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Lasing with Topological Weyl Semimetal.

Abstract：

:Lasing behavior of optically active planar topological Weyl semimetal (TWS) is investigated in view of the Kerr and Faraday rotations. Robust topological character of TWS is revealed by the presence of Weyl nodes and relevant surface conductivities. We focus our attention on the surfaces where no Fermi arcs are formed, and thus Maxwell equations contain topological terms. We explicitly demonstrate that two distinct lasing modes arise because of the presence of effective refractive indices which lead to the birefringence phenomena. Transfer matrix is constructed in such a way that reflection and transmission amplitudes involve 2 × 2 matrix-valued components describing the bimodal character of the TWS laser. We provide associated parameters of the topological laser system yielding the optimal impacts. We reveal that gain values corresponding to the lasing threshold display a quantized behavior, which occurs due to topological character of the system. Our proposal is supported by the corresponding graphical demonstrations. Our observations and predictions suggest a concrete way of forming TWS laser and coherent perfect absorber; and are awaited to be confirmed by an experimental realization based on our computations.

journal_name

Sci Rep

journal_title

Scientific reports

authors

Oktay G,Sarısaman M,Tas M

doi

10.1038/s41598-020-59423-3

subject

Has Abstract

pub_date

2020-02-20 00:00:00

pages

3127

issue

1

issn

2045-2322

pii

10.1038/s41598-020-59423-3

journal_volume

10

pub_type

杂志文章

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