Welcome to Xiaohang's Homepage
		Xiaohang Zhang, Ph.D. NIST-ARRA Postdoctoral Fellow Materials Science and Engineering, University of Maryland Magnetic Materials Group, National Institute of Standards and Technology 100 Bureau Drive, Mail Stop 8552 Gaithersburg, MD 20899 Office Phone #: (301)-975-8876 Email: xhzhang@umd.edu or xiaohang.zhang@nist.gov Curriculum Vitae [PDF]
Research Interest My research interest is the study of magnetic materials, high temperature superconductors, topological insulators, and other novel electron systems as well as their hybrid structures. It is highly expected that the exotic physical properties of these materials and structures will be exploited to develop the next generation electronics. My research has been focused on exploring the physics of the emergent behaviors and pursuing device applications. The synthesis of the materials and the fabrication of the devices often require techniques including crystal growth, thin film fabrication, and lithography, etc. while experimental investigations are usually performed at low temperature and/or in high magnetic field. My current research is mainly focused on four topics: 1) magnetic materials and spintronics; 2) correlated electron physics; 3) topological insulators and their devices; 4) superconductivity in iron pnictides. Education 2002-2008    Ph.D.             Condensed Matter Physics        Florida State University 1998-2001         Master                 Nuclear Engineering                   Tsinghua University, China 1993-1998         Bachelor              Engineering Physics                   Tsinghua University, China Professional Experience NIST-ARRA Postdoctoral Fellow (2011-present), Magnetic Materials Group (Group Leader: Dr. Robert D. Shull), Materials Science and Engineering Division, Material Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg. Postdoctoral Research Associate (2008-2011), Dr. Richard L. Greene’s Research Group, Department of Physics and Center for Nanophysics & Advanced Materials, University of Maryland, College Park. Research Assistant (2004-2008), Advisor: Dr. Peng Xiong, Professor of Physics and Integrative NanoScience Institute, Florida State University, Dissertation Title: “Studies of Novel Magnetic Materials and Interfaces via Electronic Transport and Superconducting Spectroscopy”. [PDF] Lab Instructor (2007 Fall), College Physics B, and Grader (2002), Intermediate Mechanics and Intermediate & Advanced Labs, Department of Physics, Florida State University Experimental Skills Fabrication: thermal and electron-beam evaporation, magnetron sputtering, pulsed laser deposition, photolithography, reactive ion etching, single crystal growth. Structural Characterization: AFM, SEM, XPS, SQUID, X-ray diffraction.   Cryogenic and Transport Measurement Experience: electronic and thermal transport, tunneling spectroscopies, low-noise electronics, He-4, He-3, and dilution refrigeration cryostats, high-field (up to 45T) measurement experience, LabView programming. Publications Xiaohang 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). [Link] [PDF] Xiaohang Zhang, S. von Molnár, Z. Fisk, and P. Xiong, Spin-Dependent Electronic States of the Ferromagnetic Semimetal EuB6, Physical Review Letters 100, 167001 (2008). [Link] [PDF] Xiaohang Zhang, Y. S. Oh, Y. Liu, L. Q. Yan, K. H. Kim, R. L. Greene, and I. Takeuchi, Observation of the Josephson Effect in Pb/Ba1-xKxFe2As2 Single Crystal Junctions, Physical Review Letters 102, 147002 (2009). [Link] [PDF] K. Jin, X. H. Zhang, P. Bach, and R. L. Greene, Evidence for Antiferromagnetic Order in La2-xCexCuO4 from Angular Magnetoresistance Measurements, Physical Review B 80, 012501 (2009). [Link] [PDF] Xiaohang Zhang, S. R. Saha, N. P. Butch, K. Kirshenbaum, Y. Liu, L. Q. Yan, Y. S. Oh, K. H. Kim, J. Paglione, R. L. Greene, and I. Takeuchi, Josephson Effect Between Electron-Doped and Hole-Doped Iron Pnictide Single Crystals, Applied Physics Letters 95, 062510 (2009). [Link] [PDF] Xiaohang Zhang, L. Q. Yu, S. von Molnár, Z. Fisk, and P. Xiong, Nonlinear Hall Effect as a Signature of Electronic Phase Separation in the Ferromagnetic Semimetal EuB6, Physical Review Letters 103, 106602 (2009). [Link] [PDF] B. Saparov, H. He, X. H. Zhang, R. Greene, and S. Bobev, Synthesis, Crystallographic and Theoretical Studies of the New Zintl