Dirac energy spectrum and inverted band gap in metamorphic InAsSb/InSb superlattices
Sergey Suchalkin, Maksim Ermolaev, Tonica Valla, Gela Kipshidze,, Dmitry Smirnov, Seongphill Moon, Mykhaylo Ozerov, Zhigang Jiang, Yuxuan, Jiang, Stefan P. Svensson, Wendy L. Sarney, Gregory Belenky
TL;DR
This study demonstrates a Dirac-type energy spectrum and inverted band gap in metamorphic InAsSb/InSb superlattices, revealing surface electron accumulation and aligning ARPES and magneto-absorption results.
Contribution
It provides new insights into the electronic structure of InAsSb/InSb superlattices, including Dirac spectrum realization and temperature-dependent band inversion.
Findings
Dirac-type energy spectrum observed via ARPES
Fermi velocity of 7.4x10^5 m/s in gapless superlattice
Inverted bandgap appears at higher temperatures and larger periods
Abstract
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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