Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Durnev, M. V.; Glazov, M. M.; Ivchenko, E. L.; Jo, Masafumi; Mano, Takaaki; Kuroda, Takashi; Sakoda, Kazuaki; Kunz, S.; Sallen, Gregory; Bouet, L.; Marie, X.; Lagarde, Delphine; Amand, T.; Urbaszek, B.

doi:10.1103/physrevb.87.085315

Cited by 25 publications

(72 citation statements)

References 64 publications

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“…First, QDs with low symmetry (approaching C s ) can exhibit extra optically active states even at zero magnetic field [26,46]. QDs with C 3v symmetry also show more than two emission lines when a magnetic field is applied parallel to the QD high-symmetry axis [52][53][54]. In contrast, when the QD symmetry is elevated from C 3v to D 3h , only two emission lines are resolved in Faraday geometry [43].…”

Section: -5mentioning

confidence: 93%

Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

et al. 2014

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Quantum-dot-in-nanowire systems constitute building blocks for advanced photonics and sensing applications. The electronic symmetry of the emitters impacts their function capabilities. Here we study the fine structure of gallium-rich quantum dots nested in the shell of GaAs-Al 0.51 Ga 0.49 As core-shell nanowires. We used optical spectroscopy to resolve the splitting resulting from the exchange terms and extract the main parameters of the emitters. Our results indicate that the quantum dots can host neutral as well as charged excitonic complexes and that the excitons exhibit a slightly elongated footprint, with the main axis tilted with respect to the long axis of the host nanowire. GaAs-Al x Ga 1−x As emitters in a nanowire are particularly promising for overcoming the limitations set by strain in other systems, with the benefit of being integrated in a versatile photonic structure.

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Section: -5mentioning

confidence: 93%

Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

et al. 2014

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“…The effect of a magnetic field on the emission spectra of electron-hole complexes in highly symmetric quan tum dots grown along the [111] direction is signifi cantly different as compared to the [001] quantum dots with a lower symmetry. In particular, the mag netic field directed along the growth axis leads to a mixing of heavy hole states with the opposite angular momentum projections onto this axis, which makes it possible to observe additional lines in the PL spectra of excitons and trions [10,23]. This paper presents a theory of the Zeeman effect and fine structure of the energy spectrum of electronhole complexes in trigonal quantum dots.…”

Section: Introductionmentioning

confidence: 96%

Fine structure of electron-hole complexes in trigonal quantum dots

Durnev

2015

Phys. Solid State

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A theory of the Zeeman effect and fine structure of the energy spectrum of electron-hole com plexes in highly symmetric quantum dots grown along the [111] direction from materials with a zinc blende lattice has been presented. In the studied quantum dots with C 3v point symmetry, the Zeeman effect for a heavy hole in a magnetic field B || [111] has an unusual form: in addition to the diagonal component (g h1 ), the effective tensor of g factors contains the off diagonal element (g h2 ). For g h2 ≠ 0, there is a magnetically induced mixing of heavy hole states, which explains two additional lines observed in experimental photolu minescence spectra of excitons and trions. A microscopic theory of the effective g factors g h1 and g h2 within the Luttinger Hamiltonian in the spherical approximation has been discussed, as well as additional contribu tions to the off diagonal element g h2 due to the warping of the spectrum of holes. The results of theoretical calculations of the g factors g h1 and g h2 for quantum dots based on GaAs have been compared with the exper imental data.

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“…Due to interplay of the spin-orbit interaction, the external magnetic field, and the lateral gate potential imposed on the heterostructure spin dynamics of the arising 2D system is highly nontrivial. For example, for out-of-plane magnetic field the g-factor of hole is significantly modified by the virtual 3D dynamics [24][25][26][27] . The virtual 3D dynamics is even more important for response to the in-plane magnetic field 13,28 .…”

Section: Introductionmentioning

confidence: 99%

“…The virtual 3D dynamics is even more important for response to the in-plane magnetic field 13,28 . Effects of magnetic field in some dimensionally reduced systems have been considered previously, but only in some limiting cases 13,[24][25][26][27][28][29] . The spin-orbital effects related to the lateral gate potential to the best of our knowledge have been considered before only in a very special limit related to the artificial graphene 30 .…”

Section: Introductionmentioning

confidence: 99%

Dimensional reduction of the Luttinger Hamiltonian andg-factors of holes in symmetric two-dimensional semiconductor heterostructures

Miserev

Sushkov

2017

Phys. Rev. B

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The spin-orbit interaction of holes in zinc-blende semiconductors is much stronger than that of electrons. This makes the hole systems very attractive for possible spintronics applications. In three dimensions (3D) dynamics of holes is described by well known Luttinger Hamiltonian. However, most of recent spintronics applications are related to two dimensional heterostructures where dynamics in one direction is frozen due to quantum confinement. The confinement results in dimensional reduction of the Luttinger Hamiltonian, 3D→2D. Due to interplay of the spin-orbit interaction, the external magnetic field, and the lateral gate potential imposed on the heterostructure the reduction is highly nontrivial and not known. In the present work we perform the reduction and hence derive the general effective Hamiltonian which describes spintronics effects in symmetric two-dimensional (2D) heterostructures. In particular, we do the following, (i) derive the spinorbit interaction and the Darwin interaction related to the lateral gate potential, (ii) determine the momentum dependent out-of-plane g-factor, (iii) point out that there are two independent in-plane g-factors, (iv) determine momentum dependencies of the in-plane g-factors.

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Magnetic field induced valence band mixing in [111] grown semiconductor quantum dots

Cited by 25 publications

References 64 publications

Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

Exciton footprint of self-assembled AlGaAs quantum dots in core-shell nanowires

Fine structure of electron-hole complexes in trigonal quantum dots

Dimensional reduction of the Luttinger Hamiltonian andg-factors of holes in symmetric two-dimensional semiconductor heterostructures

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