Suppressed Magnetic Circular Dichroism and Valley-Selective Magnetoabsorption due to the Effective Mass Anisotropy in Bismuth

Article Article scientifique Article Suppressed Magnetic Circular Dichroism and Valley-Selective Magnetoabsorption due to the Effective Mass Anisotropy in Bismuth eng 2016 author De Visser Pieter Jan 830852 author Levallois Julien 686018 author Tran Michaël 777355 author Poumirol Jean-Marie 814989 author Nedoliuk Ievgeniia 722543 author Teyssier Jérémie 0000-0002-7590-2987 604738 author Uher Ctirad author Van Der Marel Dirk 0000-0001-5266-9847 135104 author Kuzmenko Alexey 0000-0001-9574-6435 135384 017402 10.1103/PhysRevLett.117.017402 0031-9007 https://link.aps.org/doi/10.1103/PhysRevLett.117.017402 We measure the far-infrared reflectivity and Kerr angle spectra on a high-quality crystal of pure semimetallic bismuth as a function of magnetic field, from which we extract the conductivity for left- and right-handed circular polarizations. The high spectral resolution allows us to separate the intraband Landau level transitions for electrons and holes. The hole transition exhibits 100% magnetic circular dichroism; it appears only for one polarization as expected for a circular cyclotron orbit. However, the dichroism for electron transitions is reduced to only 13%, which is quantitatively explained by the large effective mass anisotropy of the electron pockets of the Fermi surface. This observation is a signature of the mismatch between the metric experienced by the photons and the electrons. It allows for a contactless measurement of the effective mass anisotropy and provides a direction towards valley polarized magnetooptical pumping with elliptically polarized light. Far-infrared Kerr angle Semimetal Bismuth Landau level Dichroism Dewey 500.2 33 Département de physique de la matière quantique 131 false 1364 Groupe Kuzmenko 785 Groupe Van der Marel Physical Review Letters 117 1 b4238191-bd17-4f2b-8602-6cb29ee3e82b Article (Published version) Public PhysRevLett.117.017402.pdf 582782 application/pdf openAccess Faculté des sciences / Section de physique / Département de physique de la matière quantique

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Suppressed Magnetic Circular Dichroism and Valley-Selective Magnetoabsorption due to the Effective Mass Anisotropy in Bismuth	Physical Review Letters			2016	521	378

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De Visser, Pieter Jan