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Chinese Journal of Physics

The magnetic effects on the electronic and optical properties of double-well potentials

Yi-Siang Chen, Chiao-Ling Cheng, Chih‐Yuan Lin

Published Mar 4, 2026• 0 citations
Publisher
DOI
10.1016/j.cjph.2026.03.001

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Double-well potential structures provide rich capabilities for single electron control via different physical characteristics of the potentials and the electron state. Here, we investigate the effect of a uniform magnetic field on the electron state interference pattern manifesting in a focusing double-well potential structure by conducting Wigner quantum transport experiments. We analyze the electron density and the negativity of the Wigner function and show how the magnetic field controls the electron state but also destroys the coherence of the evolution dynamics. Our work contributes to the fundamental understanding of magnetic field based single electron control mechanisms and sheds light on the critical decoherence processes.
Abstract The paper examines the linear and non-linear optical characteristics of an electron in harmonic Gaussian asymmetrical double quantum wells, taking into account thermodynamic variables such as temperature and hydrostatic pressure. Numerical calculations by considering the effective mass and parabolic band approximation are performed. The electron contained within an asymmetric double well generated by the sum of a parabolic and Gaussian potential has its eigenvalues and eigenfunctions determined using the diagonalization approach. For nonlinear optical coefficients, the density matrix expansion is used. Wavefunctions and energy levels vary as an effect of the applied fields. In harmonic Gaussian asymmetrical double quantum wells, the total optical absorption coefficient (TOAC), the relative refractive index changes (RRIC), and second harmonic generation (SHG) have all been theoretically investigated. The magnitude and position of the resonant peaks are significantly influenced by the hydrostatic pressure and temperature effects. With controllable coupling and externally applied hydrostatic pressure and temperature, the potential model presented in this study can be used to simulate and manipulate the optical and electronic properties of the asymmetric double-quantum heterostructures, such as double quantum dots and wells.