Giant birefringence in layered compound LaOBiS2

Abstract

Birefringent crystals (BFC) have been extensively used in imaging spectrometer, laser devices, and optical components. Seeking new BFC is of important for both fundamental research and industrial application. Employed first-principles density functional theory (DFT), we found that LaOBiS2 (space group P4/nmm), the parent phase of 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 discussed.

10 pages, 4 figures

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Cited by in corpus (4)

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• Structures and Optical Absorption of Bi2OS2 and LaOBiS2
• Compositional and temperature evolution of crystal structure of new thermoelectric compound LaOBiS2-xSex
• Layered compounds AFBiS2: superior birefringent crystals