UCR

Department of Physics & Astronomy



Roland Kawakami


Roland Kawakami

Roland Kawakami

Professor of Physics

Office:
Physics 3034

Telephone: 951-827-5343
Email: roland.kawakami@ucr.edu
Fax: 951-827-4529
Lab: 951-827-7141

Kawakami Group Home Page

Research Interests:

  • Experimental Condensed Matter Physics

Education:

Ph.D. 1999, University of California, Berkeley

Current Research:

A central theme of our research is to understand the behavior of electron spin in nanoscale structures and its relation to magnetic and opto-electronic properties. At the nanometer length scale quantum effects and interfacial phenomena dominate, leading to behavior not seen in bulk materials. Our work focuses on synthesizing novel heterostructures and devices consisting of magnetic, semiconducting, and organic materials, and exploring the new physics which emerge in these systems. The development of electronic devices that utilize the electron spin has come to be known as "spintronics," and there is a strong potential for applications in magnetic information storage, reconfigurable logic, magnetic field sensors, and their integration with display and communication technologies. The new heterostructures and materials developed in our laboratory might also become important for spin-based quantum information systems.

Molecular beam epitaxy (MBE) provides a means for synthesizing thin film heterostructures in an atom-by-atom manner (or molecule-by-molecule) for the best possible control over the material and interface structure. In situ scanning tunneling microscopy (STM) provides atomic-scale structural characterization, while in situ optics (including ultrafast optics and magneto-optics) investigates the dynamics of spin, magnetism, and light emission in these heterostructures. Combining these techniques with lithographically-defined templates enables electronic devices to be fabricated under the same high-quality MBE growth conditions, and specially-made sample holders allow the devices to be tested in situ; this avoids the potentially damaging effects of air. This new approach to fabricating and testing devices is being used to develop spintronic devices as well as charge-based optoelectronic devices.

Specific materials of interest include ferromagnetic metals, ferromagnetic semiconductors, organic semiconductors, and carbon nanotubes. Combinations of these materials are expected to yield new physical phenomena that do not exist in the individual materials and thus form a major part of our research. In addition, the development of half-metallic ferromagnets with high spin polarization at room temperature is recognized as one of the most important challenges for spintronic technologies and is part of our long term objectives.

Awards:

NSF CAREER Award (2005)

Selected Publications:

  1. R. K. Kawakami, Y. Kato, M. Hanson, I. Malajovich, J. M. Stephens, E. Johnston-Halperin, G. Salis, A. C. Gossard, and D. D. Awschalom, "Ferromagnetic Imprinting of Nuclear Spins in Semiconductors," Science, 294, 131 (2001).
  2. R. K. Kawakami, E. Johnston-Halperin, L. F. Chen, M. Hanson, N. G├╝bels, J. S. Speck, A. C. Gossard, and D. D. Awschalom, "(Ga,Mn)As as a Digital Ferromagnetic Heterostructure," Appl. Phys. Lett. 77, 2379 (2000).
  3. R. K. Kawakami, E. Rotenberg, Hyuk J. Choi, Ernesto J. Escorcia-Aparicio, M. O. Bowen, J. H. Wolfe, E. Arenholz, Z. Zhang, N. V. Smith, and Z. Q. Qiu, "Quantum Well States of Cu Thin Films," Nature 398, 132 (1999).
  4. R. K. Kawakami, E. Rotenberg, Ernesto J. Escorcia-Aparicio, Hyuk J. Choi, T. R. Cummins, J. G. Tobin, N. V. Smith, and Z. Q. Qiu, "Observation of the Quantum Well Interference in Magnetic Nanostructures by Photoemission," Phys. Rev. Lett. 80, 1754 (1998).
  5. R. K. Kawakami, Ernesto J. Escorcia-Aparicio and Z. Q. Qiu, "Symmetry-Induced Magnetic Anisotropy in Fe Films Grown on Stepped Ag(001)," Phys. Rev. Lett. 77, 2570 (1996).

More Information

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University of California, Riverside
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Tel: (951) 827-1012

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Main Office Tel: (951) 827-5331
Main Office Fax: (951) 827-4529
Maynard, Bonnie; Chair's Assistant, Academic Personnel
E-mail: bonnie.maynard@ucr.edu

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