Theory for optical activity in monolayer black phosphorus under external magnetic field
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THE EUROPEAN PHYSICAL JOURNAL B
Regular Article
Theory for optical activity in monolayer black phosphorus under external magnetic field Chenchen Liu 1 , Feng Wu 2 , Qingyun Jiang 1 , Yihang Chen 1 , and Chengping Yin 1,a 1
2
Guangdong Provincial Key Laboratory of Quantum Engineering and Quantum Materials, and School of Physics and Telecommunication Engineering, South China Normal University, Guangzhou 510006, P.R. China School of Optoelectronic Engineering, Guangdong Polytechnic Normal University, Guangzhou 510665, P.R. China
Received 1 August 2020 / Received in final form 30 August 2020 / Accepted 9 September 2020 Published online 14 October 2020 c EDP Sciences / Societ`
a Italiana di Fisica / Springer-Verlag GmbH Germany, part of Springer Nature, 2020 Abstract. We derive an analytical model for calculating the optical activity in monolayer black phosphorus under an external magnetic field. By optimizing the parameters, the circular dichroism can be comparable to that in previously reported chiral metamaterials in a broad angle range. Besides, the optical activity including the circular dichroism, the circular conversion dichroism and the circular birefringence can be tuned almost linearly via changing the applied magnetic field magnitude. These results show that our proposed model would possess potential applications in polarization optics, stereochemistry, and molecular biology.
1 Introduction Optical activity, including circular dichroism and circular birefringence effects, represents the ability in manipulating the polarized state of light [1–5]. Circular dichroism characterizes transmittance (or reflectance/absorptance) difference between left circularly polarized (LCP) and right circularly polarized (RCP) waves [1,2] while circular birefringence characterizes the ability in rotating the polarization plane of light wave [3–5]. Optical activity has always been a hot research topic since it is strongly related to various areas, including polarization optics [6,7], stereochemistry [8], and molecular biology [9,10]. A natural idea to realize optical activity is by using structures with intrinsic chirality, such as helix arrays [11–14] and chiral metamaterials [15–20]. In the past several decades, uniaxial anisotropic materials have attracted researchers’ great interest due to its versatile applications in polarization control [21,22], optical filtering [23–25], biosensing [26], and near-field radiative heat transfer [27,28]. For a long time, uniaxial anisotropic materials had not been considered to achieve optical activity since they do not possess intrinsic chirality. Nevertheless, in 2008 and 2009, Plum et al. found that under oblique incidence, nonchiral uniaxial anisotropic structures can show strong optical activity, which is referred to as extrinsic chirality [29,30]. Very recently, researches numerically demonstrated that strong a
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optical activity can be realized in a monolayer black phosphorus (BP) [31]. As a kind of two-dimensional materials, monolayer BP has a p
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