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Dirac energy spectrum and inverted band gap in metamorphic InAsSb/InSb superlattices

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

preprint2019arXivOpen access
Sergey SuchalkinMaksim ErmolaevTonica VallaGela KipshidzeDmitry SmirnovSeongphill MoonMykhaylo OzerovZhigang JiangYuxuan JiangStefan P. SvenssonWendy L. SarneyGregory Belenky
cond-mat.mtrl-sciquant-ph
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Open access12 authors2 topics
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Sergey SuchalkinMaksim ErmolaevTonica VallaGela KipshidzeDmitry SmirnovSeongphill MoonMykhaylo OzerovZhigang JiangYuxuan JiangStefan P. SvenssonWendy L. SarneyGregory Belenky

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