Charles Bessey Professor of Physics,
Nebraska Center for Materials and Nanoscience
310L Jorgensen Hall
Author of more than 550 articles in refereed journals and books, 34 invited review articles, 28 invited presentations at national and international conferences, and 23 patents. Some papers may be found on the digital commons: http://digitalcommons.unl.edu/physicsdowben/
2002 - present: Charles Bessey Professor, University of Nebraska
1995 - present: Professor of Physics and Graduate Fellow, University of Nebraska
1994 - present: Research Professor of Chemistry, University of Nebraska
1993 - 1995: Associate Prof. of Physics and Graduate Fellow, University of Nebraska
1990 - 1993: Associate Prof. of Physics, Syracuse University, Syracuse, New York
1987 - 1996: Adjunct Prof. of Chemistry, Syracuse University, Syracuse, New York
1986 - 1993: Member of Solid State Science and Technology Program, Syracuse University, Syracuse, New York
1984 - 1990: Assistant Prof. of Physics, Syracuse University, Syracuse, New York
1981 - 1983: Scientist with the Fritz-Haber Institut der Max-Planck-Gesellschaft, FRG
1981 - Visiting Scientist to the Department of Physics, University Osnabrueck, FRG
1980 - 1981: Research Assistant to Dr. M. Grunze, Fritz-Haber Institut der Max-Planck Gesellschaft, and the Free University, Berlin, FRG
1981 - Ph.D. in Physics, University of Cambridge
Interests and Capabilities
The major focus of the Dowben group emphasizes the changes in electronic (band) structure across electronic phase transitions in reduced dimensionality. Of interest are ferromagnetism in local moment systems or spatially restricted systems, ferroelectricity and the nonmetal to metal transition.
Specific techniques include angle-resolved photoemission, resonant photoemission, inverse photoemission and spin polarized inverse photoemission. Other techniques include spin polarized photoemission, characteristic energy loss, low energy electron diffraction, angle resolved thermal desorption spectroscopy, X-ray photoemission, and magneto-optic Kerr effect.
- Organic and organometallic chemical vapor deposition of materials in ultrahigh vacuum for spin valves and spin-tunnel junctions.
- Orientation, bonding and electronic structure of organic overlayers, organometallic molecular overlayers and molecular magnets.
- The temperature dependent electronic structure of ferroelectric crystalline molecular films, as a function of metallicity.
- The spin polarized occupied and unoccupied band structure of local moment ferromagnetic systems as a function of temperature.
Funded by the NSF, NSF Polarization and Spin Phenomena MRSEC (DMR-1420645), the Defense Threat Reduction Agency, the Semiconductor Research Corporation-DARPA joint program, the SRC-NRI NIST initiative, NASA and Intel.
|Group Personnel||Collaborators at UNL|
Elena Echevarria Mora
|Kirill Belashchenko (Physics)
Christian Binek (Physics)
Alexei Gruverman (Physics)
Xia Hong (Physics)
Wai-Ning Mei (Physics)
R. Skomski (Physics)
Alexander Sinitskii (Chemistry)
Evgeny Tsymbal (Physics)
Xiaoshan Xu (Physics)
Recent Results and Key References
Limits to Half Metallic Ferromagnetism:
P.A. Dowben, J. Phys. Cond. Matter 19 (2007) 31031, and the papers that follow in that issue of JPCM.
Xin Zhang, Ning Wu, M. Manno, C. Leighton, Elio Vescovo, P.A. Dowben, "Resonant Photoemission and Spin Polarization of Co1-xFexS2", Journ. Phys. Condens. Matter 25 (2013) 012001
P.A. Dowben and S.J. Jenkins. "The Limits to Spin-Polarization in Finite-Temperature Half- Metallic Ferromagnets", in Frontiers in Magnetic Materials, edited by Anant Narlikar, Springer Verlag (2005).
N.Wu, P. A. Dowben, "Magnetic Surface States in High Polarization Materials", Spintronics IV, edited by H. Drouhin, J. Wegrowe, M. Razeghi, Proc. of SPIE Vol. 8100 (2011) 81000T.
P.A. Dowben and R. Skomski, "Are Half-Metallic Ferromagnets Half-Metals? (invited)", Journal of Applied Physics 95 (2004) 7453-7458.
