Dirac energy spectrum and inverted bandgap in metamorphic InAsSb/InSb superlattices
Abstract
A Dirac-type energy spectrum was demonstrated in gapless ultrashort-period metamorphic InAsSb/InSb superlattices by angle-resolved photoemission spectroscopy (ARPES) measurements. The Fermi velocity value of 7.4 × 105 m/s in a gapless superlattice with a period of 6.2 nm is in good agreement with the results of magnetoabsorption experiments. An “inverted” bandgap opens in the center of the Brillouin zone at higher temperatures and in the superlattice with a larger period. The ARPES data indicate the presence of a surface electron accumulation layer.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- Jan 21, 2020
- Source ID
- 10.1063/1.5128634
Entities
People
- Dmitry Smirnov
- G. Kipshidze
- Gregory Belenky
- M. M. Ermolaev
- Mykhaylo Ozerov
- Seongphill Moon
- Sergey Suchalkin
- Stefan P. Svensson
- Tonica Valla
- Wendy L. Sarney
- Yuxuan Jiang
- Zhigang Jiang
Organizations
- Army Research Office
- Brookhaven National Laboratory
- Division of Materials Research
- Florida State University
- Georgia Tech
- National High Magnetic Field Laboratory
- Stony Brook University
- United States Army Research Laboratory
- United States Department of Energy