Buckled Honeycomb Lattice Materials and Unconventional Magnetic Responses

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Buckled Honeycomb Lattice Materials and Unconventional Magnetic Responses

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Title: Buckled Honeycomb Lattice Materials and Unconventional Magnetic Responses
Author(s):
Yang, S. A.;
Pan, H.;
Zhang, Fan
Date Created: 2015-09-24
Item Type: Article
Keywords: Show Keywords
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.
Publisher: Royal Society of Chemistry
ISSN: 2046-2069
Source: RSC Advances
Link to Related Resource: http://dx.doi.org/10.1039/c5ra13699g
Persistent Link: http://hdl.handle.net/10735.1/4814
Bibliographic Citation: Yang, S. A., H. Pan, and F. Zhang. 2015. "Buckled honeycomb lattice materials and unconventional magnetic responses." RSC Advances 5(101), doi: 10.1039/C5RA13699G.
Terms of Use: ©2015 The Royal Society of Chemistry. This article may not be further made available or distributed.
Sponsors: We would like to thank D. L. Deng, Cheng-Cheng Liu, Yugui Yao, J. Xiao, and Chuanwei Zhang for helpful discussions. S. A. Y. is supported by SUTD-SRG-EPD2013062. H. P. is supported by NSFC Grant No. 11174022. F. Z. is supported by UT Dallas research enhancement funds.

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