Electrostatic Dipolar Coupling on the Local Scale:
X. Zhang, T. Palamarciuc, J.-F. Létard, P. Rosa, E. Vega Lozada, F. Torres, L.G. Rosa, B. Doudin and P.A. Dowben, "Spin State of a Molecular Adsorbate Driven by the Ferroelectric Substrate Polarization", ChemComm. 50 (2014) 2255
Z. Zhang, J. Alvira, X. Barbosa, L. B. Rosa, L. Routaboul, P. Braunstein, B. Doudin, P. A. Dowben, "Lock and Key Absorption Chemistry: Preferential Abstorption of an Isomer of Di-Iodobenzene on Molecular Films of Quinonoid Zitterions", J. Physical Chemistry C 115 (2011) 2812-2818.
Z. Zhang, R. Gonzalez, G. Diaz, L. G. Rosa, I. Ketsman, X. Zhang, P. Sharma, A. Gruverman, P. A. Dowben, "Polarization Mediated Chemistry on Polymer Ferroelectric Surfaces", J. Phys. Chem. C 115 (2011) 13041-13046.
D. Kunkel, S. Simpson, J. Nitz, G. Rojas, E. Zurek, L. Routaboul, B. Doudin, P. Braunstein, P. Dowben, and A. Enders, "Dipole Driven Bonding Schemes of Quinonoid Zwitterions on Surfaces", Chem. Comm. 48 (2012) 7143-7145
Recent General Papers on Surface & Interface Magnetism:
Xi He, Yi Wang, Ning Wu, Anthony N. Caruso, Elio Vescovo, Kirill D. Belashchenko, Peter A. Dowben and Christian Binek, "Robust Isothermal Electric Control of Exchange Bias at Room Temperature", Nature Materials 9 (2010) 579-585.
N. Wu, Xi He, A. Wysocki, U. Lanke, T. Komesu, K.D. Belaschenko, Ch. Binek, and P.A. Dowben, "Imaging and control of surface magnetization domains in a magnetoelectric antiferromagnet", Physical Review Letters 106 (2011) 087202
Shi Cao, Xin Zhang, Ning Wu, A. T. N'Diaye, G. Chen, A. K. Schmid, Xumin Chen, W. Echtenkamp, A. Enders, Ch. Binek, P. A. Dowben, "Spin Polarization Asymmetry at the Surface of Chromia", New Journal of Physics 16 (2014) 073021.
J.P. Velev, P.A. Dowben, E.Y. Tsymbal, S.J. Jenkins and A.N. Caruso, "Interface Effects in Spin-Polarized Metal/Insulator Layered Structures", Surface Science Reports 63 (2008) 400-425.
S. Cao, P. Liu, J. Tang, H. Lu, C.W. Bark, S. Ryu, C.B. Eom, A. Gruverman, and P.A. Dowben, "Magnetoelectric Coupling at the EuO/BaTiO3 Interface", Applied Physics Letters 102 (2013) 172402
Graduate Students (and Current Affiliations)
|Name||Degree Date||Current Affiliation|
|Daniel C. Driscoll||Ph.D. 1987||Naval Surface Warfare Center, Virginia|
|Hans-Jorg Ruppender||Dipl. Chem. 1987||CEO Omnivac, Kaiserslautern, FRG|
|Greg T. Stauf||Ph.D. 1988||IP Value, Branchburg, NJ|
|Sangramitra Baral||M. Sc. 1990||NRL|
|Shikha Varma||Ph.D. 1990||Associate Professor of Physics, Institute of Physics, Bhubaneswar, India|
|David LaGraffe||Ph.D. 1990||Director, Office of Poliferation Detection, NA-221, National Nuclear Security Administration|
|Yolanda Kime||Ph.D. 1991||S.U.N.Y-Cortland, Professor Emeritus, Software Developer, Chicago|
|John Mazurowski||M.Sc. 1992||Senior Engineer, Pennsylvania State Univ. Electro-Optic Cntr. http://www.electro-optics.org|
|Yoon-Gi Kim||Ph.D. 1992||Samsung Electronics, South Korea|
|Sunwoo Lee||Ph.D. 1992||Patent Law, Roetzel & Andress, Washington D.C.|
|Dongqi Li||Ph.D. 1993||On disability leave|
