Andrew Stollenwerk
Assistant Professor of Physics
e-mail: andrew.stollenwerk@uni.edu
Dr. Stollenwerk received a B.S. in physics and a B.A. in mathematics at Miami University in 2002. His graduate work was performed at the University at Albany SUNY, where he received his M.S. in physics in 2004 and his Ph.D. in Nanoscience in 2007. He joined the physics department at the University of Northern Iowa in 2009 after a two year postdoctoral fellowship at Harvard University studying single electron charging in colloidal quantum dots.
The primary research concentration of Dr. Stollenwerk has centered around low dimensional condensed matter systems. He has used. Low dimensional structures exhibit properties that are similar to both individual atoms as well as bulk materials. As material dimensions shrink below 10 nanometers, quantum confinement effects become noticeable in their electronic and optical properties. At the same time low dimensional materials are highly sensitive to the presence of disorder or impurities. The ability to tune the electrical and optical properties of these low dimensional materials by varying their shape, size, and composition have made them useful from a practical stand point in devices such as solar cells, solid state lasers, and light emitting diodes. Studying the properties of individual nanocrystals provides the opportunity to understand the fundamental physics occurring at the nanometer length scale that can be later applied to towards device applications. To achieve this understanding, Dr. Stollenwerk's group has begun assembling a state-of-the-art variable temperature scanning tunneling microscopy laboratory.
Recent Publications
M. Olson Hummon, A. J. Stollenwerk, V. Narayanamurti, M. Panzer, V. Wood, P. Anikeeva and V. Bulovic “Detecting Charging Energy and Charge State of CdSe/ZnS Quantum Dots using a Scanning Tunneling Microscope” Physical Review B (in press) (2009)
(Invited) W. Yi, A. J. Stollenwerk, and V. Narayanamurti “Ballistic Electron Microscopy and Spectroscopy of Metals and Semiconductors” Surface Science Reports 64 169 (2009)
A. J. Stollenwerk, E. J. Spadafora, J. J. Garramone, R. J. Mayti, R. L. Moore and V.P. LaBella “Effect of interface band structure on hot-electron attenuation lengths in Au” Physical Review B 77 033416 (2008)
M. R. Krause, A. J. Stollenwerk, M. Licurse and V.P. LaBella “Measurement of the Clustering Energy of Manganese Silicide Islands on Si(001) by Ostwald Ripening” Applied Physics Letters 91 041903 (2007)
A. J. Stollenwerk, M. R. Krause, J. Garramone, E. Spadafora and V.P. LaBella “Measuring Spin Dependant Hot Electron Transport using Spin-Polarized Ballistic Electron Emission Microscopy” Physical Review B 76 195311 (2007)
M. R. Krause, A. J. Stollenwerk, J. Reed, V. P. LaBella, M. Hortamani, P. Kratzer, and M. Scheffler “Observation of subsurface Mn on the Si(001)-(2x1) reconstructed surface” Physical Review B 75 205326 (2007)
A. J. Stollenwerk, M. Krause, D. H. Idell, R. Moore and V. P. LaBella “Ballistic electron transport properties of Fe-based films on Si(001)” J. Vac. Sci. Technol. B 24 2009 (2006)
A. J. Stollenwerk, M. Krause, D. H. Idell, R. Moore and V. P. LaBella “Probing the Hot Electron Transport Properties and Interface Band Structure of Fe/Si(001) and FeC/Si(001) Schottky Diodes” Physical Review B 74 155328 (2006)
M. R. Krause, A. J. Stollenwerk, M. Licurse and V. P. LaBella “Ostwald Ripening of Manganese Silicide Islands on Si(001)” J. Vac. Sci. Technol. A 24 1480 (2006)
A. J. Stollenwerk, M. Krause, R. Moore and V. P. LaBella “Hot Electron Transport Across Manganese Silicide Layers on the Si(001) Surface” J. Vac. Sci. Technol. A 24 1610 (2006)
M. Bolduc, C. Awo-Affouda, A. J. Stollenwerk, M. B. Huang, F. Ramos and V. P. LaBella “Investigation of the Structural Properties of Ferromagnetic Mn-implanted Si” Nucl. Instrum. Methods 242 367 (2005)
M. Krause, A. J. Stollenwerk, C. Awo-Affouda, B. Maclean, and V. P. LaBella “Combined molecular beam epitaxy low temperature scanning tunneling microscopy system: enabling atomic scale characterization of semiconductor surfaces and interfaces” J. Vac. Sci. Technol. B 23 1684 (2005)
M. Bolduc, C. Awo-Affouda, A. J. Stollenwerk, M. B. Huang, F. Ramos, G. Agnello, and V. P. LaBella “Magnetic and Structural Properties of Mn-implanted Si” Material Research Society Symposium Proceedings 853E 4 (2005)
M. Bolduc, C. Awo-Affouda, A. J. Stollenwerk, M. B. Huang, F. G. Ramos, G. Agnello, and V. P. LaBella “Above Room Temperature Ferromagnetism in Mn-ion implanted Si” Physical Review B 71 033302 (2005)
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