Topological monopole's gauge field‐induced anomalous Hall effect in artificial honeycomb lattice

Journal Article · Tue Jul 12 00:00:00 EDT 2022 · Natural Sciences

DOI:https://doi.org/10.1002/ntls.20210083· OSTI ID:1875969

Guo, Jiasen ^[1]; Dugaev, Vitalii ^[2]; Ernst, Arthur ^[3]; Yumnam, George ^[1]; Ghosh, Pousali ^[1]; Singh, Deepak Kumar  ^[1]

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1. Department of Physics and Astronomy University of Missouri, Columbia Columbia Missouri USA
2. Department of Physics and Medical Engineering Rzeszów University of Technology Rzeszów Poland
3. Institut für Theoretisce Physik Johannes Kepler Universität Linz Austria, Max‐Planck‐Institut für Mikrostrukturphysik Halle Germany

Abstract Vortex magnetic structure in artificial honeycomb lattice provides a unique platform to explore emergent properties due to the additional Berry phase curvature imparted by chiral magnetization to circulating electrons via direct interaction. We argue that while the perpendicularly aligned magnetic component leads to the quantized flux of monopole at the center of the Berry sphere, the in‐plane vortex circulation of magnetization gives rise to unexpected nontrivial topological Berry phase due to the gauge field transformation. The unprecedented effect signifies the importance of vector potential in multiply connected geometrical systems. Experimental confirmations to proposed hypotheses are obtained from Hall resistance measurements on permalloy honeycomb lattice. Investigation of the topological gauge transformation due to the in‐plane chirality reveals anomalous quasi‐oscillatory behavior in Hall resistance as a function of perpendicular field. The oscillatory nature of is owed to the fluctuation in equilibrium current as a function of Fermi wave‐vector , envisaged under the proposed new formulation in this article. Our synergistic approach suggests that artificially tunable nanostructured material provides new vista to the exploration of topological phenomena of strong fundamental importance. Key Points Demonstration of gauge field flux due to vortex magnetism. Anomalous Hall effect in magnetic honeycomb lattice. Topological monopole‐induced magnetic flux.

• Sponsoring Organization: USDOE
• OSTI ID: 1875969
• Alternate ID(s): OSTI ID: 1894178
• Journal Information: Natural Sciences, Journal Name: Natural Sciences Vol. 2 Journal Issue: 4; ISSN 2698-6248
• Publisher: Wiley Blackwell (John Wiley & Sons)
• Country of Publication: Country unknown/Code not available
• Language: English