Light-hole exciton mixing and dynamics in Mn-doped quantum dots

Moldoveanu, V.; Dinu, I. V.; Dragomir, Radu; Tanatar, B.

doi:10.1103/physrevb.93.165421

Cited by 8 publications

(11 citation statements)

References 34 publications

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“…In the absence of the Mn‐QD exchange interaction, one uses the configuration interaction method to calculate “exchange‐free” exciton and biexciton states

false| ν, M_{z} 〉

defined by the equation

{\overset{H}{true}}_{0} false| ν, M_{z} 〉 = E_{ν} false| ν, M_{z} 〉

where

{\overset{H}{true}}_{0} = {\overset{H}{true}}_{KL} + {\overset{H}{true}}_{C} + {\overset{H}{true}}_{coul} + D_{0} {\overset{M}{true}}_{z}^{2}

, and the hat denotes the second quantized form of the single‐particle operators. The diagonalization implies all many‐body configurations generated by the highest energy

N_{V}

single‐particle states in the VB and by the lowest energy

N_{C}

states in the CB (more details are given in ).

{\overset{H}{true}}_{coul}

describes the Coulomb interaction.…”

Section: The Modelmentioning

confidence: 99%

“…We shall denote by

P_{ν, M_{z}} : = 〈 ν, M_{z} false| \hat{ρ} false(t false) false| ν, M_{z} 〉

the population of the state

false| ν, M_{z} 〉

. Fore more details we refer to .…”

Section: The Modelmentioning

confidence: 99%

“…2 z , and the hat denotes the second quantized form of the single-particle operators. The diagonalization implies all many-body configurations generated by the highest energy N V single-particle states in the VB and by the lowest energy N C states in the CB (more details are given in [11]). Ĥ coul describes the Coulomb interaction.…”

Section: Papermentioning

confidence: 99%

“…They have found that the VB mixing leads to hole‐Mn spin relaxation. In a previous work, we have also studied the dynamics of mostly LH excitons and mixed biexcitons in single‐Mn doped QDs .…”

Section: Introductionmentioning

confidence: 99%

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Unpinning of heavy hole spin in magnetic quantum dots

Dinu

Moldoveanu

Dragomir

et al. 2016

Physica Status Solidi (b)

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Using the k·p theory and configuration interaction method, we analyze the effect of heavy hole–light hole (HH–LH) mixing in CdTe quantum dots (QDs) with a single manganese (Mn) ion. We find that the hole‐Mn exchange switches the coupling between two excitons whose Luttinger spinors have both HH and LH components. If the magnetic dopant is off‐centered and the QD is subjected to a single π pulse the system periodically bounces between bright and dark mostly HH excitons with opposite HH spins. A pump‐and‐probe setup allows to estimate the efficiency of this HH spin unpinning from the biexciton response. The biexciton absorption spectrum is also discussed.

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“…In the absence of the Mn‐QD exchange interaction, one uses the configuration interaction method to calculate “exchange‐free” exciton and biexciton states

false| ν, M_{z} 〉

defined by the equation

{\overset{H}{true}}_{0} false| ν, M_{z} 〉 = E_{ν} false| ν, M_{z} 〉

where

{\overset{H}{true}}_{0} = {\overset{H}{true}}_{KL} + {\overset{H}{true}}_{C} + {\overset{H}{true}}_{coul} + D_{0} {\overset{M}{true}}_{z}^{2}

, and the hat denotes the second quantized form of the single‐particle operators. The diagonalization implies all many‐body configurations generated by the highest energy

N_{V}

single‐particle states in the VB and by the lowest energy

N_{C}

states in the CB (more details are given in ).

{\overset{H}{true}}_{coul}

describes the Coulomb interaction.…”

Section: The Modelmentioning

confidence: 99%

“…We shall denote by

P_{ν, M_{z}} : = 〈 ν, M_{z} false| \hat{ρ} false(t false) false| ν, M_{z} 〉

the population of the state

false| ν, M_{z} 〉

. Fore more details we refer to .…”

Section: The Modelmentioning

confidence: 99%

Section: Papermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Unpinning of heavy hole spin in magnetic quantum dots

Dinu

Moldoveanu

Dragomir

et al. 2016

Physica Status Solidi (b)

Self Cite

View full text Add to dashboard Cite

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“…For all the systems studied so far it has been found that the ground state of the magnetic ion is significantly influenced by the local strain present in a quantum dot. Such an effect is of particular importance for future applications in solotronics (optoelectronics based on single dopants [17]) and spintronics based on magnetic QDs [18][19][20][21][22][23][24][25][26][27][28]. The effect of strain may be demonstrated as beating in the coherent precession of the single magnetic ion spin [29], as changes of occupation and energy of levels corresponding to various projections of the ion spin [1,7,15], or even as a change in the character of the Fe 2+ ion ground state, from nonmagnetic in bulk to magnetic in a QD [13].…”

Section: Introductionmentioning

confidence: 99%

Direct determination of the zero-field splitting for a singleCo2+ion embedded in a CdTe/ZnTe quantum dot

et al. 2018

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When a Co2+ impurity is embedded in a semiconductor structure, crystal strain strongly influences the zero-field splitting between Co 2+ states with spin projection S z = ±3/2 and S z = ±1/2. Experimental evidence of this effect has been given in previous studies; however, direct measurement of the strain-induced zero-field splitting has been inaccessible so far. Here this splitting is determined thanks to magneto-optical studies of an individual Co 2+ ion in an epitaxial CdTe quantum dot in a ZnTe barrier. Using partially allowed optical transitions, we measure the strain-induced zero-field splitting of the Co 2+ ion directly in the excitonic photoluminescence spectrum. Moreover, by observation of anticrossing of S z = +3/2 and S z = −1/2 Co 2+ spin states in a magnetic field, we determine the axial and in-plane components of the crystal field acting on the Co 2+ . The proposed technique can be applied to optical determination of the zero-field splitting of other transition-metal ions in quantum dots.

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Magnetic field induced mixing of light hole excitonic states in (Cd, Mn)Te/(Cd, Mg)Te core/shell nanowires

et al. 2018

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A detailed magneto-photoluminescence study of individual (Cd, Mn)Te/(Cd, Mg)Te core/shell nanowires grown by molecular beam epitaxy is performed. First of all, an enhancement of the Zeeman splitting due to sp-d exchange interaction between band carriers and Mn-spins is evidenced in these nanostructures. Then, it is found that the value of this splitting depends strongly on the magnetic field direction with respect to the nanowire axis. The largest splitting is observed when the magnetic field is applied perpendicular and the smallest when it is applied parallel to the nanowire axis. This effect is explained in terms of magnetic field induced valence band mixing and evidences the light hole character of the excitonic emission. The values of the light and heavy hole splitting are determined for several individual nanowires based on the comparison of experimental results to theoretical calculations.

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Light-hole exciton mixing and dynamics in Mn-doped quantum dots

Cited by 8 publications

References 34 publications

Unpinning of heavy hole spin in magnetic quantum dots

Unpinning of heavy hole spin in magnetic quantum dots

Direct determination of the zero-field splitting for a singleCo2+ion embedded in a CdTe/ZnTe quantum dot

Magnetic field induced mixing of light hole excitonic states in (Cd, Mn)Te/(Cd, Mg)Te core/shell nanowires

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