Department of Physics / INSI

409 Keen Building

Florida State University

Tallahassee, FL 32306-4351

email: xiong@martech.fsu.edu

phone: (850)644-5849 (office)

                      -4199 (lab)

                    -6504 (fax)

     

           

 

 

 

      

Group Members

Research Highlights

Laboratories

Publications

Teaching

Outreach

 

 
 
       

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Peng Xiong        

Professor of Physics,  Integrative NanoScience Institute (INSI)

Research

supported by:

NSF

NIH

FSU Foundation

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).

 

 ·      Electronic phase separation due to magnetic correlation

1.   X. Zhang, L. Yu, S. von Molnár, Z. Fisk, and P. Xiong, Nonlinear Hall Effect as a Signature of Electronic Phase Separation, Physical Review Letters 103, 106602 (2009).

2.     B. Raquet, A. Anane, S. Wirth, P. Xiong, and S. von Molnár, Noise Probe of the Dynamic Phase Separation in La2/3Ca1/3MnO3, Physical Review Letters 84, 4485 (2000).

 

 ·      Superconducting quantum phase transitions 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, Europhysics Letters 75, 950 (2006).

 

·        Spin polarization measurement via superconducting spectroscopy

1.     X. Zhang, S. von Molnár, Z. Fisk, and P. Xiong, Spin-dependent Electronic States of the Ferromagnetic Semimetal EuB6, Physical Review Letters 100, 167001 (2008).

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: biosensing

1. 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. Applied Physics 102, 034506 (2007).

2. P. Manandhar, K.-S. Chen, K. Aledealat, G. Mihajlović, C.S. Yun, M. Field, G.J. Sullivan, G.F. Strouse, P.B. Chase, S. von Molnár, and P. Xiong, Detection of Specific Biomolecular Interactions with Micro-Hall Magnetic Sensors, Nanotechnology 20, 355501 (2009).

 

· Nano FET: chemical and biological sensors

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, Applied Physics Letters 89, 093114 (2006).

2. L.L. Fields, J.P. Zheng, Y. Cheng, and P. Xiong, Room-temperature Low-power Hydrogen Sensor Based on a Single Tin Oxide Nanobelt, Applied Physics Letters 88, 263102 (2006).

3. Y. Cheng, P. Xiong, C.S. Yun, G.F. Strouse, J.P. Zheng, R.S. Yang, and Z.L. Wang, Mechanism and Optimization of pH Sensing using SnO2 Nanobelt Field-Effect Transistors, Nano Letters 8, 4179 (2008).

 

·        Hall magnetometry and nanoparticle magnetism

1.      G. Mihajlović, P. Xiong, S. von Molnár, M. Field, and G.J. Sullivan, Magnetic Characterization of a Single Superparamagnetic Bead by Phase-Sensitive Micro-Hall Magnetometry, Applied Physics Letters 91, 172518 (2007).

2.     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, Physical Review Letters 93, 246602 (2004).

 

 ·      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, Applied Physics Letters 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).

 

Peng Xiong graduated with a 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 Integrative NanoScience Institute (INSI) at FSU. 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 four 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. Correlated Electron Physics: magnetotransport and tunneling spectroscopy studies of materials with strong electronic and magnetic correlation.

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

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