Surface-Dominated Anomalous Hall Effect in Altermagnetic MnTe Films

Abstract

Altermagnets have recently emerged as a new class of magnetic materials that combine compensated magnetic order with spin-split electronic band structures. In this work, we employ molecular beam epitaxy to grow MnTe thin films with controlled thickness on InP(111)A substrates. Using angle-resolved photoemission spectroscopy, we observe a large spin splitting of $\approx 230$ meV for bulk bands well below the Fermi level and identify surface states that cross the Fermi level. Electrical transport measurements show that a robust anomalous Hall (AH) effect persists down to 2 K and an AH sign reversal occurs near 175 K. By systematically tuning film thickness, growth conditions, and interfacial structure, we demonstrate that the AH response in MnTe films originates from surface states rather than bulk bands. Our first-principles calculations reveal that this surface-dominated AH effect is imprinted by the bulk altermagnetic order and remains unchanged for terminations with opposite Mn magnetic orientations. Our results establish a unique surface transport probe of bulk altermagnetism, demonstrate interface engineering as an effective route to generate and control the AH effect in altermagnets, and provide a unified understanding of the AH response in altermagnetic MnTe films.

arXiv comment25 pages, 5 figures, comments are very much welcome

Cited by in corpus (1)

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