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Shubnikov-de Hass oscillations are directly observed in undopedantiferromagnetic topological insulator MnBi2Te4. With increasing magneticfields, the oscillation period decreases gradually in the magnetic transitionfrom canted antiferromagnetism to ferromagnetism and then saturates in highmagnetic fields, indicating the field-induced evolution of the band structure.From the analysis of the high-field oscillations, a nontrivial Berry phase anda small effective mass are extracted, in agreement with the predicted Weylsemimetal phase in ferromagnetic MnBi2Te4. Furthermore, rotating themagnetization of MnBi2Te4 can lead to a splitting of the high-fieldoscillations, which suggests the enhanced asymmetry of the Weyl cones in tiltedfields. Therefore, the observation of these magnetically tunable quantumoscillations clearly demonstrates the indispensable role of field in tuning theband structure or physical properties of MnBi2Te4.

Magnetically tunable Shubnikov-de Hass oscillations in MnBi2Te4