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2016 ; 7
(ä): 12576
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Temperature-driven massless Kane fermions in HgCdTe crystals
#MMPMID27573209
Teppe F
; Marcinkiewicz M
; Krishtopenko SS
; Ruffenach S
; Consejo C
; Kadykov AM
; Desrat W
; But D
; Knap W
; Ludwig J
; Moon S
; Smirnov D
; Orlita M
; Jiang Z
; Morozov SV
; Gavrilenko VI
; Mikhailov NN
; Dvoretskii SA
Nat Commun
2016[Aug]; 7
(ä): 12576
PMID27573209
show ga
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.