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Gigantic Tellegen responses in metamaterials.
Nat Commun
January 2025
New Cornerstone Science Laboratory, Department of Physics, University of Hong Kong, 999077, Hong Kong, China.
Tellegen medium has long been a topic of debate, with its existence being contested over several decades. It was first proposed by Tellegen in 1948 and is characterized by a real-valued cross coupling between electric and magnetic responses, distinguishing it from the well-known chiral medium that has imaginary coupling coefficients. Significantly, Tellegen responses are closely linked to axion dynamics, an extensively studied subject in condensed matter physics.
View Article and Find Full Text PDFMagnetic-proximity-induced anomalous hall effect at the EuO/SbTeinterface.
J Phys Condens Matter
December 2024
Department of Physics, Indian Institute of Technology Delhi, DEPRTMENT OF PHYSICS, IIT DELHI, HAUZ KHAS, New Delhi, Delhi, 110016, INDIA.
Time-reversal symmetry breaking of a topological insulator phase generates zero-field edge modes which are the hallmark of the quantum anomalous Hall effect (QAHE) and of possible value for dissipation-free switching or non-reciprocal microwave devices. But present material systems exhibiting the QAHE, such as magnetically doped bismuth telluride and twisted bilayer graphene, are intrinsically unstable, limiting their scalability. A pristine magnetic oxide at the surface of a TI would leave the TI structure intact and stabilize the TI surface, but epitaxy of an oxide on the lower-melting-point chalcogenide presents a particular challenge.
View Article and Find Full Text PDFThe increasing demand for controlling electromagnetic waves has led to the construction of a variety of metasurface absorbers with different functionalities. In this Letter, we designed a kind of single-layer metasurfaces with delicately designed hybrid magnetic meta-atoms (HMMAs), which can be operated as perfect absorbers (PAs) for the electromagnetic wave incident at a specified direction, but at the mirror symmetric direction, the nearly total reflection is achieved. This remarkable nonreciprocal phenomenon arises from the time-reversal symmetry (TRS) breaking nature of magnetic surface plasmon as well as the lattice Kerker effect due to the interaction of HMMAs in the single-layer metasurfaces.
View Article and Find Full Text PDFNonreciprocal superconductivity.
Sci Adv
November 2024
Department of Physics, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
Article Synopsis
- The concept of nonreciprocal superconductors involves breaking inversion and time-reversal symmetries, leading to an uneven energy dispersion in these materials.
- Andreev reflection is used to detect nonreciprocal superconductivity, with a transparent junction between a normal metal and a nonreciprocal superconductor showing an asymmetric current-voltage relationship.
- Potential candidates for nonreciprocal superconductors include materials like graphene and UTe, as well as specially designed platforms for research.
Layered Babinet complementary patterns acting as asymmetric negative index metamaterial.
Sci Rep
November 2024
Department of Optics and Quantum Electronics, University of Szeged, Dóm tér 9, Szeged, 6720, Hungary.
Azimuthal orientation and handedness dependence of the optical responses, accompanied by asymmetric transmission and asymmetric dichroism, were demonstrated on multilayers constructed with subwavelength periodic arrays of Babinet complementary miniarrays, illuminated by linearly and circularly polarized light. In case of single-sided illumination asymmetric optical responses were observed at the spectral location of maximal cross-polarization that is accompanied by radiative electric dipoles and weak, slowly-rotating in-plane magnetic dipoles on the nano-objects; where the outgoing waves are elliptically (almost circularly) polarized. The negative index material phenomenon was demonstrated, where the electric and magnetic dipoles overlap both spatially and spectrally.
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