UCR

Department of Physics & Astronomy



Ward P. Beyermann


Ward Beyermann

Ward P. Beyermann

Associate Professor

Office:
Physics 3056

Telephone: 951-827-3947/2398
Email: ward.beyermann@ucr.edu
Fax: 951-827-4529

Research Interests:

  • Experimental condensed matter physics

Education:

Ph.D. 1988, University of California, Los Angeles

Current Research:

Strong correlations between electrons and other excitations are responsible for many interesting properties in condensed matter physics, and often they lead to emergent behavior and exotic ground states. My primary research activity has been to investigate phenomenon associated with many-body interactions, and the manifestation of these interactions in the context of artificially structured systems with nanoscale dimensions where quantum effects dominate. Often this research is collaborative with other researchers providing the materials that are investigated.

The research can be grouped into three main thrusts:

Transport, Thermodynamic and Magnetic Properties of Exotic Materials. At UCR, I have several cryostats for measuring thermodynamic, transport and magnetic properties over a very wide range of temperature and applied magnetic field. The most important components of this capability are a Physical Properties Measurement System (PPMS) and a Magnetic Properties Measurement System (MPMS). With these instruments, charge and thermal transport, specific heat, and magnetic properties can be measured over a wide range of temperatures (0.4K-800K) and fields (up to 14T). Two examples of research conducted with these instruments are measurements on epitaxial grown topological insulators and exotic chalcogenide supertetrahedral clusters with the potential for multi-scale interactions.

Magnetism in Transition Metal Oxides. These materials display rich, interesting behavior, including a unique relationship between charge and spin degrees of freedom. Much of my work is focused on iron and zinc oxides. Magnetism is a well-established property for iron oxides; however, changing the structure at nanometer length scales affects these properties in unique ways. Zinc oxide is a wide bandgap semiconductor that displays long-range ferromagnetic order when doped with certain magnetic impurities. The magnetic ground state has a very high transition temperature, and in addition to being an interesting phenomenon, there is the potential for applications with spintronic devices.

THz Spectrometry. My capability for studying charge dynamics is extended to higher frequencies with a terahertz spectrometer. This instrument utilizes an ultrafast-pulsed laser to generate and coherently detect radiation over a broad range of frequencies, and from these data it is possible to determine the real and imaginary optical response without the need for a Kramers-Kronig analysis. Despite being a difficult range of the optical spectrum to measure, many characteristic energy scales that are relevant to correlated-electron interactions in novel materials fall in this frequency range. Initially, this instrument was used to investigate biological materials, such as nucliotides and various forms of DNA. These systems have very complex structures, interact strongly with their environment and have interactions at multiple length scales. The spectrometer is now being used to study Dirac materials, such as single and multilayer graphene.

Recent Publications:

  1. Z. Yang Z, J. L. Liu, M. Biasini, W. P. Beyermann, “Electron concentration dependent magnetization and magnetic anisotropy in ZnO:Mn thin films,” Applied Physics Letters 92, 042111-1-3 (2008).

  2. J. R. Morales, J. E. Garay, M. Biasini, W. P. Beyermann, “Magnetic characterization of bulk nanostructured iron oxides,” Applied Physics Letters 93, 022511-1 (2008).

  3. Z. Yang, M. Biasini, W. P. Beyermann, M. B. Katz, O. K. Ezekoye, X. Q. Pan, Y. Pu, J. Shi, Z. Zuo, J. L. Liu, “Electron carrier concentration dependent magnetization and transport properties in ZnO:Co diluted magnetic semiconductor thin films,” Journal of Applied Physics 104, 113712 (2008).

  4. P. Glancy and W. P. Beyermann, “Dielectric response of suspended nucleotides at terahertz frequencies,” Proceedings of the 33rd International Conference on Infrared, Millimeter and Terahertz Waves, 2008.  Published September 15-19 2008 on ieeexplore.ieee.org, Digital Object Identifier: 10.1109/ICIMW.2008.4682740.

  5. Z. Yang, W. P. Beyermann, M. B. Katz, O. K. Ezekoye, Z. Zuo, Y. Pu, J. Shi, X. Q. Pan, J. L. Liu, “Microstructure and transport properties of ZnO:Mn diluted magnetic semiconductor thin films,” Journal of Applied Physics 105, 053708 (2009).

  6. Lei Shu, D. E. MacLaughlin, W. P. Beyermann, R. H. Heffner, G. D. Morris, O. O. Bernal, F. D. Callaghan, J. E. Sonier, W. M. Yuhasz, N. A. Frederick, M. B. Maples, “Penetration depth, multiband superconductivity, ad absence of muon-induced perturbation in superconducting PrOs4Sb12,” Phys. Rev. B 79, 174511-10 (2009).

  7. P. Glancy and W. P. Beyermann, “Dielectric properties of fully hydrated nucleotides in the terahertz frequency range,” J. Chem. Phys. 132, 245102-9 (2010).

  8. J. R. Morales, S. Tanju, W. P. Beyermann, J. E. Garay, “Exchnage bias in large three dimensional iron oxide nanocomposites,” Applied Physics Letters, 96, 013102 (2010).

  9. Yong Wang, Faxian Xiu, Ya Wang, Jin Zou, Wand P. Beyermann, Yi Zhou, Kang L. Wang, “Coherent magnetic semiconductor nanodot arrays,” Nanoscale Reseach Letters 6, 134 (2011).

  10. Taehyung Kim, Le He, Jason R. Morales, W. P. Beyermann, Christopher J. Bardeen, “Magnetic field control of fluorescent polymer nanorods,” Nanotechnology 22 455704 (2011).

  11. Z. Yang, Z. Zuo, H. M. Zhou, W. P. Beyermann, J. L. Liu, “Epitaxial Mn-doped ZnO diluted magnetic semiconductor thin films grown by plasma-assisted molecular-beam epitaxy,” Journal of Crystal Growth 314, 97-103 (2011).

  12. Liang He, Faxian Xiu, Yong Wang, Alexei V. Fedorov, Guan Huang, Xufeng Kou, Murong Lang, Wand P. Beyermann, Jin Zou, Kang L. Wang, “Epitaxial growth of Bi2Se3 topological insulator thin films on Si(111),”  J. Appl. Phys. 109, 103702 (2011).

  13. Le Wang, Jason Morales, Tao Wu, Xiang Zhao, Ward P. Beyermann, Xianhui Bu, Pingyun Feng, “Assembly of super-supertetrahedral metal-organic clusters into a hierarchical porous cubic framework,” Chem. Commun. 48, 7498-7500 (2012).

  14. Zheng Zuo, Huimei Zhou, Mario J. Olmedo, Jieying Kong, Ward P. Beyermann, Jian-Guo Zheng, Yan Xin, Jianlin Liu, “Strong room-temperature ferromagnetism on high-quality lightly Mn-doped ZnO grown by molecular beam epitaxy,” J. Appl. Phys. 112, 053708-6 (2012).

  15. Zheng Zuo, Muhammad Morshed, W. P. Beyermann, Jian-Guo Zheng, Yan Xin, Jianlin Liu, “Peculiarly strong room-temperature ferromagnetism from low Mn-doping in ZnO grown by molecular beam epitaxy,” AIP Advances 3, 0321110-16 (2013).


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