Magnetic field tuning of the effective g factor in a diluted magnetic semiconductor quantum dot

We theoretically demonstrate that how the Rashba spin–orbit interaction induced by the external electric field can be used to manipulate spin degree of freedom of electrons in a diluted magnetic semiconductor quantum dot (DMS QD) in the presence of a weak perpendicular magnetic field. The effects of Rashba spin–orbit interaction, induced by the electrostatic potential, on the apparent total spin splitting in a diluted magnetic semiconductor quantum dot have been studied. We propose that the apparent total spin splitting is the result of electrically tunable "renormalization" of s–d exchange interaction. It could be favorably engineered to electrically tune the spin degree of freedom in the spintronic devices.

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Magnetic polarons in a single diluted magnetic semiconductor quantum dot

Physical Review B ◽

10.1103/physrevb.62.r7767 ◽

2000 ◽

Vol 62 (12) ◽

pp. R7767-R7770 ◽

Cited By ~ 125

Author(s):

A. A. Maksimov ◽

G. Bacher ◽

A. McDonald ◽

V. D. Kulakovskii ◽

A. Forchel ◽

...

Keyword(s):

Quantum Dot ◽

Diluted Magnetic Semiconductor ◽

Magnetic Semiconductor ◽

Semiconductor Quantum Dot ◽

Magnetic Polarons ◽

Diluted Magnetic

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Spin-polarized tunneling through a diluted magnetic semiconductor quantum dot

Physical Review B ◽

10.1103/physrevb.71.155309 ◽

2005 ◽

Vol 71 (15) ◽

Cited By ~ 14

Author(s):

Kai Chang ◽

K. S. Chan ◽

F. M. Peeters

Keyword(s):

Quantum Dot ◽

Diluted Magnetic Semiconductor ◽

Magnetic Semiconductor ◽

Semiconductor Quantum Dot ◽

Spin Polarized ◽

Diluted Magnetic ◽

Spin Polarized Tunneling

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CONTROLLABLE SPIN POLARIZATION IN A DMS QUANTUM DOT

Modern Physics Letters B ◽

10.1142/s0217984905009353 ◽

2005 ◽

Vol 19 (27) ◽

pp. 1419-1427 ◽

Cited By ~ 1

Author(s):

NAMMEE KIM ◽

T. W. KANG ◽

HEESANG KIM

Keyword(s):

Quantum Dot ◽

Exchange Interaction ◽

Spin Polarization ◽

Diluted Magnetic Semiconductor ◽

Magnetic Semiconductor ◽

Energy Splitting ◽

Semiconductor Quantum Dot ◽

Cyclotron Energy ◽

Diluted Magnetic ◽

Electro Magnetic

The effects of electro-magnetic confining potentials and the s–d exchange interaction between substituted Mn ions and carriers on the spin polarization of carriers in an diluted magnetic semiconductor quantum dot are investigated within the framework of the effective-mass theory. The energy eigenvalues and wavefunctions of a single electron in the presence of an external magnetic field are studied by solving the one particle Schrödinger equation including the conventional Zeeman effect, the s–d exchange interaction and the electric confining potential which describes the dot. The eigenenergy structure for low lying states is strongly dependant on the relative sizes of the s–d exchange interactions and the conventional Zeeman energy splitting. When the spin splitting exceeds the cyclotron energy splitting, the Landau level overlappings occur so that the spin polarization of carriers is induced in low lying energy states. This spin polarization of carriers in the diluted magnetic semiconductor quantum dot can be controlled by changing the electro-magnetic confining potentials.

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