Cyclotron resonance of a magnetic quantum dot

Nguyen, Nga T. T.; Peeters, F. M.

doi:10.1103/physrevb.78.245311

Cited by 28 publications

(34 citation statements)

References 28 publications

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“…[11][12][13][14][15][16][17][18] There have been several investigations in the past few years on the heat capacity and entropy of quantum dots and other related low-dimensional systems in the presence of a magnetic field. [19][20][21][22][23][24][25][26][27] However, most of these investigations have used either a square well model (SQM) or a parabolic potential model (PPM) for the confining potential. Nguyen and Peeters 19 have investigated the thermodynamic quantities such as the heat capacity, the magnetization and susceptibility in the presence of a single magnetic ion and a perpendicular magnetic field taking into account the electron-electron correlations in a many-electron quantum dot.…”

Section: Introductionmentioning

confidence: 99%

“…[19][20][21][22][23][24][25][26][27] However, most of these investigations have used either a square well model (SQM) or a parabolic potential model (PPM) for the confining potential. Nguyen and Peeters 19 have investigated the thermodynamic quantities such as the heat capacity, the magnetization and susceptibility in the presence of a single magnetic ion and a perpendicular magnetic field taking into account the electron-electron correlations in a many-electron quantum dot. They have observed that the cusps in the energy levels show up as peaks in the heat capacity and the susceptibility.…”

Section: Introductionmentioning

confidence: 99%

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Heat capacity and entropy of a GaAs quantum dot with Gaussian confinement

Boyacıoğlu¹,

Chatterjee²

2012

Journal of Applied Physics

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The heat capacity and entropy effects in a GaAs quantum dot with Gaussian confinement are calculated in the presence of a magnetic field and its interaction with the electron spin using the canonical ensemble approach. It is shown that the heat capacity shows a Schottky-like anomaly at a low temperature, while it approaches a saturation value 2k B as the temperature increases. As a function of the magnetic field, the heat capacity shows a maximum and then reduces to zero. Also the width of the maximum becomes wider with temperature. It is also shown that the heat capacity remains constant up to a certain value of the confinement length beyond which it displays a monotonic increase. However as a function of the confinement strength, though the heat capacity initially shows a significant drop, it remains constant thereafter. At low temperatures like T ¼ 10 and 20 K, the entropy is found to decrease with increasing magnetic field, but at higher temperatures, it remains almost independent of the magnetic field. At high temperatures, entropy shows a monotonic increase with temperature, but at a sufficiently low temperature as the magnetic field decreases, the entropy is found to develop a shoulder which becomes more and more pronounced with decreasing magnetic field. V C 2012 American Institute of Physics.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Heat capacity and entropy of a GaAs quantum dot with Gaussian confinement

Boyacıoğlu¹,

Chatterjee²

2012

Journal of Applied Physics

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“…[52][53][54][55][56][57][58][59] Analogous to our considerations of changing magnetization at a constant total carrier density, in magnetic quantum dots it may also be possible to realize gate-controlled change of magnetization at a fixed number of carriers.…”

Section: -20mentioning

confidence: 99%

Electrical control of magnetic quantum wells: Monte Carlo simulations

et al. 2011

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We use Monte Carlo simulations to analyze electric-field control of Curie temperature TC for carrier-mediated ferromagnetism in semiconductors. Gating employed to achieve electrostatic doping in optimized geometry of (Ga,Mn)As, a prototypical ferromagnetic semiconductor, reveals a highly-tunable ferromagnetic order. We show the feasibility of ∆TC > 100 K, an order of magnitude greater then the state-of-the-art measurements, at fields substantially smaller then the breakdown values. Such controllable ferromagnetism may help elucidate the mechanism of carrier-mediated magnetism in various semiconductors and offer versatile spintronic applications.

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“…Exploration of single magnetic spins in semiconductor QDs was pioneered in (II,Mn)-VI systems where the magnetic atoms are isoelectronic Mn 2+ ions with spin 5/2 (see e.g. [4,5,6…”

Section: Introductionmentioning

confidence: 99%

Spin interactions in a quantum dot containing a magnetic impurity

Manaselyan

Chakraborty

2010

Nanotechnology

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Abstract. The electron and hole states in a CdTe quantum dot containing a single magnetic impurity in an external magnetic field are investigated, using the multiband approximation which includes the heavy hole-light hole coupling effects. The electronhole spin interactions and s,p-d interactions between the electron, the hole and the magnetic impurity are also included. The exciton energy levels and optical transitions are evaluated using the exact diagonalization scheme. A novel mechanism is proposed here to manipulate impurity-spin in the quantum dot which allows us to drive selectively the spin of the magnetic atom into each of its six possible orientations.

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Cyclotron resonance of a magnetic quantum dot

Cited by 28 publications

References 28 publications

Heat capacity and entropy of a GaAs quantum dot with Gaussian confinement

Heat capacity and entropy of a GaAs quantum dot with Gaussian confinement

Electrical control of magnetic quantum wells: Monte Carlo simulations

Spin interactions in a quantum dot containing a magnetic impurity

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