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Title: Intrinsic magnetism and spontaneous band gap opening in bilayer silicene and germanene

Abstract

It has been long sought to create magnetism out of simple non-magnetic materials, such as silicon and germanium. Here we show that intrinsic magnetism exists in bilayer silicene and germanene with no need to cut, etch, or dope. Unlike bilayer graphene, strong covalent interlayer bonding formed in bilayer silicene and germanene breaks the original π-bonding network of each layer, leaving the unbonded electrons unpaired and localized to carry magnetic moments. These magnetic moments then couple ferromagnetically within each layer while antiferromagnetically across two layers, giving rise to an infinite magnetic sheet with structural integrity and magnetic homogeneity. Furthermore, this unique magnetic ordering results in fundamental band gaps of 0.55 eV and 0.32 eV for bilayer silicene and germanene, respectively. The integration of intrinsic magnetism and spontaneous band gap opening makes bilayer silicene and germanene attractive for future nanoelectronics as well as spin-based computation and data storage.

Authors:
 [1]; ORCiD logo [1]
  1. Colorado School of Mines, Golden, CO (United States). Dept. of Physics
Publication Date:
Research Org.:
Lawrence Berkeley National Laboratory-National Energy Research Scientific Computing Center
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1491010
DOE Contract Number:  
SC0006433
Resource Type:
Journal Article
Journal Name:
Physical Chemistry Chemical Physics
Additional Journal Information:
Journal Volume: 19; Journal Issue: 3; Journal ID: ISSN 1463-9076
Country of Publication:
United States
Language:
English

Citation Formats

Wang, Xinquan, and Wu, Zhigang. Intrinsic magnetism and spontaneous band gap opening in bilayer silicene and germanene. United States: N. p., 2017. Web. doi:10.1039/c6cp07184h.
Wang, Xinquan, & Wu, Zhigang. Intrinsic magnetism and spontaneous band gap opening in bilayer silicene and germanene. United States. doi:10.1039/c6cp07184h.
Wang, Xinquan, and Wu, Zhigang. Sun . "Intrinsic magnetism and spontaneous band gap opening in bilayer silicene and germanene". United States. doi:10.1039/c6cp07184h.
@article{osti_1491010,
title = {Intrinsic magnetism and spontaneous band gap opening in bilayer silicene and germanene},
author = {Wang, Xinquan and Wu, Zhigang},
abstractNote = {It has been long sought to create magnetism out of simple non-magnetic materials, such as silicon and germanium. Here we show that intrinsic magnetism exists in bilayer silicene and germanene with no need to cut, etch, or dope. Unlike bilayer graphene, strong covalent interlayer bonding formed in bilayer silicene and germanene breaks the original π-bonding network of each layer, leaving the unbonded electrons unpaired and localized to carry magnetic moments. These magnetic moments then couple ferromagnetically within each layer while antiferromagnetically across two layers, giving rise to an infinite magnetic sheet with structural integrity and magnetic homogeneity. Furthermore, this unique magnetic ordering results in fundamental band gaps of 0.55 eV and 0.32 eV for bilayer silicene and germanene, respectively. The integration of intrinsic magnetism and spontaneous band gap opening makes bilayer silicene and germanene attractive for future nanoelectronics as well as spin-based computation and data storage.},
doi = {10.1039/c6cp07184h},
journal = {Physical Chemistry Chemical Physics},
issn = {1463-9076},
number = 3,
volume = 19,
place = {United States},
year = {2017},
month = {1}
}

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