Roberto C. Ramos, PhD

Roberto Ramos

Roberto C. Ramos PhD

Director, Center for Undergraduate Research

Associate Professor of Physics

Education

BS Physics, cum laude (University of the Philippines)
MS Physics, (University of Washington)
PhD (University of Washington)
Postdoc in Superconducting Quantum Computing, Center for Superconductivity Research, University of Maryland

Research Interests

Ultra-low Temperature Physics, Quantum Fluids, Novel and Applied Superconductivity, Quantum Information, Nanotechnology, Experimental Condensed Matter, Physics Education

Active research work in Dr. Ramos's research group include the measurements of multiple-photon transitions, resonant activation and macroscopic quantum tunneling in Josephson junctions made with multi-gap superconductors (MgB2 and iron pnictides), confirmation of sub-structure in the superconducting energy gap of MgB2, Fabry-Perot interferometry in nanoscale graphene junctions, and quantum-classical crossover in Josephson junctions. He and colleagues at the University of Maryland were the first to propose the concept of the Josephson phase qubit, and were the first to couple Josephson phase qubits and measure spectroscopic evidence of entanglement. His graduate work with Oscar Vilches at the University of Washington led to the first mapping of the liquid-vapor coexistence curve in single-atomic layers of He3-He4 mixtures. In the area of physics education, he conducts research and workshops on flipping physics classes, and applying the iPAD for video-motion analysis and as an oscilloscope in introductory physics laboratories.

Synopsis

Dr. Ramos is an experimental quantum mechanic and ultra-low temperature physicist who probes the quantum properties of materials and devices. He is published in top scientific journals including Science, Nature Communications, Physical Review, and Journal of Applied Physics. He has been awarded over $1.3M in research and education grants from the National Science Foundation and DOE research equipment valued at over $700,000. He was Program Director of two NSF S-STEM Scholarship Programs, at Drexel University and Indiana Wesleyan University, where he was Blanchard Endowed Research Chair, a Hinds Fellow, and two-time Principium Lecture Awardee. He received Drexel's Allan-Rothwarf Award for Excellence in Teaching and the Bright Idea Award at USciences. He has planted and nurtured award-winning chapters of the Society of Physics Students across three universities, was nominated twice as Outstanding SPS Advisor, and was research mentor to multiple Goldwater Scholars. He serves as Director of USciences Center for Undergraduate Research. He is an advocate of "women in STEM" and has organized four "Physics Wonder Girls Camp" for middle school girls, featured by Philadelphia's ABC News Network on their Nightly News.

Prior Positions

Blanchard Endowed Chair of Physics & Mathematics, Associate Professor of Physics, and Director of NSF-IWU S-STEM Scholarship Program, Indiana Wesleyan University (IWU)

Assistant Professor of Physics and Director of NSF-Drexel University S-STEM Scholarship Program, Drexel University

Post-Doctoral Fellow in Superconducting Quantum Computing, Center for Superconductivity Research, University of Maryland (College Park)

Selected Scholarly Activity

"Microwave Resonant Activation in Hybrid Single-gap/Two-gap Josephson Tunnel Junctions", S.Carabello, J. G. Lambert, J. Mlack, W. Dai, Q. Li, K. Chen, D. Cunnane, X. X. Xi and R. C. Ramos, J. Appl. Phys. 120, 123904 (2016)

“Energy Gap Substructures in Conductance Measurements of MgB2-based Josephson Junctions: Beyond the 2-Gap Model” , S. Carabello, J. Lambert, J. Mlack, W. Dai, Q. Li, K. Chen, D. Cunnane, X. X. Xi, and R. C. Ramos, Supercond. Sci. Technol. 28 (2015) 055015.

“Momentum-dependent multiple gaps of MgB2 probed by electron tunneling spectroscopy on MgB2/native oxide/Pb junctions”, K. Chen, W. Dai, C.G. Zhuang, Q. Li, S. Carabello, J. Lambert, J. Mlack, R. C. Ramos and X. X. Xi, Nat. Commun. 3 : 619 doi: 10.1038/ncomms1626 (2012).

