Spin Rotation by Resonant Electric Field in Few-Level Quantum Dots: Floquet Dynamics and Tunneling

Khomitsky, D. V.; Лаврухина, Е. А.; Sherman, E. Ya.

doi:10.1103/physrevapplied.14.014090

Cited by 15 publications

(10 citation statements)

References 59 publications

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“…, where σ z,x represents the Pauli spin matrices. [33] Note that this strong spin-orbit coupled 1D dispersion has many applications in the studies of the spin-orbit qubit [34][35][36][37][38][39] and the Bose gases. [40][41][42][43][44] Inspired by recent advances in manipulating electrically the hole spin in a Ge nanowire quantum dot, [26,[45][46][47][48] here we address the spinorbit coupling physics in a Ge nanowire.…”

Section: Introductionmentioning

confidence: 99%

Electrical manipulation of a hole ‘spin’–orbit qubit in nanowire quantum dot: The nontrivial magnetic field effects

Zhang

2023

Chinese Phys. B

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Strong ‘spin’-orbit coupled one-dimensional hole gas is achievable in a Ge nanowire in the presence of a strong magnetic field. The strong magnetic field lifts the two-fold degeneracy in the hole subband dispersions, such that the effective low-energy subband dispersion exhibits strong ‘spin’-orbit coupling. Here, we study the electrical ‘spin’ manipulation in a Ge nanowire quantum dot for both the lowest and second lowest hole subband dispersions. Using a finite square well to model the quantum dot confining potential, we calculate exactly the level splitting of the ‘spin’-orbit qubit and the Rabi frequency in the electric-dipole ‘spin’ resonance. The ‘spin’-orbit coupling modulated longitudinal g-factor g so is not only non-vanishing but also magnetic field dependent. Moreover, the ‘spin’-orbit couplings of the lowest and second lowest subband dispersions have opposite magnetic dependences, such that the results for these two subband dispersions are totally different.

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Section: Introductionmentioning

confidence: 99%

Electrical manipulation of a hole ‘spin’–orbit qubit in nanowire quantum dot: The nontrivial magnetic field effects

Zhang

2023

Chinese Phys. B

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“…Growing interest in spin-dependent phenomena on the nanoscale led to the observation of the EDSR in GaAs quantum dots [8], and the subsequent theoretical analysis clarified the dot-specific features of the spin manipulation by the electric field [9][10][11]. The research has been mostly concentrated on various dynamical features of a single-electron motion caused by uniform monochromatic [12,13], bichromatic [14], and pulse-shaped [15,16] driving electric fields. For studying the role of spin-dependent electron-electron interaction and its potential for the use in quantum information, two-electron quantum dots have attracted considerable research (see, e.g.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast entanglement switching and singlet–triplet transitions control via structured terahertz pulses

2022

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Terahertz (THz) vector beams with spatially textured polarization are proposed to steer the spin and spatial distributions of two interacting electrons in a quantum dot. We study theoretically the spatiotemporal evolution of the spin and the charge-current densities and quantify the behavior of entanglement by calculating the concurrence. Both aspects are shown to be controllable efficiently and on the picosecond (ps) time scale by the parameters of the driving fields. Analyzing two different materials, GaAs and InGaAs, with different electron g−factors, we study the relationship between the g−factor and type of spin-orbit coupling required to produce efficient interlevel transitions. The results are useful for applications of quantum dots as basic nanoscale hardware elements in quantum information technology and for producing swiftly desired spin and charge currents on demand.

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“…However, there is an additional spin degeneracy in the hole subband dispersions [25]. We note that the above strong * ruili@ysu.edu.cn spin-orbit coupled electron gas model has many applications in the studies of the spin-orbit qubits [28][29][30][31][32][33][34][35], the Bose-Einstein condensations [36][37][38], and the Majorana fermions [39,40].…”

Section: Introductionmentioning

confidence: 99%

Searching strong `spin'-orbit coupled one-dimensional hole gas in strong magnetic fields

2021

Preprint

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We show that a strong 'spin'-orbit coupled one-dimensional (1D) hole gas is achievable via applying a strong magnetic field to the originally two-fold degenerate hole gas confined in a cylindrical Ge nanowire. Both strong longitudinal and strong transverse magnetic fields are feasible to achieve this goal. The induced low-energy subband dispersion of the hole gas can be written as E = 2 k 2 z /(2m * h ) + ασ z kz + g * h µBBσ x /2, a form that is exact the same as that of the electron gas in the conduction band. Also, the induced hole effective m * h (0.07 ∼ 0.08 me) and the 'spin'-orbit coupling α (0.4 ∼ 0.65 eV Å) have a small magnetic field dependence, while the effective g-factor g * h of the hole 'spin' only has a small magnetic field dependence in the large fields region.

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Spin Rotation by Resonant Electric Field in Few-Level Quantum Dots: Floquet Dynamics and Tunneling

Cited by 15 publications

References 59 publications

Electrical manipulation of a hole ‘spin’–orbit qubit in nanowire quantum dot: The nontrivial magnetic field effects

Electrical manipulation of a hole ‘spin’–orbit qubit in nanowire quantum dot: The nontrivial magnetic field effects

Ultrafast entanglement switching and singlet–triplet transitions control via structured terahertz pulses

Searching strong `spin'-orbit coupled one-dimensional hole gas in strong magnetic fields

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