Positively charged donor exciton binding energy is computed as a function of quantum-dot size within the single band effective mass approximation for different Mn contents in Cd_(1)−x_(𝑥in)Mn_(x𝑥in)Te/...Positively charged donor exciton binding energy is computed as a function of quantum-dot size within the single band effective mass approximation for different Mn contents in Cd_(1)−x_(𝑥in)Mn_(x𝑥in)Te/Cd_(1−xout)𝑥outMn_(xout)𝑥outTe.The exciton bound polaron is computed for 0≤x𝑥≤0.08,on the Mn mole fraction.We determine the energy gap using the mean field approximation and incorporate the exchange interaction between the carrier and the magnetic impurity.The interband emission energy is studied with the height and radius of the cylindrical quantum dot.Valence-band anisotropy is included in our theoretical model using different hole masses in different spatial directions.Spin polaronic shifts as functions of quantum-dot radius and Mn concentration are estimated using the mean field theory.It is found that(i)the energy gap depends on the Mn mole fraction,(ii)it increases linearly with an increase in Mn content,and(iii)the effect is more pronounced for a narrow dot,showing the quantum size effects.Our results are in good agreement with other recently published reports.展开更多
基金The corresponding author(AJP)thanks the CSIR,India under Grant No 03(1159)/10/EMR-II for the financial support of this work.
文摘Positively charged donor exciton binding energy is computed as a function of quantum-dot size within the single band effective mass approximation for different Mn contents in Cd_(1)−x_(𝑥in)Mn_(x𝑥in)Te/Cd_(1−xout)𝑥outMn_(xout)𝑥outTe.The exciton bound polaron is computed for 0≤x𝑥≤0.08,on the Mn mole fraction.We determine the energy gap using the mean field approximation and incorporate the exchange interaction between the carrier and the magnetic impurity.The interband emission energy is studied with the height and radius of the cylindrical quantum dot.Valence-band anisotropy is included in our theoretical model using different hole masses in different spatial directions.Spin polaronic shifts as functions of quantum-dot radius and Mn concentration are estimated using the mean field theory.It is found that(i)the energy gap depends on the Mn mole fraction,(ii)it increases linearly with an increase in Mn content,and(iii)the effect is more pronounced for a narrow dot,showing the quantum size effects.Our results are in good agreement with other recently published reports.
