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Issue 101, 2015
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Buckled honeycomb lattice materials and unconventional magnetic responses

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Abstract

We study the magnetic response of two-dimensional buckled honeycomb-lattice materials. The buckling breaks the sublattice symmetry, enhances the spin–orbit coupling, and allows the tuning of a topological quantum phase transition. As a result, there are two doubly degenerate spin–valley coupled massive Dirac bands, which exhibit an unconventional Hall plateau sequence under strong magnetic fields. We show how to externally control the splitting of anomalous zeroth Landau levels, the prominent Landau level crossing effects, and the polarizations of spin, valley, and sublattice degrees of freedom. In particular, we reveal that in a p–n junction, spin-resolved fractionally quantized conductance appears in a two-terminal measurement with a spin-polarized current propagating along the interface. In the zero- or low-field regime where the Landau quantization is not applicable, we provide a semiclassical description for the anomalous Hall transport. We comment briefly on the effects of electron–electron interactions and Zeeman couplings to electron spins and to atomic orbitals. Our predictions can be examined in the magneto-transport and/or magneto-optic experiments.

Graphical abstract: Buckled honeycomb lattice materials and unconventional magnetic responses

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Article information


Submitted
13 Jul 2015
Accepted
23 Sep 2015
First published
24 Sep 2015

RSC Adv., 2015,5, 83350-83360
Article type
Paper
Author version available

Buckled honeycomb lattice materials and unconventional magnetic responses

S. A. Yang, H. Pan and F. Zhang, RSC Adv., 2015, 5, 83350
DOI: 10.1039/C5RA13699G

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