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О новом типе безмассовых дираковских фермионов в кристаллических топологических изоляторахстатья
Дата последнего поиска статьи во внешних источниках: 28 мая 2015 г.
- Авторы: Молотков С.Н., Потапова Т.А.
- Журнал: JETP Letters
- Том: 98
- Номер: 5
- Год издания: 2013
- Издательство: Maik Nauka/Interperiodica Publishing
- Местоположение издательства: Russian Federation
- Первая страница: 336
- Последняя страница: 341
- Аннотация: A new type of massless Dirac fermions in crystalline threedimensional topological insulators (threedimen sional twodimensional situation) has been predicted. The spectrum has fourfold degeneracy at the top of the twodimensional Brillouin zone (M point) and twofold degeneracy near the M point. Crystal symmetry along with the time reversal invariance in threedimensional topological insulators allows fourfold degenerate Dirac cones, which are absent in the classification of topological features in R.J. Slager et al., Nat. Phys. 9, 98 (2013). The Hamiltonian in the cited work does not contain Dirac singularities with more than twofold degeneracy. For this reason, the corresponding topological classification is incomplete. The longitudinal magnetic field in the spinless case holds the massless dispersion law of fermions and does not lift fourfold degeneracy. In the spinor case, the magnetic field lifts fourfold degeneracy, holding only twofold degeneracy, and results in the appearance of a band gap in the spectrum of fermions.
- Добавил в систему: молотков сергей николаевич