Paola Barbara

Paola Barbara

Associate Professor

322 Regents Hall
Telephone: (202) 687-6025

P. Barbara received her M. S. degree (Laurea in Fisica) at the University of Salerno, Italy, in 1991 and her Ph. D. in Physics at the Technical University of Denmark, in Lyngby, Denmark, in 1995. Her thesis research was an experimental study of non-linear dynamics in coupled superconducting transmission lines. Prior to joining the faculty at Georgetown University, she worked at the Center for Superconductivity Research (currently Center for Nanophysics and Advanced Materials) at the University of Maryland as a postdoctoral associate. She studied Josephson junction arrays, including their synchronization properties (stimulated emission and amplification) and their magnetic properties (to understand unusual phenomena like the paramagnetic Meissner effect occurring in high-Tc granular superconductors). She is currently working on physics and applications of carbon nanotubes. Dr. Barbara was the recipient of a NSF 2003 Presidential Early Career Award for Scientists and Engineers (PECASE) and a Research Innovation Award from Research Corporation.

Current Research

My current research focuses on phase coherent transport in carbon nanotubes and device applications. Examples of specific projects include superconductivity in reduced dimensions. We study superconducting proximity effect and Josephson effect using carbon nanotubes connected to superconducting electrodes through very thin (< 5 nm) metallic layers as nanoscale point contacts. We also investigate whether and under which conditions intrinsic superconductivity may arise in carbon nanotubes.

We study applications of carbon nanotube devices ranging from chemical sensing and its physical mechanism to detection of electromagnetic radiation, e.g. using nanotube quantum dots as THz detectors.


Selected Publications

  1. F. M. Araujo-Moreira, P. Barbara, A. B. Cawthorne, and C. J. Lobb, Reentrant AC magnetic susceptibility in Josephson-junction arrays, Phys. Rev. Lett. 78, 4625 (1997).
  2. P. Barbara, F. M. Araujo-Moreira, A. B. Cawthorne, and C. J. Lobb, Reentrant AC magnetic susceptibility in Josephson-junction arrays: An alternative explanation for the paramagnetic Meissner effect, Phys. Rev. B 60, 7489 (1999).
  3. P. Barbara, A. B. Cawthorne, S. V. Shitov and C. J. Lobb, Stimulated emission and amplification in Josephson-junction arrays, Phys. Rev. Lett. 82, 1963 (1999).
  4. A. P. Nielsen, A. B. Cawthorne, P. Barbara, F. C. Wellstood, C. J. Lobb, R. S. Newrock, and M. G. Forrester, Paramagnetic Meissner effect in multiply-connected superconductors, Phys. Rev. B 62, 1438 (2000).
  5. B. Vasilic, P. Barbara, C. J. Lobb, and S. V. Shitov, Direct observation of a threshold for coherent radiation in unshunted Josephson junction arrays with groundplanes, Phys. Rev. B 65, 18503(R) (2002).
  6. J. Zhang, A. Boyd, A. Tselev, M. Paranjape, and P. Barbara, Mechanism of NO_2 interaction in carbon nanotube field effect transistor chemical sensors, Applied Physics Letters 88, 123112 (2006).
  7. J. Zhang, A. Tselev, Y. Yang, K. Hatton, P. Barbara, and S. Shafraniuk, Zero-bias anomaly and superconductivity in single-walled carbon nanotubes, Phys. Rev. B 74, 155414 (2006).
  8. G. Fedorov, A. Tselev, D. Jimenez, S. Latil, N. Kalugin, P. Barbara, D. Smirnov, and S. Roche, Magnetically induced field effect in carbon nanotube devices, Nano Letters 7, 960 (2007).