| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
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Giant Birefringence in Layered Compound LaOBiS2 |
| WANG Hai** |
College of Materials Science and Engineering, Tongji University, Shanghai 201804
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| Cite this article: |
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WANG Hai 2014 Chin. Phys. Lett. 31 047802 |
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Abstract Birefringent crystals (BFCs) have been extensively used in imaging spectrometers, laser devices, and optical components. Seeking new BFCs is important for both fundamental research and industrial applications. Employing first-principles density functional theory, we find that LaOBiS2 (space group: P4/nmm) appearing in the parent phase of the recently discovered BiS2-superconductor exhibits superior birefringence with a maximum value of 2.94, which is 13.4 times larger than the extensively used YVO4 (0.22). Furthermore, LaOBiS2 is an indirect semiconductor with a band gap of 0.9 eV, which is suitable for optical applications. The origin of giant inherent birefringence is also discussed.
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Received: 30 December 2013
Published: 25 March 2014
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| PACS: |
78.20.Fm
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(Birefringence)
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71.15.Mb
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(Density functional theory, local density approximation, gradient and other corrections)
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74.70.-b
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(Superconducting materials other than cuprates)
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74.25.Gz
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(Optical properties)
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