Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2010-11-18
Pisma Zh.Eksp.Teor.Fiz.93:63-68,2011; JETP Lett.93:59-65,2011
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 7 figures
Scientific paper
10.1134/S002136401102007X
We consider the dimensional crossover in the topological matter, which involves the transformation of different types of topologically protected zeroes in the fermionic spectrum. In the considered case, the multiple Dirac (Fermi) point in quasi 2-dimensional system evolves into the flat band on the surface of the 3-dimensional system when the number of atomic layers increases. This is accompanied by formation of the spiral nodal lines in the bulk. We also discuss the topological quantum phase transition at which the surface flat band shrinks and changes its chirality, while the nodal spiral changes its helicity.
Heikkila Tero T.
Volovik Grigori E.
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