变质InAsSb/InSb超晶格的Dirac能谱和反转带隙
Dirac energy spectrum and inverted band gap in metamorphic InAsSb/InSb superlattices
摘要：
用角分辨光电子能谱（ARPES_ measurements）研究了InAsSb/InSb超晶格的Dirac型能谱。在周期为6.2nm的无带隙超晶格中，费米速度值为7.4 × 10^5 m/s，与磁吸收实验结果符合得很好。在较高温度下，布里渊区的中心和具有较大周期的SL中，“反转”带隙打开。ARPES数据表明表面存在电子积累层
英文摘要：
A Dirac-type energy spectrum was demonstrated in gapless ultra-short-period metamorphic InAsSb/InSb superlattices by angle-resolved photoemission spectroscopy (ARPES_ measurements. The Fermi velocity value 7.4x10^5 m/s in a gapless superlattice with a period of 6.2nm is in a good agreement with the results of magneto-absorption experiments. An "inverted" bandgap opens in the center of the Brillouin zone at higher temperatures and in the SL with a larger period. The ARPES data indicate the presence of a surface electron accumulation layer
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