Three-dimensional quasi-quantized Hall insulator phase in SrSi2

Abstract

In insulators, the longitudinal resistivity becomes infinitely large at zero temperature. For classic insulators, the Hall conductivity becomes zero at the same time. However, there are special systems, such as two-dimensional quantum Hall isolators, in which a more complex scenario is observed at high magnetic fields. Here, we report experimental evidence for a quasi-quantized Hall insulator in the quantum limit of the three-dimensional semimetal SrSi2. Our measurements reveal a magnetic field-range, in which the longitudinal resistivity diverges with decreasing temperature, while the Hall conductivity approaches a quasi-quantized value that is given only by the conductance quantum and the Fermi wave vector in the field-direction. The quasi-quantized Hall insulator appears in a magnetic-field induced insulating ground state of three-dimensional materials and is deeply rooted in quantum Hall physics.

29 pages including SI, 3 main figures and 6 SI figures

References in corpus (7)

• Quantum Hall effect in a bulk antiferromagnet EuMnBi${}_2$ with magnetically confined two-dimensional Dirac fermions
• Origin of the quasi-quantized Hall effect in ZrTe5
• Approaching Three-Dimensional Quantum Hall effect in Bulk HfTe5
• Bulk quantum Hall effect of spin-valley-coupled Dirac fermions in a polar antiferromagnet BaMnSb${}_2$
• Quantum critical behaviour of the plateau-insulator transition in the quantum Hall regime
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• Theory of the Quantum Hall Insulator

Cited by in corpus (2)

• Observation of pressure-induced Weyl state and superconductivity in a chirality-neutral Weyl semimetal candidate SrSi2
• Optical conductivity and band gap in the double-Weyl candidate SrSi2 at ambient pressure