BiTeCl和BiTeBr：高压光学比较研究
BiTeCl and BiTeBr: a comparative high-pressure optical study
摘要：
我们在这里报告了详细的高压红外透射研究BiTeCl和BiTeBr。我们遵循两个带跃迁的演变：两个Rashba分裂导带之间的光激发$β$，和吸收$γ$跨越带隙。在低压范围内，$p< 4$ ~GPa，对于两种化合物，$β$随压力近似恒定，而$γ$随压力减小，与能带结构计算一致。在BiTeCl中，在6~GPa压力下发生明显的压力诱导相变，导致不同的基态。对于BiTeBr，压力的演变是更加微妙的，我们讨论了关闭和重新打开的带隙的可能性。我们的数据与BiTeBr在5 $-$ 6 GPa时的Weyl相一致，随后在7 GPa时发生结构相变。
英文摘要：
We here report a detailed high-pressure infrared transmission study of BiTeCl and BiTeBr. We follow the evolution of two band transitions: the optical excitation $β$ between two Rashba-split conduction bands, and the absorption $γ$ across the band gap. In the low pressure range, $p< 4$~GPa, for both compounds $β$ is approximately constant with pressure and $γ$ decreases, in agreement with band structure calculations. In BiTeCl, a clear pressure-induced phase transition at 6~GPa leads to a different ground state. For BiTeBr, the pressure evolution is more subtle, and we discuss the possibility of closing and reopening of the band gap. Our data is consistent with a Weyl phase in BiTeBr at 5$-$6~GPa, followed by the onset of a structural phase transition at 7~GPa.
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