Research Summary:

Professor Heiman's research group focuses on several challenging and technologically important areas: (1) ferromagnetic semiconductors (e.g. GaMnAs and GaCrAs) for spintronic applications; (2) molecular beam epitaxy (MBE) crystal growth; (3) device engineering for information technology; and (4) correlated electrons in 2D - metal-insulator transition and quantum Hall effects. The group's primary experimental tools are optical measurements and spectroscopy in high magnetic fields and at low temperatures. Two magnets are available, a 9.5 T optical magnet and a 14 T cryogen-free superconducting magnet. A new 5 T SQUID magnetometer has recently been installed. Research projects and instrumentation are supported by the National Science Foundation and the University.

Recent Publications:

Y.J. Park, M. van Veenhuizen, J.S. Moodera, C.H. Perry and D. Heiman, "Generation and Detection of Spin current in GaAs with MgO Tunnel Barriers," Phys. Rev. Lett. (2007).

S.D. Yoon, Yajie Chen, D. Heiman, Aria Yang, Nian Sun, C. Vittoria, and V.G. Harris, "Room Temperature Magnetism in Semiconducting Films of ZnO Doped with Ferric Ions," J. Appl. Phys. 99, 1 (2006).

L. Zhang, D. Basiaga, J.R. O'Brien and D. Heiman, "Enhanced Ferromagnetic Phase Diagram of Epitaxial (Co,Mn) Alloys on GaAs(001)," J. Appl. Phys. 98, 106101 (2005).

P. LeClair, J.S. Moodera, J. Philip, and D. Heiman, "Coexistence of Ferromagnetism and Superconductivity in Ni/Bi Bilayers," Phys. Rev. Lett. 94, 037006 (2005).

D. Heiman, Y.J. Chen, D. Basiaga, L. Zhang, and P.G. Murugesan, "Heusler Half-Metals on GaAs for Spin Injection, Compound Semiconductors 2004," eds. J.C.Woo, et al., Inst. Phys. Conf. Ser. Num. 184 (Institute of Physics, Bristol, 2005), pp. 153-160.

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