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Magnetic Control of Paired Exciton Vortices in TMD Heterobilayers.

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Title: Magnetic Control of Paired Exciton Vortices in TMD Heterobilayers.
Authors: Chen, Yingda1,2 (AUTHOR) chenyd@tzc.edu.cn, Cai, Yongyong3 (AUTHOR), Han, Yibo4 (AUTHOR), Chen, Jigen1 (AUTHOR) kiddchen@126.com, Lou, Wenkai2 (AUTHOR) wklou@semi.ac.cn
Source: Chinese Physics Letters. 2026, Vol. 43 Issue 7, p1-8. 8p.
Subjects: Zeeman effect, Exciton theory, Spin-orbit interactions, Magnetic control, Gross-Pitaevskii equations
Abstract: Rashba-enabled paired exciton vortices provide a promising platform for programmable phase textures in van der Waals excitonic devices. Here, we develop a predictive analytic onset theory for accessing paired bright–dark interlayer-exciton vortices in a finite MoS2/WSe2 disk under a perpendicular magnetic field. The field tunes the bright–dark detuning Δbd(B) = E b(B) − E d(B) through Zeeman effect, thereby driving the system into or out of the vortex-access regime. Rashba spin-orbit coupling supplies the angular-momentum-changing bright–dark mixing required for vortex formation, and projection onto the lowest vortex-active disk doublet yields a mass-resolved square-root entry threshold incorporating a finite-size confinement floor and a weak detuning-sign asymmetry. Full-disk diagonalization further reveals that the paired-vortex doublet remains spectrally isolated from the nonvortex single-mode sector only within a detuning-dependent spinor-core window associated with a finite-temperature coherence bound. Driven-dissipative complex Gross–Pitaevskii simulations demonstrate that this selected doublet survives under pump, loss, and interactions as a robust nonlinear attractor. Together, the analytic, spectral, thermal, and dynamical criteria establish magnetic control of Δbd(B) as a practical route for accessing and stabilizing paired-vortex condensates in finite excitonic devices. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Rashba-enabled paired exciton vortices provide a promising platform for programmable phase textures in van der Waals excitonic devices. Here, we develop a predictive analytic onset theory for accessing paired bright–dark interlayer-exciton vortices in a finite MoS2/WSe2 disk under a perpendicular magnetic field. The field tunes the bright–dark detuning Δbd(B) = E b(B) − E d(B) through Zeeman effect, thereby driving the system into or out of the vortex-access regime. Rashba spin-orbit coupling supplies the angular-momentum-changing bright–dark mixing required for vortex formation, and projection onto the lowest vortex-active disk doublet yields a mass-resolved square-root entry threshold incorporating a finite-size confinement floor and a weak detuning-sign asymmetry. Full-disk diagonalization further reveals that the paired-vortex doublet remains spectrally isolated from the nonvortex single-mode sector only within a detuning-dependent spinor-core window associated with a finite-temperature coherence bound. Driven-dissipative complex Gross–Pitaevskii simulations demonstrate that this selected doublet survives under pump, loss, and interactions as a robust nonlinear attractor. Together, the analytic, spectral, thermal, and dynamical criteria establish magnetic control of Δbd(B) as a practical route for accessing and stabilizing paired-vortex condensates in finite excitonic devices. [ABSTRACT FROM AUTHOR]
ISSN:0256307X
DOI:10.1088/0256-307X/43/7/070709