pg@uwm.edu

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Telephone: (414) 229-6497
Room: 418

Professor Prasenjit Guptasarma is a Condensed Matter Physicist with interests in the Materials Science of systems with Strongly Correlated electrons. People in this area of research seek to elucidate the fundamental physics of unusual electronic and magnetic properties of materials. The physics most interesting to Guptasarma and colleagues is often found near a critical phase transition bordering an unconventional quantum physical ground state. "Smart" materials, which Guptasarma's group studies, are so dubbed because of their applications in electronic devices (computers, sensors, detectors, displays, and so on).

Before joining the UWM Physics faculty in 2000, Guptasarma worked at the Argonne National Laboratory near Chicago, at the Institute for Molecular Spectroscopy in Bologna, and the Tata Institute of Fundamental Research in Bombay. He received his Ph.D. degree in Physics in 1993. Guptasarma has presented over 50 invited lectures and seminars in different parts of the US, South America, Europe and Asia. Recent recognitions of Guptasarma's research and teaching include the US National Science Foundation's CAREER award (2005), the Research Committee award (2005), UWM's RGI award (2006), the WSGC-NASA's Research Infrastructure award (2006) and appointment as Wisconsin Teaching Scholar (2007). For a brief resume, click here.

At UWM, Guptasarma directs a research group of graduate and postdoctoral physicists and chemists supported by extramural research grants. Many undergraduate students, as well as high-school teachers and students, routinely participate in the group's research activities. High school teachers are supported through NSF-RET, and undergraduates through UROP, AAF, NSF-REU and other sources. Current activities are in the areas of superconductivity and magnetism, with an emphasis on magnetoelectric multiferroics. Other projects include growth of nano-structured oxide materials; magnetic, ultrasound and specific heat properties of superconductors and magnetoelectrics (300mK-800K); crystal structure in bulk- and nano- single crystals, and physical property relationships. Guptasarma's research lab hosts equipment for floating-zone growth of high-purity bulk single crystals, growth of nanostructures using high-pressure and solution-based techniques such as sol-gel, measurement of physical properties at low temperatures (300mK ­ 800K in fields of up to 9 Tesla). An array of advanced materials characterization tools is available at campus facilities such as the Advanced Analysis Facility, high resolution electron microscope facilities. The group also performs research at national facilities such as synchrotron beamlines, neutron beamlines, and high-field magnets. Students and postdocs travel to international workshops, actively participate in national and international collaborations with research laboratories and local industries. They also travel to international research conferences and workshops.

Guptasarma enjoys teaching at both undergraduate and graduate levels. Click here to find a list of classes taught by Guptasarma, along with student evaluation scores. Guptasarma's other research interests in Physics education, including studies of how different teaching practices affect student learning, are supported by the UW system and the CIPD. Guptasarma was a UWM scholar of teaching and learning in 2005-06 and Wisconsin Teaching Scholar in 2007-08.

Guptasarma's active hobbies include classical music and foreign languages.

Selected Research Publication Titles (see CV for full list)

1. “Two dimensional vortices in Superconductors,” Nature Physics, accepted (2007).

2. “Floating Zone Growth and Carrier Relaxation Dynamics in Single Crystals of Sr₂RuO₄ near the Clean Limit,” J. Phys. Chem. Solids 67, 525 (2006).

3. “Gap-like excitations in the superconducting state of Bi₂Sr₂CaCu₂O₈ Studied by Resonant Raman Scattering,” Phys. Rev. Lett. 95, 057003 (2005).

4. “Measuring the Josephson plasma resonance in Bi₂Sr₂CaCu₂O₈ using intense coherent THz synchrotron radiation,” Phys. Rev. B 69, 092512 (2004).

5. “Carrier relaxation time divergence in single and double layer cuprates,” Eur. Phys. J. B 36, 327-334 (2003).

6. “Superconductivity-induced optical changes for energies of 100  in the cuprates,” Phys. Rev. B 63, 4514, n.224514 (2001).

7. “Predominantly Superconducting Origin of Large Energy Gaps in underdoped Bi₂Sr₂CaCu₂O₈ from Tunneling Spectroscopy,” Phys. Rev. Lett. 83 (5) 1018 (1999).

8. “Doping Dependence of Electronic Interactions in Cuprate Superconductors–doped Antiferromagnets or Antiferromagnetic Fermi liquids?,” Phys. Rev. Lett. 82 (26) 5249 (1999).

9. “Electronic Spectra and their Relation to the (pi,pi) collective mode in High Tc Superconductors,” Phys. Rev. Lett. 83 (18) 3709 (1999).

10. “c-axis Electronic Raman in Bi₂Sr₂CaCu₂O₈ ,” Phys. Rev. Lett. 82 (17) 3524 (1999).

11. “Unusual Strong-Coupling Effects in the Tunneling Spectroscopy of Optimally doped and Overdoped Bi₂Sr₂aCu₂O_8+x,” Phys. Rev. Lett. 80 (1) 153 (1998).

12. “Strong Dependence of the Superconducting Gap on Oxygen Doping from Tunneling Measurements on Bi₂Sr₂CaCu₂O₈,” Phys. Rev. Lett. 80 (1) 157 (1998).

13. “Gradual Appearance of the Fermi surface in the Pseudogap State of High Tc Superconductors,” Nature 392 157 (also see Nature News & Views, p. 134) (1998).