“Differential Conductance Measurements of MgB2-based Josephson junctions below 1 Kelvin”, S. Carabello, J. Lambert, J. Mlack and R.C. Ramos, IEEE Trans. in Appl. Supercond. 21 (3), pp. 3083-3085.(2011).

“Analysis of Possible Quantum Metastable States in Ballistic Graphene-based Josephson junctions”, J. Lambert, S. C. Carabello, and R. C. Ramos,  IEEE Trans. in Appl. Supercond. 21 (3), pp. 734-737 (2011).

“Decoherence in dc SQUID phase qubits,” H. Paik, S. K. Dutta, R. M. Lewis, T. A. Palomaki, B. K. Cooper, R. C. Ramos, H. Xu, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, Phys. Rev. B 77, 214510-1 through 214510-6 (2008).

“Initializing the flux state of multiwell inductively isolated Josephson junction qubits," T. A. Palomaki, S. K. Dutta, H. Paik, H. Xu, J. Matthews, R. M. Lewis, R. C. Ramos, K. Mitra, P. R. Johnson, F. W. Strauch, A. J. Dragt, C. J. Lobb, J. R. Anderson, and F. C. Wellstood, Phys. Rev. B 73, 014520 (2006).

“Spectroscopic Resonance Broadening in a Josephson Junction Qubit due to Current Noise”, H. Xu, A. J. Berkley, R. C. Ramos, M. A. Gubrud, P. R. Johnson, F. W. Strauch, A. J. Dragt, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, Phys. Rev. B Vol.71, 064512 (2005).

“Spectroscopy of Multi-particle Entanglement in a Macroscopic Superconducting Circuit”, Huizhong Xu, Frederick W. Strauch, S. K. Dutta, Philip R. Johnson, R. C. Ramos, A. J. Berkley, H. Paik, J. R. Anderson, A. J. Dragt, C. J. Lobb, and F. C. Wellstood, Phys. Rev. Lett., 94 027003 (2005).

 “Capacitively-coupled Josephson Junctions: a Two-Qubit System”, R. C. Ramos, F. W. Strauch, P. R. Johnson , A. J. Berkley, H. Xu, M. A. Gubrud, J. R. Anderson, C. J. Lobb, A. J. Dragt and F. C. Wellstood, IEEE Trans. on Appl. Supercond. 13, 994(2003).

“Entangled Macroscopic Quantum States in Two Superconducting Qubits”, A. J. Berkley, H. Xu, R. C. Ramos, M. A. Gubrud, F. W. Strauch, P. R. Johnson, J. R. Anderson, A. J. Dragt, C. J. Lobb, and F. Wellstood, Science 300, 1548 (2003).

“Design for Effective Thermalization of Junctions for Quantum Coherence”. R. C. Ramos, M. A. Gubrud, A. J. Berkley, J. R. Anderson, C. J. Lobb, and F. C. Wellstood, IEEE Trans. On Appl. Supercond., vol. 11, pp. 998–1001 (2001).

“Calorimetric Study of the Desorption and Phases of 3He and 4He adsorbed on two layers of H2-plated graphite above 0.2K”. R.C. Ramos,  P. Ebey and O.E. Vilches,  J. Low Temp Phys.  Vol 110, No.1/2 , p. 615-20 (1998).

“Liquid-Vapor Coexistence in Two-dimensional 3He-4He Mixtures”. R.C. Ramos, Jr. and O.E. Vilches,  J. Low Temp Phys  Vol. 113, No. 5/6, pp. 981-986 (1998).

“Path Integral Formulation of Ring-Shaped Topological Defects”. R. C. Ramos, Jr., C. Bernido and M. Carpio-Bernido, J. Phys A Vol 27 No. 24  p 8251-67 (1997).

Contact Information

Office location: McNeil STC, Room 243
Mailing address: Box 64
University of Sciences
600 South 43rd Street
Philadelphia, PA 19104-4495
Office Phone: 215-596-8546
Office Fax: 215-895-1112
Email:

r [dot] ramos [at] usciences [dot] edu