Phases Ba2Ca2Pn3 (Pn = As, Sb), and the Solid Solutions (Ba1-xSrx)2Cd2Sb3 and Ba2Cd2(Sb1-xAsx)3, Dalton Transactions 39, 1063 (2010). [Link] [PDF] N. P. Butch, S. R. Saha, Xiaohang Zhang, K. Kirshenbaum, R. L. Greene, and J. Paglione, Effective Carrier Type and Field-Dependence of the Reduced-TC Superconducting State in SrFe2-xNixAs2, Physical Review B 81, 024518 (2010). [Link] [PDF] Xiaohang Zhang, Y. S. Oh, Y. Liu, L. Q. Yan, S. R. Saha, N. P. Butch, K. Kirshenbaum, K. H. Kim, J. Paglione, R. L. Greene, and I. Takeuchi, Evidence of a universal and isotropic 2Δ/kBTC ratio in 122-type iron pnictide superconductors over a wide doping range, Physical Review B 82, 020515 (Rapid Communication & Editors’ Suggestion) (2010). [Link] [PDF] K. Jin, P. Bach, X. H. Zhang, U. Grupel, E. Zohar, Y. Dagan, S. Smadici, P. Abbamonte, and R. L. Greene, Anomalous Enhancement of the Superconducting Transition Temperature in Electron-doped La2-xCexCuO4 and Pr2-xCexCuO4 Cuprate Heterostructures. Physical Review B 83, 060511 (Rapid Communication) (2011). [Link] [PDF] Xiaohang Zhang, B.-S. Lee, S.-H Khim, K.-H Kim, R. L. Greene, and I. Takeuchi, Measurement of the order parameter of superconducting LiFeAs in Pb/LiFeAs and Au/LiFeAs junctions by point-contact spectroscopy, Physical Review B 85, 094521 (2012). [Link] [PDF] Xiaohang Zhang, N. P. Butch, P. Syers, S. Ziemak, R. L. Greene, and J. Paglione, Hybridization, Inter-Ion Correlation, and Surface States in the Kondo Insulator SmB6. Physical Review X 3, 011011 (2013). [Link, also see arXiv:1211.5532] [PDF] [Highlighted by Physics and Reported by Nature: Nature 492, 165 (2012)] Conference Presentations & Posters Humidity dependence of molecular tunnel junctions with an AlOx/COOH^- interface (Talk), American Physical Society March Meeting, Baltimore, MD, March 2006. Tunneling study of organic-inorganic interfaces in molecular junctions (Poster), Materials Research Society Fall Meeting, Boston, MA, November 2006. Spin Polarization of the ferromagnetic semimetal EuB6 (Talk), American Physical Society March Meeting, Denver, CO, March 2007. Probing the thiol-gold interface by spin polarized tunneling (Talk), 52^nd Magnetism and Magnetic Materials Conference, Tampa, FL, November 2007. Spin-dependent electronic states of the ferromagnetic semimetal EuB6 (Talk), 52^nd Magnetism and Magnetic Materials Conference, Tampa, FL, November 2007. Unusual Hall effect due to carrier delocalization (Talk), American Physical Society March Meeting, New Orleans, LA, March 2008. Spin-dependent band structure of the ferromagnetic semimetal EuB6 (Talk), American Physical Society March Meeting, New Orleans, LA, March 2008. Observation of the Josephson Effect in Pb/(Ba,K)Fe2As2 Single Crystal Junctions (Talk), American Physical Society March Meeting, Pittsburgh, PA, March 2009. Josephson effect and Andreev-reflection studies on the 122 iron pnictide single crystals (Poster), Applied Superconductivity Conference, Washington, D.C., August 2010. Point Contact Andreev-reflection studies on iron pnictide superconductors (Talk), American Physical Society March Meeting, Dallas, TX, March 2011. Probing the superconducting order parameter of LiFeAs via point contact spectroscopy (Poster), 10^th Materials and Mechanisms of Superconductivity Conference, Washington, D.C., July-August 2012. Invited Presentations Probing spin polarization via superconducting spectroscopy, Department of Physics, New York University, March 3rd, 2008. Josephson Effect studies of pairing symmetry in Fe-based superconductors, American Physical Society March Meeting, Portland, OR, March 2010. Nonlinear Hall effect as a signature of electronic phase separation (Given by P. Xiong), 55^th Magnetism and Magnetic Materials Conference, Atlanta, GA, November, 2010. Professional Services Referee for journals including Science, Physical Review Letters, Physics Review B, Applied Physics Letters, Journal of Applied Physics, New Journal of Physics, Superconductor Science & Technology, etc. Professional Society Membership   American Physical Society (2005 - present)
Links University of Maryland Department of Physics, UMD Center for Nanophysics and Advanced Materials Florida State University Department of Physics, FSU National Institute of Standards and Technology American Physical Society

This site was last updated 2/14/2013