TY - JOUR
T1 - Electronic states and cyclotron resonance in n-type InMnAs
AU - Sanders, D.
AU - Sun, Y.
AU - Kyrychenko, V.
AU - Stanton, J.
AU - Khodaparast, A.
AU - Zudov, A.
AU - Kono, J.
AU - Matsuda, H.
AU - Miura, N.
AU - Munekata, H.
PY - 2003
Y1 - 2003
N2 - We present a theory for electronic and magneto-optical properties of n-type In1-xMnxAs magnetic alloy semiconductors in a high magnetic field B‖ẑ. We use an eight-band Pidgeon-Brown model generalized to include the wave vector (kz) dependence of the electronic states as well as s-d and p-d exchange interactions with localized Mn d electrons. Calculated conduction-band Landau levels exhibit effective masses and g factors that are strongly dependent on temperature, magnetic field, Mn concentration (x), and kz. Cyclotron resonance (CR) spectra are computed using Fermi’s golden rule and compared with ultrahigh-magnetic-field (>50 T) CR experiments, which show that the electron CR peak position is sensitive to x. Detailed comparison between theory and experiment allowed us to extract the s-d and p-d exchange parameters α and β. We find that not only α but also β affects the electron mass because of the strong interband coupling in this narrow-gap semiconductor. In addition, we derive analytical expressions for effective masses and g factors within the eight-band model. Results indicates that (α-β) is the crucial parameter that determines the exchange interaction correction to the cyclotron masses. These findings should be useful for designing novel devices based on ferromagnetic semiconductors.
AB - We present a theory for electronic and magneto-optical properties of n-type In1-xMnxAs magnetic alloy semiconductors in a high magnetic field B‖ẑ. We use an eight-band Pidgeon-Brown model generalized to include the wave vector (kz) dependence of the electronic states as well as s-d and p-d exchange interactions with localized Mn d electrons. Calculated conduction-band Landau levels exhibit effective masses and g factors that are strongly dependent on temperature, magnetic field, Mn concentration (x), and kz. Cyclotron resonance (CR) spectra are computed using Fermi’s golden rule and compared with ultrahigh-magnetic-field (>50 T) CR experiments, which show that the electron CR peak position is sensitive to x. Detailed comparison between theory and experiment allowed us to extract the s-d and p-d exchange parameters α and β. We find that not only α but also β affects the electron mass because of the strong interband coupling in this narrow-gap semiconductor. In addition, we derive analytical expressions for effective masses and g factors within the eight-band model. Results indicates that (α-β) is the crucial parameter that determines the exchange interaction correction to the cyclotron masses. These findings should be useful for designing novel devices based on ferromagnetic semiconductors.
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U2 - 10.1103/PhysRevB.68.165205
DO - 10.1103/PhysRevB.68.165205
M3 - Article
AN - SCOPUS:0346801666
SN - 1098-0121
VL - 68
JO - Physical Review B - Condensed Matter and Materials Physics
JF - Physical Review B - Condensed Matter and Materials Physics
IS - 16
ER -