|Infrared Nano-Optics of Quantum Materials|
Magnetic semiconductors have received a great deal of interest due to their potential application in spintronics devices, which could have control over both spin and electronic degrees of freedom. These systems also reveal fascinating physics due to the interplay between electronic, magnetic and structural properties. Extensive studies of the electronic structure and carrier dynamics in III-V ferromagnetic semiconductors have been carried out in our group in collaboration with the group of David Awschalom (UCSB). Current and future projects are aimed at the effects of tuning carrier density and disorder in these systems. This work is supported by ONR.
B. C. Chapler, S. Mack, R. C. Myers, A. Frenzel, B. C. Pursley, K. S. Burch, A. M. Dattelbaum, N. Samarth, D. D. Awschalom, and D. N. Basov. "Ferromagnetism and infrared electrodynamics of Ga1-xMnxAs" Phys. Rev. B 87, 205314 (2013). LINK
B. C. Chapler, S. Mack, L. Ju, T. W. Elson, B. W. Boudouris, E. Namdas, J. D. Yuen, A. J. Heeger, N. Samarth, M. Di Ventra, R. A. Segalman, D. D. Awschalom, F. Wang, and D. N. Basov. "Infrared conductivity of hole accumulation and depletion layers in (Ga,Mn)As- and (Ga,Be)As-based electric field-effect devices" Phys. Rev. B 86, 165302 (2012). LINK
B. C. Chapler, R. C. Myers, S. Mack, A. Frenzel, B. C. Pursley, K. S. Burch, E. J. Singley, A. M. Dattelbaum, N. Samarth, D. D. Awschalom, and D. N. Basov “Infrared probe of the insulator-to-metal transition in Ga1-xMnxAs and Ga1-xBexAs” Phys. Rev. B 84, 081203(R) (2011). PDF
K. S. Burch, D. D. Awschalom, D. N. Basov, "Optical properties of III-Mn-V ferromagnetic semiconductors", Journal of Magnetism and Magnetic Materials 320, 3207 (2008) PDF
K.S. Burch, D. B. Shrekenhamer, E. J. Singley, J. Stephens, B. L. Sheu, R. K. Kawakami, P. Schiffer, N. Samarth, D. D. Awschalom, and D. N. Basov, "Impurity band conduction in a high temperature ferromagnetic semiconductor", Phys. Rev. Lett. 97, 087208 (2006) PDF
K. S. Burch, E. J. Singley, J. Stephens, R. K. Kawakami, D. D. Awschalom, and D. N. Basov, “Infrared survey of the carrier dynamics in III-V digital ferromagnetic heterostructures”, Phys. Rev. B 71, 125346 (2005) PDF