Giant Topological Hall Effect in van der Waals Heterostructures of CrTe2/Bi2Te3

Abstract

Discoveries of interfacial topological Hall effect (THE) provide an ideal platform for exploring physics arising from the interplay between topology and magnetism. The interfacial topological Hall effect is closely related to the Dzyaloshinskii-Moriya interaction (DMI) at interface and topological spin textures. However, it is difficult to achieve a sizable THE in heterostructures due to the stringent constraints on the constituents of THE heterostructures such as strong spin-orbit coupling (SOC). Here we report the observation of a giant THE signal of 1.39 $\mu \Omega \cdot$cm in the van der Waals heterostructures of CrTe2/Bi2Te3 fabricated by molecular beam epitaxy, a prototype of two-dimensional (2D) ferromagnet (FM)/topological insulator (TI). This large magnitude of THE is attributed to an optimized combination of 2D ferromagnetism in CrTe2, strong SOC in Bi2Te3, and an atomically sharp interface. Our work reveals CrTe2/Bi2Te3 as a convenient platform for achieving large interfacial THE in hybrid systems, which could be utilized to develop quantum science and high-density information storage.

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Cited by in corpus (15)

• ZrTe2/CrTe2: an epitaxial van der Waals platform for spintronics
• Strain-tunable Berry curvature in quasi-two-dimensional chromium telluride
• Distinguishing two-component anomalous Hall effect from topological Hall effect
• Observation of colossal topological Hall effect in noncoplanar ferromagnet Cr5Te6 thin films
• Giant 2D Skyrmion Topological Hall Effect with Ultrawide Temperature Window and Low-Current Manipulation in 2D Room-Temperature Ferromagnetic Crystals
• Magnetic Switching in Monolayer 2D Diluted Magnetic Semiconductors via Spin-to- Spin Conversion
• Quantum anomalous Hall effects controlled by chiral domain walls
• Efficient Soft-Chemical Synthesis of Large van-der-Waals Crystals of the Room-Temperature Ferromagnet 1T-CrTe2
• Coherent backscattering in the topological Hall effect
• Significant electron-magnon scattering in layered ferromagnet Cr${}_2$Te${}_3$
• In-Plane Magnetic Anisotropy and Large topological Hall Effect in Self-Intercalated Ferromagnet Cr1.61Te2
• Proximity-induced nonlinear magnetoresistances on topological insulators
• Emergent Topological Hall Effect in Fe-doped Monolayer WSe2
• Meissner Effect and Nonreciprocal Charge Transport in Non-Topological 1T-CrTe2/FeTe Heterostructures
• Many-body electronic structure, self-doped double-exchange, and Hund metallicity in 1T-CrTe2 bulk and monolayer