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BiTeCl and BiTeBr: A comparative high-pressure optical study

机译:BiTeCl和BiTeBr:高压光学比较研究

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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 y across the band gap. In the low-pressure range, p < 4 GPa, for both compounds β is approximately constant with pressure and y 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 potential Weyl phase in BiTeBr at 5-6 GPa, followed by the onset of a structural phase transition above 7 GPa.
机译:我们在这里报告了BiTeCl和BiTeBr的详细高压红外透射研究。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,以及整个带隙的吸收y。在低压范围内,两种化合物的p <4 GPa,β随压力近似恒定,y减小,与能带结构计算一致。在BiT​​eCl中,以6 GPa的压力引起的明显相变会导致不同的基态。对于BiTeBr,压力变化更加微妙,我们讨论了带隙闭合和重新打开的可能性。我们的数据与BiTeBr中5-6 GPa的潜在Weyl相一致,随后出现高于7 GPa的结构相变。

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  • 来源
    《Physical review》 |2017年第4期|045201.1-045201.5|共5页
  • 作者单位

    GAP-Biophotonics, University of Geneva, CH-1211 Geneva 4, Switzerland;

    Synchrotron SOLEIL, L'Orme des Merisiers, BP48 Saint Aubin, 91192 Gif-sur-Yvette Cedex, France;

    DQMP, University of Geneva, CH-1211 Geneva 4, Switzerland;

    Institute of Physics, Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland,National Centre for Computational Design and Discovery of Novel Materials MARVEL,Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    Institute of Physics, Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    Institute of Physics, Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    Institute of Physics, Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    DQMP, University of Geneva, CH-1211 Geneva 4, Switzerland;

    Institute of Physics, Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland,National Centre for Computational Design and Discovery of Novel Materials MARVEL,Ecole Polytechnique Federate de Lausanne (EPFL), CH-1015 Lausanne, Switzerland;

    LNCMI, CNRS-UGA-UPS-INSA, 25, Avenue des Martyrs, 38042 Grenoble, France,Institute of Physics, Charles University in Prague, CZ-12116 Prague, Czech Republic;

    DQMP, University of Geneva, CH-1211 Geneva 4, Switzerland;

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