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Liu G, Liu SB, Xu B, et al. Multiple Dirac Points and Hydrogenation-Induced Magnetism of Germanene Layer on Al (111) Surface. J Phys Chem Lett. 2015;6(24):4936-42doi: 10.1021/acs.jpclett.5b02413.
Liu, G., Liu, S. B., Xu, B., Ouyang, C. Y., Song, H. Y., Guan, S., & Yang, S. A. (2015). Multiple Dirac Points and Hydrogenation-Induced Magnetism of Germanene Layer on Al (111) Surface. The journal of physical chemistry letters, 6(24), 4936-42. https://doi.org/10.1021/acs.jpclett.5b02413
Liu, G, et al. "Multiple Dirac Points and Hydrogenation-Induced Magnetism of Germanene Layer on Al (111) Surface." The journal of physical chemistry letters vol. 6,24 (2015): 4936-42. doi: https://doi.org/10.1021/acs.jpclett.5b02413
Liu G, Liu SB, Xu B, Ouyang CY, Song HY, Guan S, Yang SA. Multiple Dirac Points and Hydrogenation-Induced Magnetism of Germanene Layer on Al (111) Surface. J Phys Chem Lett. 2015 Dec 17;6(24):4936-42. doi: 10.1021/acs.jpclett.5b02413. Epub 2015 Dec 02. PMID: 26606861.
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J Phys Chem Lett. 2015 Dec 17;6(24):4936-42. doi: 10.1021/acs.jpclett.5b02413. Epub 2015 Dec 02.

Multiple Dirac Points and Hydrogenation-Induced Magnetism of Germanene Layer on Al (111) Surface.

The journal of physical chemistry letters

G Liu, S B Liu, B Xu, C Y Ouyang, H Y Song, S Guan, Shengyuan A Yang

Affiliations

  1. Strong-field and Ultrafast Photonics Lab, Institute of Laser Engineering, Beijing University of Technology , Beijing 100124, China.
  2. College of Physics and Communication Electronics, Jiangxi Normal University , Nanchang 330022, China.
  3. Research Laboratory for Quantum Materials and EPD Pillar, Singapore University of Technology and Design , Singapore 487372, Singapore.
  4. School of Physics, Beijing Institute of Technology , Beijing 100081, China.

PMID: 26606861 DOI: 10.1021/acs.jpclett.5b02413

Abstract

A continuous germanene layer grown on the Al (111) surface has recently been achieved in experiment. In this work, we investigate its structural, electronic, and hydrogenation-induced properties through first-principles calculations. We find that despite having a different lattice structure from its free-standing form, germanene on Al (111) still possesses Dirac points at high-symmetry K and K' points. More importantly, there exist another three pairs of Dirac points on the K(K')-M high-symmetry lines, which have highly anisotropic dispersions due to the reduced symmetry. These massless Dirac Fermions become massive when spin-orbit coupling is included. Hydrogenation of the germanene layer strongly affects its structural and electronic properties. Particularly, when not fully hydrogenated, ferromagnetism can be induced due to unpaired local orbitals from the unsaturated Ge atoms. Remarkably, we discover that the one-side semihydrogenated germanene turns out to be a two-dimensional half-semimetal, representing a novel state of matter that is simultaneously a half-metal and a semimetal.

Keywords: Dirac point; germanene; graphene; semi-metal

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