Mechanical and Thermal Properties

Martyniuk, Mariusz; Dell, John; Faraone, Lorenzo

doi:10.1002/9780470669464.ch8

Cited by 2 publications

(5 citation statements)

References 177 publications

(372 reference statements)

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“…Similar to the pseudospin-1 Dirac–Weyl system 9 , their energy dispersion relation features cones crossed at the vertex by an additional flat band. The bandgap and the electronic dispersion in Hg 1− x Cd x Te can be tuned intrinsically by adjusting the chemical composition, or externally, by changing temperature 10 . The ability to control the properties of quasiparticles with relativistic behaviour in a tabletop condensed-matter experiment holds vast scientific and technological potential.…”

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confidence: 99%

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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confidence: 99%

Temperature-driven massless Kane fermions in HgCdTe crystals

et al. 2016

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“…Furthermore, it is below the predicted bulk alloy limit for Hg 1-x Cd x Te over the range x = 0 to 0. 4 20 Lines are from models, while points are measured data.…”

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confidence: 99%

“…5. 20 Therefore, contributions of diffusive phonon transport to thermal conductivity in the MCT SLs are likewise expected to be relative temperature-independent. Fig.…”

Section: -4mentioning

confidence: 99%

“…The total thermal resistance is then the sum of the resistances of each layer and the boundary resistances. Using C Hg0.75Cd0.25Te = 29 J/mol·K, C Hg0.2Cd0.8Te = 27 J/mol·K, and v = (C 11 /ρ) 1/2 (where the elastic stiffness constant C 11 is 56GPa), 20 the calculated diffuse and acoustic mismatch limits are 1.28 W/mK and 1.42 W/mK at room temperature. Both are higher than the value derived from the measurement above, which is 0.91 W/m·K.…”

Section: -4mentioning

confidence: 99%

“…5. Relative specific heats of bulk forms of MCT SL components versus temperature, 20 Debye temperature of HgTe and CdTe, 20 and measured MCT SL thermal conductivity. …”

Section: -4mentioning

confidence: 99%

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Thermoelectric properties of MBE-grown HgCdTe-based superlattices from 100K to 300K

et al. 2016

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We report on the thermoelectric properties of long-period HgCdTe superlattices (MCT SLs) from cryogenic temperature to room temperature. We find that the thermal conductivity is lower than the alloy value especially at low temperatures, the electrical conductivity is similar to that of alloy films, and the Seebeck coefficient is comparable to other SLs. Calculations based on Rytov’s elastic model show that the phonon group velocity is reduced due to folding by more than a factor of two relative to its value in bulk CdTe or HgTe. Thermal conductivity is found to be relatively constant over a wide range of temperatures.

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Mechanical and Thermal Properties

Cited by 2 publications

References 177 publications

Temperature-driven massless Kane fermions in HgCdTe crystals

Temperature-driven massless Kane fermions in HgCdTe crystals

Thermoelectric properties of MBE-grown HgCdTe-based superlattices from 100K to 300K

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