Welcome to the Demkov Materials Physics Group!
We are always interested in recruiting new students who are interested in condensed matter physics, and hope you will consider our group for your studies.
Demkov Group News
The recently published research by the group (in collaboration with researchers at IBM T. J. Watson Research Center and Oak Ridge National Laboratory) on ``Switching of ferroelectric polarization in epitaxial BaTiO3 films on silicon without a conducting bottom electrode'' (Nat. Nanotechnol. 8, 748 (2013) has recently been featured on as one of the Top-10 Brookhaven Lab Breakthroughs of 2013. Their review of the work can be read here.
New Book on Functional Oxides
Professor Alex Demkov and Senior Scientist Agham B. Posadas are pleased to announce that they have written a book related to the research done by the group titled ``Integration of Functional Oxides with Semiconductors'' to be released in the Spring of 2014. The scope of the book is to provide an understanding of the physical principles of oxide/semiconductor epitaxy. The book describes the current state of the field both in theoretical and experimental advances. The book will be published by Spring under their Briefs in Materials series and can be purchased via Amazon.
- A. A. Demkov and A. B. Posadas, "Integration of Functional Oxides with Semiconductors (Springbriefs in Materials)," Springer, New York (2014).
- T. Q. Ngo, A. B. Posadas, M. D. McDaniel, C.Hu, J. Bruley, E. T. Yu, A. A. Demkov, and J. G. Eerdt, "Epitaxial c-axis oriented BaTiO3-buffered Si(001) by atomic layer deposition," Appl. Phys. Lett. 104, 082910 (2014)
- A. B. Posadas, A. O'Hara, S. Rangan, R. A. Bartynski, and A. A. Demkov, "Band gap of epitaxial in-plane-dimerized single-phase NbO2 films," Appl. Phys. Lett. 104, 092901 (2014).
- T. Q. Ngo, M. D. McDaniel, A. Posadas, A. A. Demkov, and J. G. Ekerdt, "Growth of crystalline LaAlO3 by atomic layer deposition," Proc. SPIE 8987 (Oxide-based Materials and Devices V), 898712 (2014).
- H. Seo, R. C. Hatch, P. Ponath, M. Choi, A. B. Posadas, and A. A. Demkov, "Critical differences in the surface electronic structure of Ge(001) and Si(001): Ab initio theory and angle-resolved photoemission spectroscopy," Phys. Rev. B 89, 115318 (2014)
- M. D. McDaniel, T. Q. Ngo, A. Posadas, C. Hu, S. Lu, D. J. Smith, E. T. Yu, A. A. Demkov, and J. G. Ekerdt, "A Chemical Route to Monolithic Integration of Crystalline Oxides on Semiconductors," to appear in Advanced Materials Interfaces (2014).
- A. O'Hara, G. Bersuker, and A. A. Demkov, "Assessing hafnium on hafnia as an oxygen getter," J. Appl. Phys. 115, 183703 (2014).
- A. O'Hara and A. A. Demkov, "Oxygen and nitrogen diffusion in α-Hafnium from first principles," Appl. Phys. Lett. 104, 211909 (2014).
- M. D. McDaniel, A. Posadas, T. Q. Ngo, C. M. Karako, J. Bruley, M. M. Frank, V. Narayanan, A. A. Demkov, and J. G. Ekerdt, "Incorporation of La in epitaxial SrTiO3 thin films grown by atomic layer deposition on SrTiO3-buffered Si (001) substrates," J. Appl. Phys. 115, 224108 (2014)
- K. D. Fredrickson, P. Ponath, A. B. Posadas, M. R. McCartney, T. Aoki, D. J. Smith, and A. A. Demkov, "Atomic and electronic structure of the ferroelectric BaTiO3-Ge(001) interface," Appl. Phys. Lett. 104, 242908 (2014).
- K. J. Kormondy, A. B. Posadas, A. Slepko, A. Dhamdhere, D. J. Smith, K. N. Mitchell, T. I. Willett-Gies, S. Zollner, L. G. Marshall, J. Zhou, and A. A. Demkov, "Epitaxy of polar semiconductor Co3O4: growth, structure, and characterization," J. Appl. Phys. 115, 243708 (2014).
- R. Dargis, A. Clark, F. E. Arkun, T. Grinys, R. Tomasiunas, A. O'Hara, and A. A. Demkov, "Monolithic integration of rare-earth oxides and semiconductors for on-silicon technology," J. Vac. Sci. Technol. A 32, 041506 (2014).
- M. Choi, A. B. Posadas, C. A. Rodriguez, A. O'Hara, H. Seinige, A. J. Kellock, M. M. Frank, M. Tsoi, S. Zollner, V. Narayanan, and A. A. Demkov, "Structural, optical, and electrical properties of strained La-doped SrTiO3," J. Appl. Phys. 116, 043705 (2014).
- M. Choi, C. Dubourdieu, A. J. Kellock, K. L. Lee, R. A. Haight, A. Pyzyn, M. M. Frank, A. A. Demkov, and V. Narayanan, "Tunable electrical properties of TaNx thin fimls grown by ionized physical vapor deposition," J. Vac. Sci. Technol. B 32, 051202 (2014).
- C. Hu, M. D. McDaniel, A. B. Posadas, A. A. Demkov, J. G Ekerdt, and E. T. Yu, "Highly Controllable and Stable Quantized Conductance and Resistive Switching Mechanism in Single-Crystal TiO2 Resistive Memory on Silicon," Nano Lett. 14, 4360 (2014).
- C. Mitra, C. Lin, A. B. Posadas, and A. A. Demkov, "Role of oxygen vacancies in room-temperature ferromagnetism in cobalt-substituted SrTiO3," Phys. Rev. B 90, 125130 (2014).