Spin-orbit effects in nanowire-based wurtzite semiconductor quantum dots

Intronati, Guido Alfredo; Tamborenea, P. I.; Weinmann, Dietmar; Jalabert, Rodolfo A.

doi:10.1103/physrevb.88.045303

Cited by 25 publications

(14 citation statements)

References 39 publications

(90 reference statements)

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“…QDs in novel low-dimensional structures, such as bilayer graphene [38,[51][52][53] and semiconductor nanowires with strong SOC [54,55], are actively studied and the applicability of these structures for hosting qubits has also been discussed. Motivated by the interesting physics revealed in these studies, we now consider QDs in twodimensional semiconducting TMDCs defined by external electrostatic gates.…”

Section: A Quantum Dots In Tmdcsmentioning

confidence: 99%

Spin-Orbit Coupling, Quantum Dots, and Qubits in Monolayer Transition Metal Dichalcogenides

et al. 2014

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We derive an effective Hamiltonian that describes the dynamics of electrons in the conduction band of monolayer transition metal dichalcogenides (TMDC) in the presence of perpendicular electric and magnetic fields. We discuss in detail both the intrinsic and the Bychkov-Rashba spin-orbit coupling induced by an external electric field. We point out interesting differences in the spin-split conduction band between different TMDC compounds. An important consequence of the strong intrinsic spin-orbit coupling is an effective out-of-plane g factor for the electrons that differs from the free-electron g factor g ≃ 2. We identify a new term in the Hamiltonian of the Bychkov-Rashba spin-orbit coupling that does not exist in III-V semiconductors. Using first-principles calculations, we give estimates of the various parameters appearing in the theory. Finally, we consider quantum dots formed in TMDC materials and derive an effective Hamiltonian that allows us to calculate the magnetic field dependence of the bound states in the quantum dots. We find that all states are both valley and spin split, which suggests that these quantum dots could be used as valley-spin filters. We explore the possibility of using spin and valley states in TMDCs as quantum bits, and conclude that, due to the relatively strong intrinsic spin-orbit splitting in the conduction band, the most realistic option appears to be a combined spin-valley (Kramers) qubit at low magnetic fields.

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Section: A Quantum Dots In Tmdcsmentioning

confidence: 99%

Spin-Orbit Coupling, Quantum Dots, and Qubits in Monolayer Transition Metal Dichalcogenides

et al. 2014

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“…They predict the longest spin lifetimes (0.5 ms) for AlN at room temperature [48]. In [49] has been derived the effect of the SO interaction on the electronic states and the acoustic-phononinduced spin relaxation rates of cylindrical quantum dots defined on quantum wires having wurtzite lattice structure, taking into account the linear and cubic Dresselhaus SO couplings and a weak applied magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Influence of spin–orbit interactions on the polaron properties in wurtzite semiconductor quantum well

Yeranosyan

Vartanian

Vardanyan

2016

Physica E: Low-dimensional Systems and Nanostructures

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“…Over the last years, numerous groups have successfully developed sophisticated understanding and techniques which facilitate an excellent control of the crystal phase. [33][34][35][36][37][38][39][40][41] Since the intrinsic SOC effects in these exceptional wurtzite systems are relatively unexplored, several recent studies have addressed this issue theoretically [42][43][44][45][46][47] and experimentally. [48][49][50] Among the diverse experimental methods, low-field magnetoconductance and optical orientation measurements provide convenient access to the desired information on nanowires (cf.…”

Section: Introductionmentioning

confidence: 99%

Spin relaxation in wurtzite nanowires

et al. 2018

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We theoretically investigate the D'yakonov-Perel' spin relaxation properties in diffusive wurtzite semiconductor nanowires and their impact on the quantum correction to the conductivity. Although the lifetime of the long-lived spin states is limited by the dominant k-linear spin-orbit contributions in the bulk, these terms show almost no effect in the finite-size nanowires. Here, the spin lifetime is essentially determined by the small k-cubic spin-orbit terms and nearly independent of the wire radius. At the same time, these states possess in general a complex helical structure in real space that is modulated by the spin precession length induced by the k-linear terms. For this reason, the experimentally detected spin relaxation largely depends on the ratio between the nanowire radius and the spin precession length as well as the type of measurement. In particular, it is shown that while a variation of the radius hardly affects the magnetoconductance correction, which is governed by the long-lived spin states, the change in the spin lifetime observed in optical experiments can be dramatic. We compare our results with recent experimental studies on wurtzite InAs nanowires.

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Spin-orbit effects in nanowire-based wurtzite semiconductor quantum dots

Cited by 25 publications

References 39 publications

Spin-Orbit Coupling, Quantum Dots, and Qubits in Monolayer Transition Metal Dichalcogenides

Spin-Orbit Coupling, Quantum Dots, and Qubits in Monolayer Transition Metal Dichalcogenides

Influence of spin–orbit interactions on the polaron properties in wurtzite semiconductor quantum well

Spin relaxation in wurtzite nanowires

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