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Peng Xiong        

Professor of Physics,  Center for Materials Research and Technology

Research

supported by:

Selected Recent Publications:

 

· Molecular tunnel junctions

1. X. Zhang, S.A. McGill, and P. Xiong, Origin of the Humidity Sensitivity of Al/AlOx/MHA/Au Molecular Tunnel Junctions, Journal of the American Chemical Society 129, 14470 (2007).

 

·         Magnetic junctions

1.      J.S. Parker, P.G. Ivanov, D.M. Lind, P. Xiong, and Y. Xin, Large Inverse Magnetoresistance of CrO2/Co Junctions with an Artificial Barrier, Phys. Rev. B. 69, 220413(R) (2004).

2.      C. Ren, J. Trbovic, P. Xiong, and S. von Molnár, Zeeman Splitting in Ferromagnetic Schottky Barrier Contacts Based on Doped EuS, Appl. Phys. Lett. 86, 012501 (2005).

 

·         Magnetic semiconductors

1.      I.J. Guilaran, D.E. Read, R. Kallaher, P. Xiong, S. von Molnár, P. Stampe, R. Kennedy, and J. Keller, Observation of Anomalous Hall Effect in Thin Film EuS, Phys. Rev. B 68, 144424 (2003).

2.      R. Kennedy, P. Stampe, E. Hu, P. Xiong, S. von Molnár, and Y. Xin, Hopping Transport in TiO2:Co; A Signature of Multiphase Behavior, Appl. Phys. Lett. 84, 2832 (2004).

 

·         Spin polarization measurement via superconducting spectroscopy

1.      J.S. Parker, S.M. Watts, P.G. Ivanov, and P. Xiong, Spin Polarization of CrO2 at and across an Artificial Barrier, Phys. Rev. Lett. 88, 196601 (2002).

2.      C. Ren, J. Trbovic, J.G. Braden, R.L. Kallaher, J.S. Parker, S. von Molnár, and P. Xiong, Measurement of the Spin Polarization of the Magnetic Semiconductor EuS with Zero-field and Zeeman-split Andreev Reflection Spectroscopy, Physical Review B 75, 205208 (2007).

  

·         Hall magnetometry and nanoparticle magnetism

1.      Y. Li, C. Ren, P. Xiong, S. von Molnár, Y. Ohno, and H. Ohno, Modulation of Noise in Submicron GaAs/AlGaAs Hall Devices by Gating, Phys. Rev. Lett. 93, 246602 (2004).

2.      Y. Li, P. Xiong, S. von Molnár, Y. Ohno, and H. Ohno, Magnetization Reversal in Elongated Fe Nanoparticles, Phys. Rev. B. 71, 214425 (2005).

 

 ·         Hybrid biomechanical nanostructures

1.      G. Mihajlović, N. M. Brunet, J. Trbović, P. Xiong, S. von Molnár, and P. B. Chase, An All Electrical Switching and Control Mechanism for Actomyosin-Powered Nanoactuators, Appl. Phys. Lett. 85, 1060 (2004).

2.      T.J. Grove, K.A. Puckett, N.M. Brunet, G. Mihajlović, L.A. McFadden, P. Xiong, S. von Molnár, T.S. Moerland and P.B. Chase, Packaging Actomyosin-based Biomolecular Motor-driven Devices for Nnanoactuator Applications, IEEE Transactions on Advanced Packaging 28, 556 (2005).

 

·         Hall magnetometry: biosensing

1.      G. Mihajlovic, P. Xiong, S. von Molnár, K. Ohtani, H. Ohno, M. Field, and G.J. Sullivan, Detection of Single Magnetic Bead for Biological Applications using an InAs Quantum-Well Micro-Hall Sensor, Appl. Phys. Lett. 87, 112502 (2005).

2.     G. Mihajlović, P. Xiong, S. von Molnár, M. Field, and G.J. Sullivan, InAs Quantum Well Hall Devices for Room-Temperature Detection of Single Magnetic Biomolecular Labels, J. Appl. Phys. 102, 034506 (2007).

 

· Nano FET: sensors and assembly

1.    Y. Cheng, P. Xiong, L.L. Fields, J.P. Zheng, R. Yang, and Z.L. Wang, Intrinsic Characteristics of Semiconducting Oxide Nanobelt Field Effect Transistors, Appl. Phys. Lett. 89, 093114 (2006).

2.     S.A. McGill, S.G. Rao, P. Manandhar, S. Hong, and P. Xiong, High-performance, Hysteresis-free Carbon Nanotube FETs via Directed Assembly, Appl. Phys. Lett. 89, 163123 (2006).

 

·         Superconducting quantum phase transition in 2D

1.      J.S. Parker, D.E. Read, A. Kumar, and P. Xiong, Superconducting Quantum Phase Transitions Tuned by Magnetic Impurity and Magnetic Field in Ultrathin a-Pb Films, Europhys. Lett. 75, 950 (2006).

Peng Xiong received his B.Sc. in Physics from University of Science and Technology of China in July 1987. He received his Ph.D in Physics from Brown University in September 1993, with a thesis covering topics of high temperature superconductivity, magnetic granular solids, and mesoscale superconductivity. He then spent the next four years as a postdoctoral fellow at the University of California at San Diego, performing research in superconductor-insulator transition and fluctuation effects in two- and one-dimensional systems. He joined the Physics faculty of the Florida State University in November of 1997. He is a member of the Center for Materials Research and Technology (MARTECH). He was a recipient of the Alfred P. Sloan Research Fellowship (1998), University Teaching Award (FSU, 2003), PAI Award for Excellence in Research and Teaching (FSU, 2004), and Developing Scholar Award (FSU, 2007).

 His research activities can be loosely categorized into the following three areas:

1. Mesoscale Physics: quantum phase transitions and fluctuation effects in 2D and 1D superconducting systems; semiconductor nanowire and carbon nanotube devices; nano magnetism.

2. Spintronics: spin polarized transport in ferromagnet/normal metal,  ferromagnet/superconductor, and ferromagnet/semiconductor hybrid structures; magnetic semiconductors; spin injection and detection.

3. Organic/Solid-State Hybrid Structures: magnetically- and electrically-based nanoscale biosensors; nanoscale bio-mechanical devices; electron transport at organic/solid-state interfaces; template-directed self-assembly of nanostructures.