Magnetic field dependence of the many-electron states in a magnetic quantum dot: The ferromagnetic-antiferromagnetic transition

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

doi:10.1103/physrevb.78.045321

Cited by 43 publications

(13 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The electron and hole ground states are both located at the central region of the QDs 26–28 , therefore the QDs display interband optical transitions with strong oscillator strengths. By doping magnetic ions into these semiconductor QDs, spin splitting and spin-relevant optical property can be changed significantly due to strong sp - d exchange interactions between electrons or holes and magnetic ions 29,30 . QDs doped with a single Mn 2+ ion have been realized experimentally 31,32 .…”

Section: Introductionmentioning

confidence: 99%

Electric field tuning of spin splitting in topological insulator quantum dots doped with a single magnetic ion

Yang

Lin

et al. 2019

Sci Rep

View full text Add to dashboard Cite

We investigate theoretically the electron spin states in a disk-shaped topological insulator quantum dot (TIQD) containing a single magnetic Mn 2+ ion. We demonstrate that the energy spectra and the density distributions of the symmetry-protected edge states in a HgTe TIQD can be modulated effectively by a single magnetic impurity Mn 2+ . Additionally, when an in-plane external electric field is applied., it not only tunes the spin splittings of edge states via the s ( p )- d exchange interaction between the electron (hole) and the magnetic Mn 2+ ion respectively, but also gives rise to the bright-to-dark transitions in the optical transition spectrum. Such spin properties of TIQDs with single Mn 2+ ion as illustrated in this work could offer a new platform for topological electro-optical devices.

show abstract

Section: Introductionmentioning

confidence: 99%

Electric field tuning of spin splitting in topological insulator quantum dots doped with a single magnetic ion

Yang

Lin

et al. 2019

Sci Rep

View full text Add to dashboard Cite

show abstract

“…The energy spectrum of CdTe quantum dots with a single Mn atom has been studied in the past 21,30,48 and here we only review the main features, with an emphasis on those that are relevant for our work.…”

Section: A Energy Spectrummentioning

confidence: 99%

Spin relaxation in CdTe quantum dots with a single Mn atom

Petrović

Vukmirović

2012

Phys. Rev. B

View full text Add to dashboard Cite

We have investigated spin relaxation times in CdTe quantum dots doped with a single Mn atom, a prototype of a system where the interaction between a single charge carrier and a single spin takes place. A theoretical model that was used includes the electron-Mn spin exchange interaction responsible for mixing of the states of different spin in the basic Hamiltonian and electron-phonon interaction as a perturbation responsible for transitions between the states. It was found that the dominant electron-phonon interaction mechanism responsible for spin relaxation is the interaction with acoustic phonons through deformation potential. Electron and Mn spin relaxation times at room temperature take values in the range from microseconds at a magnetic field of 0.5 T down to nanoseconds at a magnetic field of 10 T and become three orders of magnitude larger at cryogenic temperatures. It was found that electron spin-orbit interaction has a negligible effect on spin relaxation times, while the changes in the position of the Mn atom within the dot and in the dot dimensions can change the spin relaxation times by up to one order of magnitude.Comment: 9 pages, 5 figure

show abstract

“…De Groote, Hornos and Chaplik (1992) also calculated the magnetization, susceptibility and heat capacity of helium like confined QDs and obtained the additional structure in magnetization. In a detailed study, Nguyen and Peeters (2008) considered the QD in the presence of a single magnetic ion and applied magnetic field taking into account the electron-electron correlation in many electron quantum dot. They displayed the dependence of these thermal and magnetic quantities: C v , ℳ and χ on the strength of the magnetic field, confinement frequency, magnetic ion position and temperature.…”

Section: Introductionmentioning

confidence: 99%

The Effects Of Pressure And Temperature On The Magnetization Of A Parabolic Quantum Dot In A Magnetic Field

Bzour

Elsaid

2018

MJS

View full text Add to dashboard Cite

In this work , we present a theoretical study of the magnetization of two-electron GaAs parabolic quantum dot (QD) under the combined effects of external pressure, temperature and magnetic field. First, we obtain the eigenenergies by solving the two electron quantum dot Hamiltonian using the exact diagonalization method. The obtained results show that the energy levels of the quantum dot depend strongly on the pressure and temperature. Next, we investigate the dependence of magnetization of a quantum dot as a function of external pressure, temperature, confining frequency and magnetic field. The singlet-triplet transitions in the ground state of the quantum dot spectra and the corresponding jumps in the magnetization curves have been shown .The comparison shows that our results are in very good agreement with the reported works.

show abstract

Magnetic field dependence of the many-electron states in a magnetic quantum dot: The ferromagnetic-antiferromagnetic transition

Cited by 43 publications

References 32 publications

Electric field tuning of spin splitting in topological insulator quantum dots doped with a single magnetic ion

Electric field tuning of spin splitting in topological insulator quantum dots doped with a single magnetic ion

Spin relaxation in CdTe quantum dots with a single Mn atom

The Effects Of Pressure And Temperature On The Magnetization Of A Parabolic Quantum Dot In A Magnetic Field

Contact Info

Product

Resources

About