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Temperature-driven massless Kane fermions in HgCdTe crystals.

Title: Temperature-driven massless Kane fermions in HgCdTe crystals.
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Name(s): Teppe, F, author
Marcinkiewicz, M, author
Krishtopenko, S S, author
Ruffenach, S, author
Consejo, C, author
Kadykov, A M, author
Desrat, W, author
But, D, author
Knap, W, author
Ludwig, J, author
Moon, S, author
Smirnov, D, author
Orlita, M, author
Jiang, Z, author
Morozov, S V, author
Gavrilenko, V I, author
Mikhailov, N N, author
Dvoretskii, S A, author
Type of Resource: text
Genre: Journal Article
Text
Date Issued: 2016-08-30
Physical Form: computer
online resource
Extent: 1 online resource
Language(s): English
Abstract/Description: It has recently been shown that electronic states in bulk gapless HgCdTe offer another realization of pseudo-relativistic three-dimensional particles in condensed matter systems. These single valley relativistic states, massless Kane fermions, cannot be described by any other relativistic particles. Furthermore, the HgCdTe band structure can be continuously tailored by modifying cadmium content or temperature. At critical concentration or temperature, the bandgap collapses as the system undergoes a semimetal-to-semiconductor topological phase transition between the inverted and normal alignments. Here, using far-infrared magneto-spectroscopy we explore the continuous evolution of band structure of bulk HgCdTe as temperature is tuned across the topological phase transition. We demonstrate that the rest mass of Kane fermions changes sign at critical temperature, whereas their velocity remains constant. The velocity universal value of (1.07±0.05) × 10(6) m s(-1) remains valid in a broad range of temperatures and Cd concentrations, indicating a striking universality of the pseudo-relativistic description of the Kane fermions in HgCdTe.
Identifier: FSU_pmch_27573209 (IID), 10.1038/ncomms12576 (DOI), PMC5013552 (PMCID), 27573209 (RID), 27573209 (EID), ncomms12576 (PII)
Publication Note: This NIH-funded author manuscript originally appeared in PubMed Central at https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5013552.
Persistent Link to This Record: http://purl.flvc.org/fsu/fd/FSU_pmch_27573209
Host Institution: FSU
Is Part Of: Nature communications.
2041-1723
Issue: vol. 7

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Teppe, F., Marcinkiewicz, M., Krishtopenko, S. S., Ruffenach, S., Consejo, C., Kadykov, A. M., … Dvoretskii, S. A. (2016). Temperature-driven massless Kane fermions in HgCdTe crystals. Nature Communications. Retrieved from http://purl.flvc.org/fsu/fd/FSU_pmch_27573209