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• W2619463669 abstract "The Aharonov-Bohm (AB) effect in square phosphorene quantum rings, with armchair and zigzag edges, is investigated using the tight-binding method. The energy spectra and wave functions of such rings, obtained as a function of the magnetic flux $mathrm{ensuremath{Phi}}$ threading the ring, are strongly influenced by the ring width $W$, an in-plane electric field ${E}_{p}$, and a side-gating potential ${V}_{g}$. Compared to a square dot, the ring shows an enhanced confinement due to its inner edges and an interedge coupling along the zigzag direction, both of which strongly affect the energy spectrum and the wave functions. The energy spectrum that is gapped consists of a regular part, of conduction (valence) band states, that shows the usual AB oscillations in the higher- (lower-) energy region, and of edge states, in the gap, that exhibit no AB oscillations. As the width $W$ decreases, the AB oscillations become more distinct and regular and their period is close to ${mathrm{ensuremath{Phi}}}_{0}/2$, where the flux quantum ${mathrm{ensuremath{Phi}}}_{0}=h/e$ is the period of an ideal circular ring ($Wensuremath{rightarrow}0$). Both the electric field ${E}_{p}$ and the side-gating potential ${V}_{g}$ reduce the amplitude of the AB oscillations. The amplitude can be effectively tuned by ${E}_{p}$ or ${V}_{g}$ and exhibits an anisotropic behavior for different field directions or side-gating configurations." @default.
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• W2619463669 date "2017-05-22" @default.
• W2619463669 modified "2023-09-29" @default.
• W2619463669 title "Aharonov-Bohm oscillations in phosphorene quantum rings" @default.
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• W2619463669 doi "https://doi.org/10.1103/physrevb.95.205426" @default.
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