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Generic Symmetry Breaking Instability of Topological Insulators due to a Novel van Hove Singularity
Xu-Gang He, Xiaoxiang Xi, Wei Ku
We point out that in the deep band-inverted state, topological insulators are generically vulnerable against symmetry breaking instability, due to a divergently large density of st…
A broadband silicon quarter-wave retarder for far-infrared spectroscopic circular dichroism
Xiaoxiang Xi, R. J. Smith, T. N. Stanislavchuk +4
The high brightness, broad spectral coverage and pulsed characteristics of infrared synchrotron radiation enable time-resolved spectroscopy under throughput-limited optical systems…
Bulk Signatures of Pressure-Induced Band Inversion and Topological Phase Transitions in PbSnSe
Xiaoxiang Xi, Xu-Gang He, Fen Guan +10
The characteristics of topological insulators are manifested in both their surface and bulk properties, but the latter remain to be explored. Here we report bulk signatures of pres…