المؤلفون: Mukherjee, A., Seo, J., Arik, M. M., Zhang, H., Zhang, C., Kirzhner, T., George, D. K., Markelz, A. G., Armitage, N. P., Koren, G., Wei, J. Y. T., Cerne, J.

مصطلحات موضوعية: Condensed Matter - Superconductivity

الوصف: By measuring the polarization changes in THz, infrared, and visible radiation over an extended energy range (3-2330 meV), we observe symmetry-breaking in cuprate high temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation and ellipticity of transmitted radiation though thin films as the sample is rotated. We observe a two-fold rotational symmetry in the Faraday angle, which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the mid-infrared optical feature that has been associated with the formation of the pseudogap state. The strongest LD signal is found in under-doped films, although it is also observed in optimally- and over-doped samples. The LD signal is consistent with nematic charge ordering as well as novel magnetoelectric effects. ; Comment: 10 pages, 4 figures

العلاقة: http://arxiv.org/abs/1907.08649Test; Phys. Rev. B 102, 054520 (2020)

الإتاحة: https://doi.org/10.1103/PhysRevB.102.054520Test
http://arxiv.org/abs/1907.08649Test

المؤلفون: Mukherjee, A., Ellis, C. T., Arik, M. M., Taheri, P., Oliverio, E., Fowler, P., Tischler, J. G., Liu, Y., Glaser, E. R., Myers-Ward, R. L., Tedesco, J. L., Eddy Jr, C. R., Gaskill, D. Kurt, Zeng, H., Wang, G., Cerne, J.

مصطلحات موضوعية: Condensed Matter - Materials Science

الوصف: We report a giant enhancement of the mid-infrared (MIR) magneto-optical complex Kerr angle (polarization change of reflected light) in a variety of materials grown on SiC. In epitaxially-grown multilayer graphene, the Kerr angle is enhanced by a factor of 68, which is in good agreement with Kerr signal modeling. Strong Kerr enhancement is also observed in Fe films grown on SiC and Al-doped bulk SiC. Our experiments and modelling indicate that the enhancement occurs at the high-energy edge of the SiC reststrahlen band where the real component of the complex refractive index n passes through unity. Furthermore, since the signal is greatly enhanced when n=1, the enhancement is predicted to exist over the entire visible/infrared (IR) spectrum for a free-standing film. We also predict similar giant enhancement in both Faraday (transmission) and Kerr rotation for thin films on a metamaterial substrate with refractive index n=-1. This work demonstrates that the substrate used in MOKE measurements must be carefully chosen when investigating magneto-optical materials with weak MOKE signals or when designing MOKE-based optoelectronic devices. ; Comment: 15 pages, 4 figures

العلاقة: http://arxiv.org/abs/1901.06536Test

الإتاحة: https://doi.org/10.1103/PhysRevB.99.085440Test
http://arxiv.org/abs/1901.06536Test

المؤلفون: Mukherjee, A., Ellis, C. T., Arik, M. M., Taheri, P., Oliverio, E., Fowler, P., Tischler, J. G., Liu, Y., Glaser, E. R., Myers-Ward, R. L., Tedesco, J. L., Eddy, C. R., Gaskill, D. Kurt, Zeng, H., Wang, G., Cerne, J.

المساهمون: National Science Foundation, U.S. Department of Energy, Basic Energy Sciences, National Natural Science Foundation of China, Office of Naval Research

المصدر: Physical Review B ; volume 99, issue 8 ; ISSN 2469-9950 2469-9969

الإتاحة: https://doi.org/10.1103/physrevb.99.085440Test

المؤلفون: Mukherjee, A., Seo, J., Arik, M. M., Zhang, H., Zhang, C. C., Kirzhner, T., George, D. K., Markelz, A. G., Armitage, N. P., Koren, G., Wei, J. Y. T., Cerne, J.

المساهمون: National Science Foundation, Division of Materials Research, U.S. Department of Energy, Natural Sciences and Engineering Research Council of Canada, Canadian Institute for Advanced Research

المصدر: Physical Review B ; volume 102, issue 5 ; ISSN 2469-9950 2469-9969

الإتاحة: https://doi.org/10.1103/physrevb.102.054520Test

المؤلفون: Mukherjee, A., Seo, J., Arik, M. M., Zhang, H., Zhang, C. C., Kirzhner, T., George, D. K., Markelz, A. G., Armitage, N. P., Koren, G., Wei, J. Y. T., Cerne, J.

