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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Proc+Natl+Acad+Sci+U+S+A 2017 ; 114 (5): 816-21 Nephropedia Template TP
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Spectroscopic evidence for bulk-band inversion and three-dimensional massive Dirac fermions in ZrTe5 #MMPMID28096330
Proc Natl Acad Sci U S A 2017[Jan]; 114 (5): 816-21 PMID28096330show ga
Experimental verifications of the theoretically predicted topological insulators (TIs) are essential steps toward the applications of the topological quantum phenomena. In the past, theoretically predicted TIs were mostly verified by the measurements of the topological surface states. However, as another key feature of the nontrivial topology in TIs, an inversion between the bulk bands has rarely been observed by experiments. Here, by studying the optical transitions between the bulk LLs of ZrTe5, we not only offer spectroscopic evidence for the bulk-band inversion?the crossing of the two zeroth LLs in a magnetic field, but also quantitatively demonstrate three-dimensional massive Dirac fermions with nearly linear band dispersions in ZrTe5. Our investigation provides a paradigm for identifying TI states in candidate materials.