Our current research focuses on the physics of oxide heterostructures and their applications in photonic based quantum computing and neuromorphic computing. On the theoretical side of things, we work on the quantum theory of real materials. Experimentally, we specialize in film growth techniques such as molecular beam epitaxy (MBE) and RF magnetron sputtering and film characterization methods such as reflection high-energy electron diffraction (RHEED), x-ray photoelectron spectroscopy (XPS), and x-ray diffraction (XRD). The complex nature of the problems we research often requires high performance computing, most of which is done at the Texas Advanced Computing Center (TACC), film growth, which is done in our state of the art MBE Lab, and film characterization, which is done in our lab and at the Texas Materials Institute.
10 Most Recent Publications
- S. Apte and A. A Demkov, “Linear electro-optic effect in strontium barium niobate:A first principles study,” J. Appl. Phys. 135, 084102 (2024) (Access paper)
- I. Kim and A. A Demkov, “Linear electro-optic effect in trigonal LiNbO3: A first-principles study,” Phys. Rev. Materials 8, 025202 (2024) (Access paper)
- Adam Dodson, Hongrui Wu, Anuruddh Rai, Sohm Apte, Andrew O’Hara, Benjamin Lawrie, Yongqiang Wang, Akira Ueda, Halina Krzyżanowska, Michael Titze, Jimmy Davidson, Anthony Hmelo, Agham B Posadas, Alexander A Demkov, Sokrates T Pantelides, Leonard C Feldman and Norman H Tolk, “Phonon-mediated temperature dependence of Er3+ optical transitions in Er2O3,” Commun. Phys. 7, 69 (2024) (Access paper)
- A. Christensen, A. B. Posadas, B. Zutter, P. Finnegan, S. Bhullar, S. Bishop, A. A. Talin, and A. A. Demkov, “Effect of substrate and growth method on vanadium dioxide thin films by RF magnetron sputtering: Vanadium metal oxidation vs reactive sputtering,” J. Appl. Phys. 131, 015301 (2023). (Access paper)
- M. Reynaud, H. Huyan, C. Du, W. Li, A. B. Posadas, X. Pan, and A. A. Demkov, “Si-Integrated BaTiO3 for Electro-Optic Applications: Crystalline and Polarization Orientation Control,” ACS Appl. Elec. Mat. 5, 4605-4614 (2023). (Access paper)
- A. B. Posadas, V. E. Stenger, J. D. DeFouw, J. H. Warner, and A. A. Demkov, “RF-sputtered Z-cut electro-optic barium titanate modulator on silicon photonic platform,” J. Appl. Phys. 134, 073101 (2023). (Access paper)
- I. Kim, T. Paoletta and A. A. Demkov, “Nature of electro-optic response in tetragonal BaTiO3,” Phys. Rev. B 108, 115201 (2023). (Access paper)
- Z. Dong, A. Raju, A. B. Posadas, M. Reynaud, A. A. Demkov and D. M. Wasserman, “Monolithic barium titanate modulators on silicon-on-insulator substrates,” ACS Photonics 10, 4367 (2023). (Access paper)
- W. Li, J. Lee and A. A. Demkov, “Extrinsic magnetoelectric effect at the BaTiO3/Ni interface,” J. Appl. Phys. 131, 054101 (2022). (Access paper)
- A. B. Posadas, S. Kwon, A. Christensen, M. J. Kim and A. A. Demkov, “Facile growth of epitaxial vanadium monoxide on SrTiO3 via substrate oxygen scavenging,” J. Vac. Sci. Technol. A 40, 013416 (2022). (Access paper)