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Dimensional crossover in topological matter: Evolution of the multiple Dirac point in the layered system to the flat band on the surface
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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.
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Cited by 1 Pith paper
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The Dirac nodal line network in non-symmorphic rutile semimetal RuO$_2$
Micro-ARPES resolves two predicted Dirac nodal lines in RuO2 and reveals a third band crossing along XR that anchors a flat-band surface state.
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