The properties and applications of the Hg1−xCdxTe alloy system

Dornhaus, Ralf; Nimtz, G.

doi:10.1007/bfb0044921

Cited by 66 publications

(10 citation statements)

References 484 publications

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“…Therefore, this universal value of allows for determination of the particle rest mass for bandgap values in the vicinity of the semimetal-to-semiconductor phase transition induced by temperature, Cd content or other external parameter (for example, pressure). Figure 4c shows the variation of the experimental bandgap energy obtained in this work (full blue and red points) and from previous studies212324 (open symbols), as a function of the rest mass, using and the universal value of .…”

Section: Resultsmentioning

confidence: 83%

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Temperature-driven massless Kane fermions in HgCdTe crystals

et al. 2016

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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.

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Section: Resultsmentioning

confidence: 83%

“…Orange and purple points correspond to experimental results obtained in this work, whereas open symbols are experimental points from refs 21, 23, 24. ( a ) Rest mass values for both samples are determined by fitting magneto-optical data with the simplified model, including the Γ 6 and Γ 8 bands only.…”

Section: Figurementioning

confidence: 99%

Temperature-driven massless Kane fermions in HgCdTe crystals

et al. 2016

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“…The material parameters for MCT are taken from the references [13,21]. For hyperbolic band structure the constants are taken as, = 48.3 × 10 −20 2 and c = 0.058e [12].…”

Section: Resultsmentioning

confidence: 99%

Comparative studies on the electronic transport in magnetically quantized low band gap semiconductor system

Shrestha

Sarkar

2020

BIBECHANA

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The Q1D system formed by magnetically confined system is attracting attention of researchers in device application because it is capable of over-looking the various techniques of fabrication difficulties and defects created by such fabrication techniques. In the presence of a high magnetic field, the transverse component of the energy dispersion relation gets quantized into various equally spaced energy levels called Landau levels and the motion of the carriers is completely restricted. However, the longitudinal component along the field is still free to move. The mobility of such system is enhanced when a low effective mass semiconductors n-HgCdTe (Mercury Cadmium Telluride) is used. The band structure of n-HgCdTe is found to be nonparabolic due to its low band gap according to Kane [Phadke and Sharma, 1975]. Recent publications, based on experimental verifications of transport coefficient of n-HgCdTe of Chen and Sher [Chen and Sher, 1982] show that the band structure of Mercury Cadmium Telluride (MCT) is more hyperbolic in nature rather than nonparabolic. The author has compared the effect of band structures on the various transport properties of MCT such as mobility, Seebeck coefficient, thermal conductivity, figure of merit (Z) etc. The figure of merit is a very important property of a material to be used in thermoelectric devices, such as cooler, refrigerator etc. The product of Z and temperature i.e. (ZT), a dimensionless quantity is found to be maximum for parabolic band structure and is followed by nonparabolic and hyperbolic band structures for all ranges of variation of temperature as well as magnetic field. Taking the hyperbolic band structure of MCT, the effect of high and low temperature scattering mechanisms on ZT is also observed. BIBECHANA 17 (2020) 34-41

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“…At the present time Hg 1−x Cd x Te (CMT) is the basic semiconductor material for manufacturing IR radiation detectors over a wide spectral range (1-14 m), especially in a long-wave window 8-14 m [1]. At the same time, Hg 1−x Cd x Te has a variety of serious shortcomings.…”

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confidence: 99%