scholarly journals Transport properties of diluted magnetic semiconductors: Dynamical mean-field theory and Boltzmann theory

2005 ◽  
Vol 72 (3) ◽  
Author(s):  
E. H. Hwang ◽  
S. Das Sarma
Keyword(s):  
Field Theory ◽  
Transport Properties ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Mean Field Theory ◽  
Mean Field ◽  
Dynamical Mean Field Theory ◽  
Diluted Magnetic

scholarly journals TRANSPORT PROPERTIES IN A SIMPLIFIED DOUBLE-EXCHANGE MODEL

2003 ◽  
Vol 17 (01) ◽  
pp. 39-47 ◽  
Author(s):  
VAN-NHAM PHAN ◽  
MINH-TIEN TRAN
Keyword(s):  
Field Theory ◽  
Thermal Conductivity ◽  
Transport Properties ◽  
Thermal Power ◽  
Mean Field Theory ◽  
Mean Field ◽  
Double Exchange ◽  
Exchange Model ◽  
Dynamical Mean Field Theory ◽  
Itinerant Electron

Transport properties of the manganites by the double-exchange mechanism are considered. The system is modeled by a simplified double-exchange model, i.e. the Hund coupling of the itinerant electron spins and local spins is simplified to the Ising-type one. The transport quantities such as the electronic resistivity, the thermal conductivity, and the thermal power are calculated by using the dynamical mean-field theory. The transport quantities obtained qualitatively reproduce the ones observed in the manganites. The results suggest that the simplified double exchange model underlies the key properties of the manganites.

SPIN POLARON IN A QUANTUM DOT OF THE DILUTED MAGNETIC SEMICONDUCTORS

2004 ◽  
Vol 18 (10) ◽  
pp. 419-426 ◽  
Author(s):  
K. GNANASEKAR ◽  
K. NAVANEETHAKRISHNAN
Keyword(s):  
Quantum Dot ◽  
Ionization Energy ◽  
Diluted Magnetic Semiconductors ◽  
Magnetic Semiconductors ◽  
Mean Field Theory ◽  
Mean Field ◽  
Spin Polaron ◽  
Quantum Well Wire ◽  
Theoretical Investigations ◽  
Diluted Magnetic

Theoretical investigations of spin polaron in a quantum dot in the "spin doping" superlattice systems Cd 1 - X in Mn X in Te/Cd 1 - X out Mn X out Te are presented. We estimated the donor ionization energy by variational technique and the spin polaronic shift using the mean field theory with modified Brillouin function. Our results show that significant enhancement of donor ionization energy and spin polaronic shift occur in a dot when compared to a quantum well, wire and bulk systems.

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