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Current Research
Peter Dowben’s research program concentrates on electronic band structure and the influence of electronics structure on various phase transitions. A large effort is directed toward the study of the electronic (bandstructure) mediated transitions in thin films and overlayers and relating these phase transitions to changes in metallicity and the electronic band structure. In particular, Peter Dowben's group is interested in the nature of the transition - the details of what drives the transition from the clearly nonmetallic to the clearly metallic phase in reduced dimensionality. There is a transition region or a "gray region" between what is clearly nonmetallic and what is metallic. This transition region is a poorly understood aspect of the nonmetal to metal transition.
Strong emphasis is placed on understanding surface and interface electronic structure and related magnetic and ferroelectric properties. The experimental emphasis is on electron spectroscopies including angle-resolved photoemission, angle-resolved inverse photoemission, spin polarized inverse photoemission and spin polarized electron energy loss spectroscopy. Other techniques include low energy electron diffraction, angle-resolved thermal desorption, angle-resolved X-ray photoemission, and light polarization dependent photo-assisted thermal desorption.
Both organic (molecular) and inorganic systems are under investigation, including a variety of ferromagnets and dielectric barrier layer materials.
The research program is funded by the NSF, ONR, and DTRA.
Recent Publications
Xi He, Yi Wang, N. Wu, Siqi Shi, A. Caruso, E. Vescovo, K. D. Belashchenko, P.A. Dowben, Ch. Binek, “Robust isothermal electric control of exchange bias at room temperature”, Nature Materials 9 (2010) 579-585
I. Ketsman, D. Wooten, Jie Xiao, Ya.B. Losovyj, Ya.V. Burak, V.T. Adamiv, A. Sokolov, J. Petrosky, J. McClory, and P.A. Dowben, “The off-axis pyroelectric effect observed for lithium tetraborate”, Phys. Lett. A 374 (2010) 891-895
Celebrating 20 years of Journal of Physics: Condensed Matter—in honour of Richard Palmer, edited by David Ferry, Peter Dowben, and John Ingelsfield, J. Phys. Cond. Matter 21 (2009)
J. A. Colón Santana, R. Skomski, V. Singh, V. Palshin, A. Petukhov, Ya. B. Losovyj, A. Sokolov, P.A. Dowben, and I. Ketsman, “Magnetism of Cr-Doped Diamond”, J. Applied Physics 105 (2009) 07A930, republished in the March 23, 2009 issue of Virtual Journal of Nanoscale Science & Technology
Wisbey, DS (Wisbey, David S.); Wu, N (Wu, Ning); Feng, D (Feng, Danqin); Caruso, A (Caruso, An); Belot, J (Belot, J.); Losovyj, YB (Losovyj, Ya. B.); Vescovoe, E (Vescovoe, E.); Dowben, PA (Dowben, P. A.), "Induced spin polarization of copper spin 1/2 molecular layers", Physics Letters A, 373 (4): 484-488 Jan 19 2009.
Xiao, J (Xiao, Jie); Dowben, PA (Dowben, Peter A.), "Changes in the adsorbate dipole layer with changing d-filling of the metal (II) (Co, Ni, Cu) phthalocyanines on Au(111)", Journal of Physics-Condensed Matter, 21 (5): Art. No. 052001 Feb 4 2009.
Jie Xiao and Peter A. Dowben, "The role of the interface on the electronic structure of adsorbed metal (II) (Co, Ni, Cu) phthalocyanines", J. Materials Chem. 19 (2009) 2172-2178.
Velev, JP (Velev, J. P.); Dowben, PA (Dowben, P. A.); Tsymbal, EY (Tsymbal, E. Y.); Jenkins, SJ (Jenkins, S. J.); Caruso, AN (Caruso, A. N.), "Interface effects in spin-polarized metal/insulator layered structures", Surface Science Reports, 63 (9): 400-425 Sept 15 2008.
Wisbey, D (Wisbey, David); Wu, N (Wu, Ning); Feng, DQ (Feng, Danqin); Caruso, AN (Caruso, A. N.); Belot, J (Belot, John); Losovyj, Y (Losovyj, Yaroslav); Vescovo, E (Vescovo, Elio); Dowben, PA (Dowben, Peter A.)," Interface-induced spin and dipole ordering of the copper spin 1/2 molecule: Bis(4-cyano-2,2,6,6-tetramethyl-3,5-heptanedionato)copper(II)", Journal of Physical Chemistry C, 112 (35): 13656-13662 Sept 4 2008.
Losovyj, YB (Losovyj, Ya. B.); Klinke, M (Klinke, Melanie); Cai, E (Cai, En); Rodriguez, I (Rodriguez, Idaykis); Zhang, JD (Zhang, Jiandi); Makinistian, L (Makinistian, L.); Petukhov, AG (Petukhov, A. G.); Albanesi, EA (Albanesi, E. A.); Galiy, P (Galiy, P.); Fiyala, Y (Fiyala, Ya.); Liu, J (Liu, Jing); Dowben, PA (Dowben, P. A.), "The electronic structure of surface chains in the layered semiconductor In4Se3(100)", Applied Physics Letters, 92 (12): Art. No. 122107 Mar 24 2008. |
Latest Patent (one of 14)Anthony N. Caruso, Jennifer I. Brand, Peter A. Dowben, "Boron carbide particle detectors", United States Patent 7,368,794, issued May 6, 2008 |
Graduate Students
·Ning Wu, Ph.D. 2009 , Department of Physics and Astronomy, University of Nebraska
Now: post-doctoral associate with the University of Nebraska
Thesis: “The Electronic Band Structure of CoS2(100)”
Student prizes: University of Nebraska-Lincoln Frank and Marie Wheeler Fellowship (2007-2008)
· Jie Xiao, Ph.D., Department of Physics and Astronomy, University of Nebraska
Now: post-doctoral associate with the University of Erlangen with Hans-Peter Steinrück
Thesis: “The Study of Molecular Band Offsets at the Heteromolecular Interface”
Student Prizes: Folsom Distinguished Doctoral Dissertation Award Honorable Mention (2010); Humbolt Postdoctoral Fellowship (2010)
· David Wisbey, Ph.D. 2008, now: staff, National Institute of Standards and Technology
· Carolina Ilie, Ph.D. 2008, now: Assistant Professor of Physics,State University of New York at Oswego
· Danqin Feng, Ph.D. 2007, now post-doctoral associate, Department of Chemistry, University of Chicago.
· Luis Rosa, Ph.D. 2005, now post-doctoral associate, Department of Chemistry, Princeton University
· Anthony Caruso, Ph.D. 2004, now Assistant Professor, University of Missouri - Kansas City.
· Hae-Kyung Jeong, Ph.D. 2003, now Research Assistant Professor, Sung Kyung Kwan University.
· Rui-Hua Cheng, Ph.D. 2002, now Assistant Professor of Physics at Purdue University - Indianapolis.
· Takashi Komesu, Ph.D. 2002, now staff at Spring–8.
· Bo Xu, Ph.D. 2002, now Assistant Professor at the Department of Physics, Yanjing University.
· Camelia Borca, Ph.D. 2001, now a staff member at the Paul Scherrer Institute, Switzerland.
