Temperature-driven massless Kane fermions in HgCdTe crystals
- Univ. of Montpellier (France)
- Univ. of Montpellier (France); Russian Academy of Sciences (RAS), Nizhny (Russian Federation)
- Univ. of Montpellier (France); Polish Academy of Sciences (PAS), Warsaw (Poland)
- Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab)
- Charles Univ., Prague (Czech Republic). Faculty of Mathematics and Physics; Lab. National des Champs Magnetiques Intenses, Grenoble (France)
- Georgia Inst. of Technology, Atlanta, GA (United States)
- Russian Academy of Sciences (RAS), Nizhny (Russian Federation); Lobachevsky State Univ. of Nizhny Novgorod (Russian Federation)
- Russian Academy of Sciences (RAS), Novosibirsk (Russian Federation); Novosibirsk State Univ. (Russian Federation)
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) × 106 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.
- Research Organization:
- Florida State Univ., Tallahassee, FL (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- FG02-07ER46451
- OSTI ID:
- 1361641
- Journal Information:
- Nature Communications, Vol. 7; ISSN 2041-1723
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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