A Caltech Library Service

Topological frequency conversion in Weyl semimetals

Nathan, Frederik and Martin, Ivar and Refael, Gil (2022) Topological frequency conversion in Weyl semimetals. Physical Review Research, 4 (4). Art. No. 043060. ISSN 2643-1564. doi:10.1103/physrevresearch.4.043060.

Full text is not posted in this repository. Consult Related URLs below.

Use this Persistent URL to link to this item:


We theoretically predict a working principle for optical amplification, based on Weyl semimetals: When a Weyl semimetal is suitably irradiated at two frequencies, electrons close to the Weyl points convert energy between the frequencies through the mechanism of topological frequency conversion from [Martin et al., Phys. Rev. X 7, 041008 (2017)]. Each electron converts energy at a quantized rate given by an integer multiple of Planck's constant multiplied by the product of the two frequencies. In simulations, we show that optimal, but feasible band structures, can support topological frequency conversion in the “THz gap” at intensities down to 2 W/mm²; the gain from the effect can exceed the dissipative loss when the frequencies are larger than the relaxation time of the system. Topological frequency conversion forms a paradigm for optical amplification, which further extends Weyl semimetals' promise for technological applications.

Item Type:Article
Related URLs:
URLURL TypeDescription ItemDiscussion Paper
Nathan, Frederik0000-0001-9700-0231
Martin, Ivar0000-0002-2010-6449
Additional Information:We thank N. Peter Armitage, Chris Ciccarino, Cyprian Lewandowski, Prineha Narang, and Mark Rudner for valuable discussions. F.N. 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. I.M. was supported by the Materials Sciences and Engineering Division, Basic Energy Sciences, Office of Science, U.S. Department of Energy. G.R. is grateful for support from the Simons Foundation as well as support from the NSF DMR Grant No. 1839271, and this work is supported by ARO MURI Grant No. W911NF-16-1-0361. This work 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
Issue or Number:4
Record Number:CaltechAUTHORS:20221121-712406200.5
Persistent URL:
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:117940
Deposited By: Research Services Depository
Deposited On:01 Dec 2022 18:03
Last Modified:01 Dec 2022 18:03

Repository Staff Only: item control page