Weng, D. Nordlund, D. Sokaras, R. Alonso-Mori, A. Sternbach, E. Abreu, M. Chollet, J. Glownia, B. Schlotter, M. Hantschman, Y. Zhu, M. Trigo, H. Ohldag, J. Stöhr, M. Samant, J. Freeland, R. Averitt, K. A. Nelson, S. S. P. Parkin, H. A. Dürr, Phys. Rev. B 98, 045104 (2018).
In this paper, we used a combination of ultrafast THz, optical, and x-ray scattering techniques to trigger and probe the metal-insulator transition in another prototypical Mott oxide - VO2. This was the first such study carried out at LCLS. For the proposed project, we plan to marry this technique with standing-wave spectroscopy for depth-resolved studies of interfacial phenomena.
3. Emergent phenomena at oxide interfaces studied with standing-wave photoelectron spectroscopy,
C.-T. Kuo, G. Conti, J. E. Rault, C. M. Schneider, S. Nemšák, and A. X. Gray, J. Vac. Sci. Technol. A 40, 020801 (2022).
This is a recent review paper I wrote with my collaborators on the standing-wave spectroscopy of oxide interfaces.
C.-T. Kuo, G. Conti, J. E. Rault, C. M. Schneider, S. Nemšák, and A. X. Gray, J. Vac. Sci. Technol. A 40, 020801 (2022).
This is a recent review paper I wrote with my collaborators on the standing-wave spectroscopy of oxide interfaces.
Highlights of our work in x-ray standing-wave spectroscopy
W. Yang et al., Phys. Rev. B 100, 125119 (2019).
S. Nemšák et al., Phys. Rev. B 93, 245103 (2016).
A. X. Gray, J. Electron Spectrosc. Relat. Phenom. 195, 399 (2014).
A. X. Gray et al., Europhys. Lett. 104, 17004 (2013).
S.-H. Yang, AXG et al., J. Appl. Phys. 113, 073513 (2013).
A. A. Greer, AXG et al., Appl. Phys. Lett. 101, 202402 (2012).
A. X. Gray et al., Phys. Rev. B 82, 205116 (2010).
A. X. Gray et al., Appl. Phys. Lett. 97, 062503 (2010).
S. Nemšák et al., Phys. Rev. B 93, 245103 (2016).
A. X. Gray, J. Electron Spectrosc. Relat. Phenom. 195, 399 (2014).
A. X. Gray et al., Europhys. Lett. 104, 17004 (2013).
S.-H. Yang, AXG et al., J. Appl. Phys. 113, 073513 (2013).
A. A. Greer, AXG et al., Appl. Phys. Lett. 101, 202402 (2012).
A. X. Gray et al., Phys. Rev. B 82, 205116 (2010).
A. X. Gray et al., Appl. Phys. Lett. 97, 062503 (2010).
Highlights of our work on the relevant materials (CaMnO3 and LaNiO3)
M. Golalikhani et al., Nature Comm. 9, 2206 (2018).
R. U. Chandrasena et al., Nano Letters 17, 794 (2017).
D. Eiteneer et al., J. Electron Spectrosc. Rel. Phenom. 211, 70 (2016).
A. M. Kaiser, AXG et al., Phys. Rev. Lett. 107, 116402 (2011).
A. X. Gray et al., Phys. Rev. B 84, 075104 (2011).
R. U. Chandrasena et al., Nano Letters 17, 794 (2017).
D. Eiteneer et al., J. Electron Spectrosc. Rel. Phenom. 211, 70 (2016).
A. M. Kaiser, AXG et al., Phys. Rev. Lett. 107, 116402 (2011).
A. X. Gray et al., Phys. Rev. B 84, 075104 (2011).
Highlights of our ultrafast work at LCLS
T-M. Liu et al., Nature Comm. 10, 1756 (2019).
A. X. Gray et al., Phys. Rev. B 98, 045104 (2018).
P. W. Granitzka et al., Nano Letters 17, 2426 (2017).
T. Henighan et al., Phys. Rev. B 93, 220301(R) (2016).
A. X. Gray et al., Phys. Rev. B 98, 045104 (2018).
P. W. Granitzka et al., Nano Letters 17, 2426 (2017).
T. Henighan et al., Phys. Rev. B 93, 220301(R) (2016).
Book Chapters
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A. X. Gray, Hard X-ray Angle-Resolved Photoelectron Spectroscopy (HARPES), invited chapter in the book Hard X-ray Photoelectron Spectroscopy (HAXPES), J. Woicik, Ed. (Springer, 2016).
S. Nemsak, A. X. Gray, and C. S. Fadley, Standing-Wave and Resonant Soft- and Hard- X-Ray Photoelectron Spectroscopy of Oxide Interfaces, invited chapter in the book Spectroscopy of Transition-Metal Oxide Interfaces, C. Cancellieri and V. N. Strocov, Eds. (Springer, 2018).
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