Journal
NANOSCALE
Volume 10, Issue 47, Pages 22263-22269Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c8nr07501h
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Funding
- National Natural Science Foundation of China [11274380, 91433103, 11622437, 61674171, 61761166009]
- Fundamental Research Funds for the Central Universities of China [16XNLQ01]
- Research Funds of Renmin University of China [16XNLQ01]
- Strategic Priority Research Program of Chinese Academy of Science [XDB30000000]
- Research Grant Council of Hong Kong [N_PolyU540/17]
- Hong Kong Polytechnic University [G-SB53]
- Outstanding Innovative Talents Cultivation Funded Programs 2017 of Renmin University of China
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Few-layer tellurium is an emerging quasi-one-dimensional layered material. The striking feature of Te is its presence as various few-layer allotropes (-). Although these allotropes offer substantially different physical properties, only the phase has been synthesized in neutral few-layers as it is so far the most stable few-layer form. Herein, we show that hole or electron doping could maintain a certain Te phase. The , , and phases appear as the most stable forms of Te bilayer, in sequence, with bandgap variations over 1 eV. In Te trilayer, a novel metallic chiral + phase emerges, leading to the appearance of chirality. Transitions among these phases, understood at the wavefunction level, are accompanied by the emergence or elimination of inversion centers (-, -, - + ), structural anisotropy (-, -) and chirality (- + ), which could result in substantial changes in optical and other properties. In light of these findings, our work opens a new avenue for stabilizing different allotropes of layered materials; this is crucial for using their outstanding properties. This study also suggests the possibility of building mono-elemental electronic and optoelectronic heterostructures or devices, which are attractive for future applications in electronics.
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