<b>Anisotropic thermal transport in bulk hexagonal boron nitride</b>

Jiang, Puqing; Qian, Xin; Yang, Ronggui; Lindsay, Lucas

doi:10.1103/physrevmaterials.2.064005

Cited by 91 publications

(123 citation statements)

References 68 publications

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“…Defects in hBN with ZPLs near 2.21 eV remain poorly classified 16 , but the results discussed here are relevant to broad classes of defects in hBN. Phonon sidebands were observed redshifted by 166, 177, 200, 326, 343, 359 and 395 meV from the ZPL in agreement with experimental and ab initio calculations of the phonon dispersion for hBN [17][18][19][20][21] .…”

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confidence: 83%

Phonon-induced multicolor correlations in hBN single-photon emitters

et al. 2019

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Color centers in hexagonal boron nitride have shown enormous promise as single-photon sources, but a clear understanding of electron-phonon interaction dynamics is critical to developing the material for quantum communications or quantum simulations. We demonstrate photon antibunching in the filtered auto-and cross-correlations g (2) lm (τ) between zero-, one-and two-phonon replicas of defect luminescence. Moreover, we combine a violation of the Cauchy-Schwarz inequality and a phenomenological model of the phonon-mediated emission cross-section to distinguish a low quantum-efficiency defect from phonon replicas of a bright defect. With no background correction, we observe single photon purity of g (2) (0) = 0.20 in a phonon replica and cross-spectral correlations of g (2) lm (0) = 0.18 between a phonon replica and the zero phonon line, the first experimental measure of photon correlations between a zero-phonon line and optical-phonon replicas in a solid-state single-photon emitter.

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confidence: 83%

Phonon-induced multicolor correlations in hBN single-photon emitters

et al. 2019

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“…Raising the temperature excites a larger number of energy states and also shifts thermal energy peak towards higher frequencies according to the Wien's displacement law, which will be further discussed. We notice that the measured thermal conductivity at 300 K is in good agreement with the literature data . At this temperature, the radiative contribution is relatively small.…”

Section: Resultssupporting

confidence: 90%

“…Given these considerations, the extracted k Phonon,exp is in a reasonable agreement with the expected 1/ T trend. On the other hand, we also notice a recent study on the out‐of‐plane thermal conductivity of hBN which showed that thermal conductivity does not follow 1/ T in a temperature range between over 100 and 400 K . This deviation was attributed to the contribution of high‐frequency acoustic phonons which do not follow the 1/ T trend at temperatures below 400 K. At temperatures above 400 K, however, the contribution of high‐frequency phonons also decreases with temperature, resulting in ≈1/ T trend in phonon thermal conductivity.…”

Section: Resultsmentioning

confidence: 45%

“…From the heat transfer perspective, the dominant in‐plane phonon interactions yield high bulk thermal conductivity, ≈400 W m −1 K −1 at room temperature, which decreases with the well‐known 1/ T trend due to the intrinsic Umklapp scattering . Weak phonon interactions from van der Waals forces in the out‐of‐plane direction result in a thermal conductivity of about 5 W m −1 K −1 in bulk hBN . Along the out‐of‐plane direction, propagation of phonon‐polaritons with high‐κ modes can contribute to appreciable thermal transport.…”

Section: Introductionmentioning

confidence: 99%

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Energy Transport by Radiation in Hyperbolic Material Comparable to Conduction

Salihoglu

Iyer

Taniguchi

et al. 2019

Adv Funct Materials

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Radiation as a heat transfer mode inside a bulk material is usually negligible in comparison to conduction. Here, the contribution of radiation to energy transport inside a hyperbolic material, hexagonal boron nitride (hBN), is investigated. With hyperbolic dispersion, i.e., opposite signs of dielectric components along principal directions, phonon polaritons contribute significantly to energy transport due to a much greater number of propagating modes compared to that in a normal material. A many-body model is developed to account for radiative heat transfer in a material with a nonuniform temperature distribution. The total radiative heat transfer through hBN is found to be largely contributed by the high-κ modes within the Reststrahlen bands, and is comparable to phonon conduction. Experimental measurements of temperature-dependent thermal transport also show that radiative contribution to thermal transport is of the same order as that from phonons. Therefore, this work shows, for the first time, radiative heat transfer inside a material can be comparable to phonon conductive heat transfer.

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“…19 The uncertainties of Kz, K||(θ) and G are then estimated using a multivariate error propagation formalism based on Jacobi matrices, which was first developed by Yang et al 20 and widely used in some related works. [21][22][23][24] The effect of the signal noise, manifested as the standard deviation σ between the measured data points and the thermal model prediction, is also included in the estimated uncertainty. Figure 1(d) shows that from a typical elliptical-beam TDTR measurement, Kz and K||(θ) of β-Ga2O3 can usually be determined with an uncertainty of 11% and 15%, respectively.…”

Section: Textmentioning

confidence: 99%

Three-dimensional anisotropic thermal conductivity tensor of single crystalline β-Ga2O3

Jiang

Qian

et al. 2018

Applied Physics Letters

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β-Ga2O3 has attracted considerable interest in recent years for high power electronics, where thermal properties of β-Ga2O3 play a critical role. The thermal conductivity of β-Ga2O3 is expected to be three-dimensionally (3D) anisotropic due to the monoclinic lattice structure. In this work, the 3D anisotropic thermal conductivity tensor of a (010)-oriented β-Ga2O3 single crystal was measured using a recently developed elliptical-beam time-domain thermoreflectance (TDTR) method. Thermal conductivity along any direction in the (010) plane as well as the one perpendicular to the (010) plane can be directly measured, from which the 3D directional distribution of the thermal conductivity can be derived. Our measured results suggest that at room temperature, the highest in-plane thermal conductivity is along a direction between [001] and [102], with a value of 13.3±1.8 W m -1 K -1 , and the lowest in-plane thermal conductivity is close to the [100] direction, with a value of 9.5±1.8 W m -1 K -1 . The through-plane thermal conductivity, which is along the [010] direction, has the highest value of 22.5±2.5 W m -1 K -1 among all the directions.Temperature-dependent thermal conductivity of β-Ga2O3 was also measured and compared with a theoretical model calculation to understand the temperature dependence and the role of impurity scattering. a xbli35@hust.edu.cn b Ronggui.Yang@Colorado.Edu

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Anisotropic thermal transport in bulk hexagonal boron nitride

Cited by 91 publications

References 68 publications

Phonon-induced multicolor correlations in hBN single-photon emitters

Phonon-induced multicolor correlations in hBN single-photon emitters

Energy Transport by Radiation in Hyperbolic Material Comparable to Conduction

Three-dimensional anisotropic thermal conductivity tensor of single crystalline β-Ga2O3

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