Steven T. Ruggiero

Professor,
Condensed Matter Physics

Research Interests

The research in Prof. Ruggiero's group involves the material and transport properties of new thin-film materials. This includes superconductors, ferromagnets, and organic systems. Techniques employed include atomic-force and scanning tunneling microscopy. Experiments are typically conducted at high magnetic fields and/or low temperatures (down to 60 mK).

Work has recently included the study of spin injection across ferromagnetic/semiconductor interfaces and intrinsic magneto-optic effects in ferromagnetic films. Also studied are dilutely doped superconductors and the effect of resonant scattering defects on the superconducting density of states.

Most recently, work has begun on graphene systems. Specifically the group is exploring tunneling in normal/graphene/superconducting systems to study the Dirac nature of carriers in graphene systems.

Selected Publications:

"Observation of Nonmagnetic Resonant Scattering Effects by Tunneling in Dilute Al-Mn Alloy Superconductors," G. O'Neil, D. Schmidt, N.A. Miller, J.N. Ullom, A. Williams, G.B. Arnold, and S.T. Ruggiero, Phys. Rev. Lett. 100, 056804, 14 (2008).

"Practical Tunneling Refrigerator," A.M. Clark, A. Williams, S.T. Ruggiero, M.L. van den Berg, J.N. Ullom, Appl. Phys. Lett. 84, 625-7 (2004).

"Magneto-optic Effects in Spin-injection Devices," S.T. Ruggiero, T. Williams, C.E. Tanner, S. Potashnik, J. Moreland, and W.H. Rippard, Appl. Phys. Lett. 82, 4599-4601 (2003).

"Superconducting Devices," (Book) S.T. Ruggiero and D.A. Rudman, Eds. (Academic, New York, 1990).

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