|Jiandi Zhang||Ph.D. 1994||Professor of Physics, Louisiana State University
|Dongjin Byun||Ph.D. 1995||Professor, Dept. of Materials Science and Engineering, Korea University|
|Seong-Don Hwang||Ph.D. 1996||Patent Lawyer, Seoul, Korea|
|John Kushneir III||M.Sc. 1996||Leybold-Inficon, East Syracuse|
|Tara Jean McAvoy||M.Sc. 1997||Process Engineer with Raytheon, California|
|Dulip Welipitiya||Ph.D. 1997||Headway Technologies, Milpitas, CA|
|Carlo Waldfried||Ph.D. 1998||Director of Innovation, Entegris|
|Jaewu Choi||Ph.D. 1998||Professor, Dept. of Information Display, Kyung Hee University, Korea|
|Delia Ristoiu||Ph.D. 2000||ST - Microelectronics, Grenoble, France|
|Hanni Dulli||Ph.D. 2000||Instructor, Dept. of Physics, Texas Tech University|
|Camelia Borca||Ph.D. 2001||Staff, Paul Scherrer Institute|
|Laeticia Bernard||Diplom Physiker 2002||Staff, Paul Scherrer Institute|
|Rui-Hua Cheng||Ph.D. 2002||Associate Professor, Indiana University - Purdue - Indianapolis|
|Takashi Komesu||Ph.D. 2002||Research Associate Professor, UNL|
|Bo Xu||Ph.D. 2002||Professor of Physics, Yanshan University|
|Hae-Kyung Jeong||Ph.D. 2003||Professor, Daegu University|
|Anthony Caruso||Ph.D. 2004||Professor and Assistant Vice Chancellor of Research, Univ. of Missouri - Kansas City|
|Luis Rosa||Ph.D. 2005||Associate Professor of Physics, University of Puerto Rico - Humacao|
|Snow Balaz||M.Sc. 2005
(Ph.D. in Engineering with J. Brand, 2007)
|Assistant Professor, Department of Physics, Youngstown State University|
|Danqin Feng||Ph.D. 2007||Lumentum, Santa Barbara, California|
|Carolina Ilie||Ph.D. 2008||Associate Professor of Physics, S.U.N.Y. - Oswego|
|David Wisbey||Ph.D. 2008||Assistant Professor of Physics, St. Louis University, St. Louis, MO|
|Jie Xiao||Ph.D. 2009||Staff, BESSY II, Berlin|
|Ning Wu||Ph.D. 2009||Staff, Western Digital|
|David Wooten||Ph.D. 2010||Staff, STRATCOM|
|Jing Liu||Ph.D. 2011||Post-Doc, Yeshiva University|
|Zheng Zheng Zhang||Ph.D. 2011||Staff, American Institute of Physics|
|Juan Colón Santana||Ph.D. 2012||Assistant Professor, Aurora University|
|Keisuke Fukutani||Ph.D. 2012||Staff, Institute for Basic Sciences|
|Lingmei Kong||Ph.D. 2012||Analyst, Thomson Reuters|
|Xin Zhang||Ph.D. 2016||Staff, X-ray Optical Systems|
Post-docs (and Current Affiliations)
|Name||Date(s) Worked For Dowben||Current Affiliation|
|David McIlroy||1993-1996||Professor of Physics and Department Head, Oklahoma State University|
|Jiandi Zhang||1994-1995||Professor of Physics, Louisiana State University
|Zhenchen Zhong||1997-1999||Professor, Materials Science, Nanchang Hong Kong University|
|Jaewu Choi||1998-2001||Dept. of Information Display, Kyung Hee University, Korea|
|Hae-Kyung Jeong||2003-2004||Professor, Daegu University|
|Takashi Komesu||2007, 2013-Present||University of Nebraska|
|Ihor Ketsman||2006 - 2011||passed away 2013|
|Jie Xiao||2009 - 2010||Staff, BESSY II, Berlin|
|Ning Wu||2009 - 2012||Staff, Western Digital|
|Dong Jik Kim||2014||University of Seoul, Korea|
|Aiyun Liu||2015-2016||Shanghia Normal University|