Relation between exciton splittings, magnetic circular dichroism, and magnetization in wurtzite Ga_(1-x)Fe_xN
PBN-AR
Instytucja
Wydział Fizyki (Uniwersytet Warszawski)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
PHYSICAL REVIEW B
ISSN
1098-0121
EISSN
1550-235X
Wydawca
AMER PHYSICAL SOC
DOI
URL
Rok publikacji
2013
Numer zeszytu
11
Strony od-do
115208-1-7
Numer tomu
88
Identyfikator DOI
Liczba arkuszy
Słowa kluczowe
en
OPTICAL-PROPERTIES
MAGNETOOPTICAL PROPERTIES
EXCHANGE INTERACTIONS
SEMICONDUCTORS
NANOCRYSTALS
FERROMAGNETISM
SPECTROSCOPY
Streszczenia
Język
en
Treść
The question of the correlation between magnetization, band splittings, and magnetic circular dichroism (MCD) in the fundamental gap region of dilute magnetic semiconductors is examined experimentally and through model calculations, taking the case of wurtzite Ga1-xFexN as an example. Magnetization and polarization-resolved reflectivity measurements have been performed down to 2 K and up to 7 T for x = 0.2%. Optical transitions originating from all three free excitons A, B, and C, specific to the wurtzite structure, have been observed and their evolution with the magnetic field determined. It is demonstrated that the magnitude of the exciton splittings evaluated from reflectivity-MCD data can be overestimated by more than a factor of 2, as compared to the values obtained by describing the polarization-resolved reflectivity spectra with appropriate dielectric functions. A series of model calculations shows that the quantitative inaccuracy of MCD originates from a substantial influence of the magnetization-dependent exchange interactions not only on the spin splittings of excitons but also upon their linewidth and oscillator strength. At the same time, a method is proposed that allows us to evaluate the field and temperature dependencies of the magnetization from MCD spectra. The accurate values of the excitonic splittings and of the magnetization reported here substantiate the magnitudes of the apparent sp-d exchange integrals in (Ga,Fe)N previously determined.
Cechy publikacji
discipline:Fizyka
discipline:Physics
Original article
Original article presents the results of original research or experiment.
Oryginalny artykuł naukowy
Oryginalny artykuł naukowy przedstawia rezultaty oryginalnych badań naukowych lub eksperymentu.
Inne
System-identifier
PBN-R:503711
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