مصطلحات موضوعية: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

الوصف: By measuring the polarization changes in terahertz, infrared, and visible radiation over an extended energy range (3–2330 meV), we observe symmetry breaking in cuprate high-temperature superconductors over wide energy, doping, and temperature ranges. We measure the polarization rotation (Re[$θ_F$]) and ellipticity (Im[$θ_F$]) of transmitted radiation through thin films as the sample is rotated. We observe a twofold rotational symmetry in $θ_F$, which is associated with linear dichroism (LD) and occurs when electromagnetic radiation polarized along one direction is absorbed more strongly than radiation polarized in the perpendicular direction. Such polarization anisotropies can be generally associated with symmetry breakings. We measure the amplitude of the LD signal and study its temperature, energy, and doping dependence. The LD signal shows a resonant behavior with a peak in the few hundred meV range, which is coincident with the midinfrared optical feature that has been associated with the formation of the pseudogap state. In this work, the strongest LD signal is found in underdoped films, although it is also observed in optimally and overdoped samples. The LD signal is consistent with an electronic nematic order which is decoupled from the crystallographic axes as well as novel magnetoelectric effects.

وصف الملف: application/pdf

العلاقة: http://www.osti.gov/servlets/purl/1802922Test; https://www.osti.gov/biblio/1802922Test; https://doi.org/10.1103/physrevb.102.054520Test

الإتاحة: https://doi.org/10.1103/physrevb.102.054520Test
http://www.osti.gov/servlets/purl/1802922Test
https://www.osti.gov/biblio/1802922Test

المؤلفون: Mukherjee, A., Ellis, C. T., Arik, M. M., Taheri, P., Oliverio, E., Fowler, P., Tischler, J. G., Liu, Y., Glaser, E. R., Myers-Ward, R. L., Tedesco, J. L., Eddy, Jr., C. R., Gaskill, D. Kurt, Zeng, H., Wang, G., Cerne, J.

مصطلحات موضوعية: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

الوصف: We report a giant enhancement of the midinfrared magneto-optical complex Kerr angle (polarization change of reflected light) in a variety of materials grown on SiC. In epitaxially grown multilayer graphene, the Kerr angle is enhanced by a factor of 68, which is in good agreement with Kerr signal modeling. Strong Kerr enhancement is also observed in Fe films grown on SiC and Al-doped bulk SiC. Our experiments and modeling indicate that the enhancement occurs at the high-energy edge of the SiC reststrahlen band where the real component of the complex refractive index n˜ passes through unity. Furthermore, since the signal is greatly enhanced when n˜ = 1, the enhancement is predicted to exist over the entire visible and IR spectrum for a free-standing film. We also predict similar giant enhancement in both Faraday (transmission) and Kerr rotation for thin films on a metamaterial substrate with refractive index n˜ = –1. Furthermore, this paper demonstrates that the substrate used in magneto-optical Kerr effect (MOKE) measurements must be carefully chosen when investigating magneto-optical materials with weak MOKE signals or when designing MOKE-based optoelectronic devices.

وصف الملف: application/pdf

العلاقة: http://www.osti.gov/servlets/purl/1610762Test; https://www.osti.gov/biblio/1610762Test; https://doi.org/10.1103/physrevb.99.085440Test

الإتاحة: https://doi.org/10.1103/physrevb.99.085440Test
http://www.osti.gov/servlets/purl/1610762Test
https://www.osti.gov/biblio/1610762Test

المؤلفون: Mukherjee, A., Ellis, C. T., Arik, M. M., Taheri, P., Oliverio, E., Fowler, P., Tischler, J. G., Liu, Y., Glaser, E. R., Myers-Ward, R. L., Tedesco, J. L., Eddy, C. R., Gaskill, D. Kurt, Zeng, H., Wang, G., Cerne, J.

وصف الملف: application/pdf

العلاقة: http://www.osti.gov/servlets/purl/1496902Test; https://www.osti.gov/biblio/1496902Test; https://doi.org/10.1103/PhysRevB.99.085440Test

الإتاحة: https://doi.org/10.1103/PhysRevB.99.085440Test
http://www.osti.gov/servlets/purl/1496902Test
https://www.osti.gov/biblio/1496902Test