Near-complete violation of Kirchhoff’s law in thermal radiation in ultrathin magnetic Weyl semimetal films

The ability to break Kirchhoff s law is of fundamental importance in thermal radiation. Various nonreciprocal emitters have been proposed to break the balance between absorption and emission. However, the thicknesses of the nonreciprocal materials are usually larger than 1/10 times of the wavelength. Besides, the previous proposed nonreciprocal emitters are complex, thus they can hardly be fabricated in experiment to verify the Kirchhoff s law for nonreciprocal materials. In this paper, we investigate the nonreciprocal thermal radiation of the magnetic Weyl semimetal (MWSM) film atop of the metal substrate. It is found that the strong nonreciprocal radiation at the wavelength of 9.15 {\mu}m can be achieved when the thickness of the MWSM film is 100 nm. The enhanced nonreciprocity is attributed to the Fabry-Perot resonances. The results indicate that the MWSM film is the promising candidate to engineer the ultrathin and simple nonreciprocal thermal emitters. What is perhaps most intriguing here is that the proposed structure can be more easily fabricated in experiment to verify the Kirchhoff s law for nonreciprocal materials.

[1]  Jun Wu,et al.  Strong dual-band nonreciprocal radiation based on a four-part periodic metal grating , 2021 .

[2]  S. Boriskina,et al.  Radiative heat and momentum transfer from materials with broken symmetries: opinion , 2021, Optical Materials Express.

[3]  Y. Zheng,et al.  Magnetic field-induced emissivity tuning of InSb-based metamaterials in the terahertz frequency regime , 2021, Optical Materials Express.

[4]  Linhua Liu,et al.  Nonreciprocal thermal radiation of nanoparticles via spin-directional coupling with reciprocal surface modes , 2021, Applied Physics Letters.

[5]  Xiaohu Wu,et al.  Enhanced nonreciprocal radiation in Weyl semimetals by attenuated total reflection , 2021, AIP Advances.

[6]  Xiaohu Wu,et al.  Strong nonreciprocal radiation in magnetophotonic crystals , 2021 .

[7]  Zhaoxian Chen,et al.  Strong Nonreciprocal Radiation in a InAs Film by Critical Coupling with a Dielectric Grating , 2021, ES Energy & Environment.

[8]  S. Fan,et al.  Transforming heat transfer with thermal metamaterials and devices , 2020, Nature Reviews Materials.

[9]  T. Kottos,et al.  Extreme Nonreciprocal Near-Field Thermal Radiation via Floquet Photonics. , 2020, Physical review letters.

[10]  Linhua Liu,et al.  Electromagnetic scattering, absorption and thermal emission by clusters of randomly distributed magneto-optical nanoparticles , 2020 .

[11]  Xin Qian,et al.  Intrinsic nonreciprocal reflection and violation of Kirchhoff's law of radiation in planar type-I magnetic Weyl semimetal surfaces , 2020 .

[12]  Yatao Ren,et al.  Giant thermal magnetoresistance driven by graphene magnetoplasmon , 2020, Applied Physics Letters.

[13]  Zhuomin M. Zhang,et al.  Validity of Kirchhoff's law for semitransparent films made of anisotropic materials , 2020 .

[14]  Z. Jacob,et al.  New spin-resolved thermal radiation laws for nonreciprocal bianisotropic media , 2019, New Journal of Physics.

[15]  M. Silveirinha,et al.  Nonlocal effects and enhanced nonreciprocity in current-driven graphene systems , 2019, 1912.01598.

[16]  Mingda Li,et al.  Large nonreciprocal absorption and emission of radiation in type-I Weyl semimetals with time reversal symmetry breaking , 2019, Physical Review B.

[17]  S. Fan,et al.  Axion-Field-Enabled Nonreciprocal Thermal Radiation in Weyl Semimetals. , 2019, Nano letters.

[18]  Xiaohu Wu.  The Promising Structure to Verify the Kirchhoff’s Law for Nonreciprocal Materials , 2020 .

[19]  S. Fan,et al.  Near-complete violation of Kirchhoff's law of thermal radiation with a 0.3  T magnetic field. , 2019, Optics letters.

[20]  C. Felser,et al.  Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co3Sn2S2 , 2019, Science.

[21]  R. Camley,et al.  Engineering terahertz surface magnon-polaritons in hyperbolic antiferromagnets , 2019, Physical Review B.

[22]  Andrea Alù,et al.  Nanophotonic engineering of far-field thermal emitters , 2018, Nature Materials.

[23]  R. Stamps,et al.  Oriented Asymmetric Wave Propagation and Refraction Bending in Hyperbolic Media , 2018, ACS Photonics.

[24]  C. Fu,et al.  Manipulation of enhanced absorption with tilted hexagonal boron nitride slabs , 2018 .

[25]  H. Weng,et al.  Large intrinsic anomalous Hall effect in half-metallic ferromagnet Co3Sn2S2 with magnetic Weyl fermions , 2017, Nature Communications.

[26]  C. Fu,et al.  Unidirectional transmission based on polarization conversion and excitation of magnetic or surface polaritons , 2017 .

[27]  Shanhui Fan,et al.  Universal modal radiation laws for all thermal emitters , 2017, Proceedings of the National Academy of Sciences.

[28]  Jason Soric,et al.  Breaking temporal symmetries for emission and absorption , 2016, Proceedings of the National Academy of Sciences.

[29]  S. Fan,et al.  Persistent Directional Current at Equilibrium in Nonreciprocal Many-Body Near Field Electromagnetic Heat Transfer. , 2016, Physical review letters.

[30]  Shanhui Fan,et al.  Near complete violation of detailed balance in thermal radiation , 2015, 2015 Conference on Lasers and Electro-Optics (CLEO).

[31]  W. C. Snyder,et al.  Thermodynamic Constraints on Reflectance Reciprocity and Kirchhoff's Law. , 1998, Applied optics.

[32]  W. Grill,et al.  Nonreciprocity in the optical reflection of magnetoplasmas , 1984 .