Tunable Line Node Semimetals

Abstract

Weyl semimetals are examples of a new class of topological states of matter which are gapless in the bulk with protected surface states. Their low energy sector is characterized by massless chiral fermions which are robust against translationally invariant perturbations. A variant of these systems have two non-degenerate bands touching along lines rather than points. A proposal to realize such a phase involves alternating layers of topological insulators and magnetic insulators, where the magnetization lies perpendicular to the symmetry axis of the heterostructure. The shape, size and the dispersion in the vicinity of the nodal lines varies with the strength of the magnetization, offering a new knob to control the properties of the system. In this paper we map out the evolution of the nodal lines and the dependence of the conductivity on magnetization and identify signatures of the low energy sector in quantum oscillation measurements.

8 pages, 17 figures. Accepted for publication in PRB

References in corpus (5)

• Quantum Spin Hall Insulator State in HgTe Quantum Wells
• Superconducting proximity effect and Majorana fermions at the surface of a topological insulator
• Three dimensional topological invariants for time reversal invariant Hamiltonians and the three dimensional quantum spin Hall effect
• Surface States of the Topological Insulator Bi_{1-x}Sb_x
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• Observation of Dirac-like energy band and ring-torus Fermi surface associated with the nodal line in topological insulator CaAgAs
• Tunable point nodes from line node semimetals via application of light
• Topologically stable gapless phases in nonsymmorphic superconductors
• Transport and optics at the node in a nodal loop semimetal
• Magnetic susceptibility of topological nodal semimetals
• Line nodes and surface Majorana flat bands in static and kicked p-wave superconducting Harper model
• Topological Nodal-Line Fermions in the Non-Centrosymmetric Superconductor Compound PbTaSe2
• Intrinsic large gap quantum anomalous Hall insulators in La$X$ ($X$=Br, Cl, I)
• Nodal-line semimetals from Weyl superlattices
• Phonons and elasticity in critically coordinated lattices