Probability backflow is investigated for charged spin-$1/2$ particles in a uniform magnetic field within the lowest-Landau-level approximation. While single-mode Landau states exhibit only weak and non-robust backflow, it is shown that two-mode interference gives rise to negative probability flux in both the Schr\"odinger and Pauli formulations. In the Pauli case, orbital and spin contributions to the probability current are explicitly separated, revealing an additional interference mechanism. The external magnetic field is found to act as a tunable control parameter, simultaneously controlling the spatial overlap of orbitals and the spin dynamics. In the two-mode regime, a resonance between orbital mismatch and spin precession leads to an enhancement of backflow. Finite spatial resolution is shown not to suppress the effect within realistic coarse-graining. These results establish magnetic-field-controlled quantum backflow in Landau systems as an accessible interference phenomenon.
We present a flexible modeling framework for flopping-mode spin qubits that captures the spatial structure of the double-well confinement and magnetic-field-gradient profile going beyond conventional low-energy descriptions. By using this approach, we simulate electric dipole spin resonance-based single-qubit control a...
Ashutosh Kinikar, V. Levajac, K. Moors et al.· Journal of Applied Physics· 1 citation
A magnetic field that acts identically on two quantum dots is not expected to move charge between them. Nevertheless, we show that a uniform Zeeman field can strongly reconfigure and even reverse the single-electron charge polarization of an asymmetric open double quantum dot. Using a symmetry-preserving Green's-functi...
We study photon-assisted transport through a noninteracting, effectively spin-polarized quantum dot (QD) that is connected to two normal-metal leads and side-coupled to a Majorana bound state (MBS) at the end of a topological superconducting nanowire, with the QD level modulated periodically in time. Combining Floquet...
Xiang-Wei Meng, Tong Gong, Shi-Quan Lu et al.· Physica Scripta· 0 citations
Quantum quenches can generate substantial nonstabilizerness, but generating a large amount of magic does not by itself guarantee its later retention. We study an open transverse-field Ising chain perturbed by a longitudinal field that removes the free-fermion integrable structure of the G = 0 model. Exact finite-size c...
M. F. Yassen, A. Saad, E. Jaradat et al.· Europhysics letters· 0 citations
Levitated particles trapped in double-well potentials provide a promising platform for exploring quantum dynamics beyond the harmonic regime. We show that such systems exhibit a distinctive quantum signature arising from tunneling-assisted interference. Unlike classical dynamics, where the two wells are disconnected, i...
We study a beam of nonrelativistic spin-$\frac{1}{2}$ charge carriers incident normally on a finite slab of helical magnetic field aligned along the beam axis. Starting from the Pauli--Schrödinger equation, we apply a unitary transformation expressed in terms of Pauli matrices to map the system to a spatially independe...
Daniel Martinez, J. A. Reyes, Abraham Lima· Journal of Physics: Condense...· 0 citations
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