A gap-protected zero-Hall effect state in the quantum limit of the nonsymmorphic metal KHgSb
arXiv:1812.11912 · doi:10.1038/s41563-019-0303-x
Abstract
A recurring theme in topological matter is the protection of unusual electronic states by symmetry, for example, protection of the surface states in Z2 topological insulators by time reversal symmetry [1-3]. Recently interest has turned to unusual surface states in the large class of nonsymmorphic materials [4-11]. In particular KHgSb is predicted to exhibit double quantum spin Hall (QSH) states [10]. Here we report observation of a novel feature of the Hall conductivity in KHgSb in strong magnetic field B. In the quantum limit, the Hall conductivity is observed to fall exponentially to zero, but the diagonal conductivity is finite. A large gap protects this unusual zero-Hall state. We propose that, in this limit, the chemical potential drops into the bulk gap, intersecting equal numbers of right and left-moving QSH surface modes to produce the zero-Hall state.
arXiv comment7 pages, 4 figures
References in corpus (15)
- Anomalous Hall effect
- Topological Insulators in Three Dimensions
- Topological Insulators with Inversion Symmetry
- Topological Field Theory of Time-Reversal Invariant Insulators
- Quantum Transport in Semiconductor Nanostructures
- Dirac Cone Protected by Non-Symmorphic Symmetry and 3D Dirac Line Node in ZrSiS
- Dirac Semimetals in Two Dimensions
- Topology of crystalline insulators and superconductors
- Hourglass Fermions
- New classes of topological crystalline insulators with unpinned surface Dirac cones
- Topological Order and Absence of Band Insulators at Integer Filling in Non-Symmorphic Crystals
- Z2-topology in nonsymmorphic crystalline insulators: Mobius twist in surface states
- Topological non-symmorphic crystalline insulators
- Experimental Discovery of the First Nonsymmorphic Topological Insulator KHgSb
- Wallpaper Fermions and the Nonsymmorphic Dirac Insulator
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