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Topological frequency conversion in Weyl semimetals

Nathan, Frederik and Martin, Ivar and Refael, Gil (2022) Topological frequency conversion in Weyl semimetals. . (Unpublished)

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We show that a Weyl semimetal irradiated at two distinct frequencies can convert energy between the frequencies at a potentially large rate. The phenomenon is a realization of topological frequency conversion from [Martin et al, PRX 7 041008 (2017)]. When the effect is realized, each electron near a Weyl point acts as a topological frequency converter, and converts energy at a universal rate given by Planck's constant multiplied by the product of the two frequencies. Our results indicate that Weyl points in TaAs support topological frequency conversion in the THz regime at achievable intensities of order 100 W/mm2. When the topological energy conversion rate exceeds the dissipation rate, the effect can be used for optical amplification. This amplification regime can be achieved when the relaxation rate of the system is larger than the characteristic driving period. This phenomenon further amplifies Weyl semimetals' promise for optical amplification and terahertz (THz) generation.

Item Type:Report or Paper (Discussion Paper)
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URLURL TypeDescription Paper ItemArticle
Nathan, Frederik0000-0001-9700-0231
Martin, Ivar0000-0002-2010-6449
Additional Information:We thank Mark Rudner, Prineha Narang, Chris Ciccarino, and N. Peter Armitage for valuable discussions. FN gratefully acknowledges the support of the European Research Council (ERC) under the European Union Horizon 2020 Research and Innovation Programme (Grant Agreement No. 678862) and the Villum Foundation. IM was supported by the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. Department of Energy. GR is grateful for support from the Simons Foundation as well as support from the NSF DMR grant number 1839271. This work is supported by ARO MURI Grant No. W911NF-16-1-0361, and was performed in part at Aspen Center for Physics, which is supported by National Science Foundation grant PHY-1607611.
Group:Institute for Quantum Information and Matter
Funding AgencyGrant Number
European Research Council (ERC)678862
Villum FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Simons FoundationUNSPECIFIED
Army Research Office (ARO)W911NF-16-1-0361
Record Number:CaltechAUTHORS:20220224-200907852
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:113596
Deposited By: George Porter
Deposited On:28 Feb 2022 17:54
Last Modified:01 Dec 2022 18:03

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