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Anomalous phase shift of Shubnikov - de Haas oscillations in HgTe quantum well with inverted energy spectrum

The results of the longitudinal and Hall magnetoresistivity measurements in the Shubnikov - de Haas oscillation regime for the HgCdTe/HgTe/HgCdTe heterostructures with a wide (20.3 nm) HgTe quantum well are presented. An anomalous phase shift of magneto-oscillations is detected: in the region of spin-unsplit peaks the longitudinal resistivity maxima are located at even filling factor numbers in contradiction with a conventional situation in 2D systems. It is shown that the observed features are associated with the inverted nature of the spectrum in the investigated quantum well with the electron-type conduction along the size-quantized subband H1 of HgTe band Γ8, for which the spin splitting is comparable to (and even greater than) the orbital one. The results obtained are compared with the phase shift effects of both magneto-oscillations and the plateau of the quantum Hall effect in monolayer graphene.

preprint2020arXivOpen access
Neverov V. N.Klepikova A. S.Bogolubskii A. S.Gudina S. V.Turutkin K. V.Shelushinina N. G. 1Yakunin M. V.N. N. MikhailovS. A. Dvoretsky
cond-mat.mes-hall
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Neverov V. N.Klepikova A. S.Bogolubskii A. S.Gudina S. V.Turutkin K. V.Shelushinina N. G. 1Yakunin M. V.N. N. MikhailovS. A. Dvoretsky

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