Electronic structure of (Ga,Mn)As revisited
(2017) In New Journal of Physics 19(2).- Abstract
- The detailed nature of electronic states mediating ferromagnetic coupling in dilute magnetic semiconductors, specifically (Ga,Mn)As, has been an issue of long debate. Two confronting models have been discussed emphasizing host band versus impurity band carriers. Using angle resolved photoemission we show that the electronic structure of the (Ga,Mn)As system is significantly modified from that of GaAs throughout the valence band. Close to the Fermi energy, the presence of Mn induces a strong mixing of the bulk bands of GaAs, which results in the appearance of a highly dispersive band in the gap region of GaAs. For Mn concentrations above1%the band reaches the Fermi level, and can
thus host the delocalized holes needed for ferromagnetic... (More) - The detailed nature of electronic states mediating ferromagnetic coupling in dilute magnetic semiconductors, specifically (Ga,Mn)As, has been an issue of long debate. Two confronting models have been discussed emphasizing host band versus impurity band carriers. Using angle resolved photoemission we show that the electronic structure of the (Ga,Mn)As system is significantly modified from that of GaAs throughout the valence band. Close to the Fermi energy, the presence of Mn induces a strong mixing of the bulk bands of GaAs, which results in the appearance of a highly dispersive band in the gap region of GaAs. For Mn concentrations above1%the band reaches the Fermi level, and can
thus host the delocalized holes needed for ferromagnetic coupling. Overall, our data provide a firm evidence of delocalized carriers belonging to the modified host valence band. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/a67cbbeb-41a4-4041-be51-03456ffd84e5
- author
- Kanski, Janusz ; Ilver, Lars ; Karlsson, Krister ; Ulfat, Intikhab LU ; Leandersson, Mats LU ; Sadowski, Janusz LU and Di Marco, I.
- organization
- publishing date
- 2017-02-02
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- dilute magnetic semiconductors, band structure, magnetic coupling
- in
- New Journal of Physics
- volume
- 19
- issue
- 2
- article number
- 023006
- pages
- 8 pages
- publisher
- IOP Publishing
- external identifiers
-
- scopus:85014392815
- wos:000405916900002
- ISSN
- 1367-2630
- DOI
- 10.1088/1367-2630/aa5a42
- language
- English
- LU publication?
- yes
- id
- a67cbbeb-41a4-4041-be51-03456ffd84e5
- date added to LUP
- 2017-02-03 14:34:49
- date last changed
- 2022-04-24 21:22:55
@article{a67cbbeb-41a4-4041-be51-03456ffd84e5, abstract = {{The detailed nature of electronic states mediating ferromagnetic coupling in dilute magnetic semiconductors, specifically (Ga,Mn)As, has been an issue of long debate. Two confronting models have been discussed emphasizing host band versus impurity band carriers. Using angle resolved photoemission we show that the electronic structure of the (Ga,Mn)As system is significantly modified from that of GaAs throughout the valence band. Close to the Fermi energy, the presence of Mn induces a strong mixing of the bulk bands of GaAs, which results in the appearance of a highly dispersive band in the gap region of GaAs. For Mn concentrations above1%the band reaches the Fermi level, and can<br/>thus host the delocalized holes needed for ferromagnetic coupling. Overall, our data provide a firm evidence of delocalized carriers belonging to the modified host valence band.}}, author = {{Kanski, Janusz and Ilver, Lars and Karlsson, Krister and Ulfat, Intikhab and Leandersson, Mats and Sadowski, Janusz and Di Marco, I.}}, issn = {{1367-2630}}, keywords = {{dilute magnetic semiconductors, band structure, magnetic coupling}}, language = {{eng}}, month = {{02}}, number = {{2}}, publisher = {{IOP Publishing}}, series = {{New Journal of Physics}}, title = {{Electronic structure of (Ga,Mn)As revisited}}, url = {{http://dx.doi.org/10.1088/1367-2630/aa5a42}}, doi = {{10.1088/1367-2630/aa5a42}}, volume = {{19}}, year = {{2017}}, }