Laughlin charge pumping from interplay of chiral Dirac and chiral Majorana modes
arXiv:2509.14512 · doi:10.1103/8drx-qktw
Abstract
Laughlin charge pumping has provided critical insights into the topological classification of individual materials, but remains largely unexplored in topological junctions. We explore Laughlin charge pumping in junctions composed of a chiral topological superconductor sandwiched between two quantum anomalous Hall insulators, driven by an adiabatically varying magnetic flux. Here, charge pumping can be mediated merely by chiral Dirac modes or by the interplay of chiral Dirac and chiral Majorana modes (CMMs). In the former case, a variation of one magnetic flux quantum induces the pumping of a unit charge, as the chiral Dirac mode accumulates the full flux-induced phase. In contrast, in the latter case, pumping a unit charge requires a variation of fractional magnetic flux quanta, determined by the device geometry and the parity of the number of enclosed superconducting vortices. This unique feature results from the charge-neutral and zero-momentum nature of zero-energy CMMs. Our work offers an experimentally viable pathway toward detecting CMMs and could also inspire further research into Laughlin charge or spin pumping in diverse topological junctions, which are now within experimental reach.
Main text: 7 pages, 4 figures, and 2 tables; Supplemental material: 5 pages, 1 figure
References in corpus (17)
- Non-Abelian Anyons and Topological Quantum Computation
- Quantized Anomalous Hall Effect in Magnetic Topological Insulators
- Time Reversal Polarization and a Z_2 Adiabatic Spin Pump
- Electrically detected interferometry of Majorana fermions in a topological insulator
- Colloquium: Quantum anomalous Hall effect
- Laughlin's topological charge pump in an atomic Hall cylinder
- Scattering theory of chiral Majorana fermion interferometry
- Creation of Chiral Interface Channels for Quantized Transport in Magnetic Topological Insulator Multilayer Heterostructures
- Induced superconducting correlations in the quantum anomalous Hall insulator
- Electrically tunable topological superconductivity and Majorana fermions in two dimensions
- Recent progress on Majorana in semiconductor-superconductor heterostructures--Engineering and detection
- Theory of Caroli-de Gennes-Matricon analogs in full-shell hybrid nanowires
- Proximity-induced superconducting gap in the intrinsic magnetic topological insulator MnBi2Te4
- Proximity-induced quasi-one-dimensional superconducting quantum anomalous Hall state: a promising scalable top-down approach towards localized Majorana modes
- Searching for Majorana quasiparticles at vortex cores in iron-based superconductors
- Inducing superconductivity in quantum anomalous Hall regime
- Electrostatic effects of the MnBi2Te4-superconductor hetero-structures in chiral Majorana search