Magnetoplasmon excitations in Rashba spintronic quantum wires: Maxons, rotons, and negative-energy dispersionn
Poster-In-person · Withdrawn
Abstract
We study collective magnetoplasmon excitations in a quasi-one-dimensional (Q1D) quantum wire formed by a quasi-2D electron gas under harmonic confinement (x-direction), a perpendicular magnetic field, and Rashba spin–orbit interaction (SOI), within the framework of Bohm–Pines randon-phase approximation (RPA). The resultant system is a
quasi-one-dimensional (Q1D) quantum wire with free propagation along the y direction and magnetoelectric quantization along the x.The system is governed by three
competing length scales from confinement, magnetic field, and SOI. Intrasubband modes show negative energy dispersion with increasing magnetic field, while intersubband
modes exhibit magnetoroton excitations that change group velocity twice before merging with the single-particle continuum. Rashba SOI strongly influences both modes --
enhancing Landau damping at short wavelengths. The observed characteristics make the Q1D systems potential candidates for quantum-wire-based spintronic devices with
wavelength-dependent properties.
quasi-one-dimensional (Q1D) quantum wire with free propagation along the y direction and magnetoelectric quantization along the x.The system is governed by three
competing length scales from confinement, magnetic field, and SOI. Intrasubband modes show negative energy dispersion with increasing magnetic field, while intersubband
modes exhibit magnetoroton excitations that change group velocity twice before merging with the single-particle continuum. Rashba SOI strongly influences both modes --
enhancing Landau damping at short wavelengths. The observed characteristics make the Q1D systems potential candidates for quantum-wire-based spintronic devices with
wavelength-dependent properties.
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· 110 Publication: 1. M.S. Kushwaha and S.E. Ulloa, Phys. Rev. B {\bf 73}, 205306 (2006).
2. M.S. Kushwaha and S.E. Ulloa, Phys. Rev. B {\bf 73}, 045335 (2006).
3. M.S. Kushwaha, Phys. Rev. B {\bf 74}, 045304 (2006).
4. M.S. Kushwaha, Phys. Rev. B {\bf 76}, 245315 (2007).
5. M.S. Kushwaha, J. Appl. Phys. {\bf 104}, 083714 (2008).
Presenters
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Manvir Kushwaha
- Rice University