Welcome to the homepage of Satoshi Okamoto.

I am a condensed-matter theorist. I have been working on the strongly-correlated electron systems in the form of bulk and artificial heterostructures. For a many-body problem, an exact solution is almost impossible to find except for some special cases. Therefore, in general one has to employ some kind of approximation depending on the problem. I use a variety of techniques ranging from numerical ones to analytical ones. These include Hartee-Fock approximation, auxiliary-particle methods (slave boson, slave fermion or Schwinger boson), spin-wave expansion, static and dynamical mean field methods, bosonization, and also density functional theory. My interest is still growing, covering superconductivity, magnetism, and transport properties of the strongly-correlated systems. So, essentially, I'm interested in all the novel phenomena caused by the strong correlations.

Researcher ID

Selected Publications

  1. E. Assmann, P. Blaha, R. Laskowski, K. Held, S. Okamoto, and G. Sangiovanni, “Oxide Heterostructures for Efficient Solar Cells,” Phys. Rev. Lett. 110, 078701 (2013). This paper is spotlighted as a Synopsis in Physics: Building Better Solar Cells, Layer by Layer
  2. S. Okamoto, “Doped Mott Insulators in (111) Bilayers of Perovskite Transition-Metal Oxides with the Strong Spin-Orbit Coupling,” Phys. Rev. Lett. 110, 066403 (2013).
  3. S. Okamoto, “Strongly-Correlated Heterostructures,” in Multifunctional Oxide Heterostructures, Eds. E. Y. Tsymbal, E. R. A. Dagotto, C.-B. Eom, and R. Ramesh (Oxford University Press, 2012), p.214-253, ISBN: 978-0-19-958412-3.
  4. D. Xiao, W. Zhu, Y. Ran, N. Nagaosa, and S. Okamoto, “Interface engineering of quantum Hall effects in digital transition metal oxide heterostructures,” Nat. Commun. 2:596 doi: 10.1038/ncomms1602 (2011).
  5. J. Salafranca and S. Okamoto, “Unconventional proximity effect and inverse spin-switch behavior in a model manganite-cuprate-manganite trilayer system,” Phys. Rev. Lett. 105, 256804 (2010).
  6. S. Okamoto, D. Sénéchal, M. Civelli, and A.-M. Tremblay, “Dynamical electronic nematicity from Mott physics,” Phys. Rev. B 82, 180511(R) (2010).Editors' Suggestion
  7. J. Garcia-Barriocanal, J. C. Cezar, F. Y. Bruno, P. Thakur, N. B. Brookes, C. Utfeld, A. Rivera-Calzada, S. R. Giblin, J. W. Taylor, J. A. Duffy, S. B. Dugdale, T. Nakamura, K. Kodama, C. Leon, S. Okamoto, and J. Santamaria, “Spin and Orbital Ti Magnetism at LaMnO3/SrTiO3 Interfaces,” Nat. Commun. 1:82 doi: 10.1038/ncomms1080 (2010).
  8. A. Y. Borisevich, H. J. Chang, M. Huijben, M. P. Oxley, S. Okamoto, M. K. Niranjan, J. D. Burton, E.Y. Tsymbal, Y. H. Chu, P. Yu, R. Ramesh, S. V. Kalinin, and S. J. Pennycook, “Suppression of Octahedral Tilts and Associated Changes in Electronic Properties at Epitaxial Oxide Heterostructure Interfaces,” Phys. Rev. Lett. 105, 087204 (2010).
  9. S. Okamoto, “Magnetic interaction at an interface between manganite and other transition-metal oxides,” Phys. Rev. B 82, 024427 (2010).
  10. P. Yu, J.-S. Lee, S. Okamoto, M. D. Rossell, M. Huijben, C.-H. Yang, Q. He, J. X. Zhang, S.Y. Yang, M. J. Lee, Q. M. Ramasse, R. Erni, Y.-H. Chu, D. A. Arena, C.-C. Kao, L.W. Martin, and R. Ramesh, “Interface Ferromagnetism and Orbital Reconstruction in BiFeO3-La0.7Sr0.3MnO3 Heterostructure,” Phys. Rev. Lett. 105, 027201 (2010).
  11. K. Yoshimatsu, T. Okabe, H. Kumigashira, S. Okamoto, S. Aizaki, A. Fujimori, and M. Oshima, “Dimensional-Crossover-Driven Metal-Insulator Transition in SrVO3 Ultrathin Films,” Phys. Rev. Lett. 104, 147601 (2010).
  12. R. S. Fishman and S. Okamoto, “Noncollinear magnetic phases of a triangular-lattice antiferromagnet and of doped CuFeO2,” Phys. Rev. B 81, 020402(R) (2010).
  13. R. S. Fishman, S. Okamoto, W. W. Shum, and J. S. Miller, “Giant antiferromagnetically coupled moments in a molecule-based magnet with interpenetrating lattices,” Phys. Rev. B 80, 064401 (2009).
  14. S. Okamoto and Th. A. Maier, “Enhanced Superconductivity in Superlattices of High-Tc Cuprates,” Phys. Rev. Lett. 101, 156401 (2008).
  15. S. Okamoto, “Nonlinear Transport through Strongly Correlated Two-Terminal Heterostructures: A Dynamical Mean-Field Approach,” Phys. Rev. Lett. 101, 116807 (2008).
  16. S. Yunoki, A. Moreo, E. Dagotto, S. Okamoto, S. S. Kancharla, A. Fujimori, “Electron Doping of Cuprates via Interfaces with Manganites,” Phys. Rev. B 76, No. 6, 064532 (2007).
  17. S. S. Kancharla and S. Okamoto, “Band insulator to Mott insulator transition in a bilayer Hubbard model,” Phys. Rev. B 75, 193103 (2007).
  18. M. Takizawa, H. Wadati, K. Tanaka, M. Hashimoto, T. Yoshida, A. Fujimori, A. Chikamatsu, H. Kumigashira, M. Oshima, K. Shibuya, T. Mihara, T. Ohnishi, M. Lippmaa, M. Kawasaki, H. Koinuma, S. Okamoto, and A. J. Millis, “Photoemission from Buried Interfaces in SrTiO3/LaTiO3 Superlattices,” Phys. Rev. Lett. 97, 057601 (2006).
  19. S. Okamoto, A. J. Millis, and N. A. Spaldin, “Lattice relaxation in oxide heterostructures: LaTiO3/SrTiO3 superlattices,” Phys. Rev. Lett. 97, 056802 (2006).
  20. S. Okamoto and A. J. Millis, “Spatial inhomogeneity and strong correlation physics: A dynamical mean-field study of a model Mott-insulator-band-insulator heterostructure,” Phys. Rev. B 70, 241104(R) (2004).
  21. S. Okamoto and A. J. Millis, “Electronic reconstruction at an interface between a Mott insulator and a band insulator,” Nature (London) 428, 630 (2004).
Full Publication list