scholarly journals Ferromagnetism in Diluted Magnetic Semiconductor (Ga,Mn)As Quantum Wires and Quantum Wells under the Influence of Photo-Excitation and Spin Wave Scattering

2013 ◽  
Vol 04 (12) ◽  
pp. 1563-1568 ◽  
Author(s):  
Chernet Amente ◽  
Keya Dharamvir
Keyword(s):  
Quantum Wells ◽  
Spin Wave ◽  
Wave Scattering ◽  
Quantum Wires ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Diluted Magnetic

EFFECTS OF PHOTO-EXCITATION AND MAGNON SCATTERING ON FERROMAGNETIC TRANSITION TEMPERATURE OF THE DILUTED MAGNETIC SEMICONDUCTOR (Ga1 - x, Mnx)As

2011 ◽  
Vol 25 (04) ◽  
pp. 273-280 ◽  
Author(s):  
CHERNET AMENTE ◽  
P. SINGH
Keyword(s):  
Transition Temperature ◽  
Spin Wave ◽  
Wave Scattering ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Ferromagnetic Transition ◽  
Photon Irradiation ◽  
Model Hamiltonian ◽  
Diluted Magnetic ◽  
System Properties

Effects of photo-excitation and spin-wave scattering on magnetization of the diluted magnetic semiconductor (DMS) ( Ga , Mn ) As are theoretically studied. Green function formalism is used to find expression for magnetization and ferromagnetic transition temperature TC starting with a model Hamiltonian consisting of magnons, photons and an interaction of magnons with photons. According to our calculation, there is TC in the absence of magnetic impurity, x = 0, indicating that there could be electronically unpaired influential carriers/holes induced by photon irradiation resulting in residual itinerant band magnetization which can be revealed by experiments. Unusual upturn in magnetization near 0 K temperature values for larger magnon–photon coupling constant is also indicated. Moreover, enhancement of magnetization is established with increase in impurity concentration and even further in the presence of photon–magnon coupling which however decreases due to spin-wave scattering. This leads to the conclusion that at lower temperatures photon irradiation and at higher temperatures spin-wave scattering could affect the system properties predominantly.

The distinct behavior of specific heat of diluted magnetic semiconductor (Ga,Mn)As quantum wells

2015 ◽  
Vol 15 ◽  
pp. S26-S29 ◽  
Author(s):  
Hee Chang Jeon ◽  
Mingkai Li ◽  
Seung Joo Lee ◽  
Gukhyung Ihm ◽  
Tae Won Kang ◽  
...  
Keyword(s):  
Specific Heat ◽  
Quantum Wells ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Diluted Magnetic

Spin-Conserving Tunneling of Excitons in Diluted Magnetic Semiconductor Double Quantum Wells

2008 ◽  
Vol 47 (5) ◽  
pp. 3533-3536 ◽  
Author(s):  
Jiho Park ◽  
Akihiro Murayama ◽  
Izuru Souma ◽  
Yasuo Oka ◽  
Daniel Dangnelund ◽  
...  
Keyword(s):  
Quantum Wells ◽  
Diluted Magnetic Semiconductor ◽  
Magnetic Semiconductor ◽  
Double Quantum ◽  
Diluted Magnetic

Ultrafast spin dynamics in diluted magnetic semiconductor quantum wells

1998 ◽  
Vol 184-185 ◽  
pp. 931-935 ◽  
Author(s):  
R. Akimoto ◽  
K. Ando ◽  
F. Sasaki ◽  
S. Kobayashi ◽  
T. Tani
Keyword(s):  
Quantum Wells ◽  
Diluted Magnetic Semiconductor ◽  
Spin Dynamics ◽  
Magnetic Semiconductor ◽  
Semiconductor Quantum Wells ◽  
Diluted Magnetic
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