Judy J. Cha

Carol and Douglas Melamed Assistant Professor of Mechanical Engineering & Materials Science
Office Address:
Becton 209, 15 Prospect St, New Haven, CT; Lab: 311D, Molecular Innovations Center, 600 West Campus Dr, Orange, CT
Mailing Address:
P.O. Box 208284
New Haven, CT 06520
Phone: W. Campus: (203) 737-7293; Main Campus: (203) 432-2156
Fax: (203) 432-6775
Email: jeeyoung.cha@yale.edu
  • Ph.D., Cornell University
  • B.A. Sc., Simon Fraser University, Canada


The Cha research group focuses on synthesis and transport measurements of two-dimensional layered nanochalcogenides, in particular topological insulator nanoribbons and nanoplates. The group uses analytical scanning transmission electron microscopy and electron energy-loss spectroscopy to investigate the fundamental structure-property relationships of the synthesized nanomaterials for novel electronic, photonic, and plasmonic properties. Other chalcogenide systems are also investigated for energy applications.

Selected Awards & Honors:

  • Presidential Student Award, Microscopy Society of America (2010)
  • Silver Award, Materials Research Society (2008, Spring)
  • Distinguished Scholar Award, Microbeam Analysis Society (2008)

Selected Publications:

  • Topological insulator nanostructures (invited review article), J. J. Cha, K. J. Koski, Y. Cui, physica status solidi – Rapid Research Letters DOI 10.1002/pssr.201206393 (2012)
  • Effects of magnetic doping on weak antilocalization in narrow Bi2Se3 nanoribbons, J. J. Cha, M. Claassen, D. Kong, S. S. Hong, K. J. Koski, X.-L. Qi, Y. Cui, Nano Letters 12, p.4355-4359 (2012)
  • Weak antilocalization in Bi2(SexTe1-x)3 nanoribbons and nanoplates, J. J. Cha, D. Kong, S. S. Hong, J. G. Analytis, K. Lai, Y. Cui, Nano Letters 12, p.1107-1111 (2012)
  • Ultra-low carrier concentration and surface-dominant transport in antimony-doped Bi2Se3 topological insulator nanoribbons, S. S. Hong, J. J. Cha, D. Kong, Y. Cui, Nature Communications 3:757 doi:10.1038/ncomms1771 (2012)
  • Sulfur-TiO2 yolk-shell nanoarchitecture with internal void space for long-cycle lithium-sulfur batteries, Z. W. Seh, W. Li, J. J. Cha, G. Zheng, Y. Yang, M. T. McDowell, P.-C. Hsu, Y. Cui, Nature Communications 4:1331 doi:10.1038/ncomms2327 (2013)
  • Self-limited plasmonic welding of silver nanowire junctions, E. C. Garnett, W. Cai, J. J. Cha, et. al., Nature Materials 11, p.241-249 (2012)
  • Ambipolar field effect in the ternary topological insulator (BixSb1-x)2Te3 by composition tuning, D. Kong, Y. Chen, J. J. Cha, et. al., Nature Nanotechnology 6, p.705-709 (2011)