Theoretical Study on Spin Alignments in Ferromagnetic Heterospin Chains with Competing Exchange Interactions:  A Generalized Ferrimagnetic System Containing Organic Biradicals in the Singlet Ground State

2005 ◽  
Vol 109 (19) ◽  
pp. 9299-9304 ◽  
Author(s):  
Kensuke Maekawa ◽  
Daisuke Shiomi ◽  
Tomoaki Ise ◽  
Kazunobu Sato ◽  
Takeji Takui
Keyword(s):  
Ground State ◽  
Theoretical Study ◽  
Exchange Interactions ◽  
Singlet Ground State

POLARON IN A QUANTUM DOT UNDER AN ELECTRIC FIELD

2007 ◽  
Vol 21 (24) ◽  
pp. 1635-1642
Author(s):  
MIAN LIU ◽  
WENDONG MA ◽  
ZIJUN LI
Keyword(s):  
Quantum Dot ◽  
Electric Field ◽  
Field Intensity ◽  
Ground State Energy ◽  
Ground State ◽  
Electric Field Intensity ◽  
State Energy ◽  
Theoretical Study ◽  
The Moment ◽  
Transformation Methods

We conducted a theoretical study on the properties of a polaron with electron-LO phonon strong-coupling in a cylindrical quantum dot under an electric field using linear combination operator and unitary transformation methods. The changing relations between the ground state energy of the polaron in the quantum dot and the electric field intensity, restricted intensity, and cylindrical height were derived. The numerical results show that the polar of the quantum dot is enlarged with increasing restricted intensity and decreasing cylindrical height, and with cylindrical height at 0 ~ 5 nm , the polar of the quantum dot is strongest. The ground state energy decreases with increasing electric field intensity, and at the moment of just adding electric field, quantum polarization is strongest.

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