Electron circular dichroism in hot electron emission from metallic nanohelix arrays

Author:

Nürenberg Daniel12ORCID,Mark Andrew G.3,Fischer Peer345ORCID,Zacharias Helmut12ORCID

Affiliation:

1. Center for Soft Nanoscience, University of Münster 1 , 48149 Münster, Germany

2. Physikalisches Institut, University of Münster 2 , 48149 Münster, Germany

3. Max Planck Institute for Intelligent Systems 3 , Heisenbergstr. 3, 70569 Stuttgart, Germany

4. Max Planck Institute for Medical Research 4 , Jahnstr. 29, 69120 Heidelberg, Germany

5. Institute for Molecular Systems Engineering and Advanced Materials, Heidelberg University 5 , Im Neuenheimer Feld 225, 69120 Heidelberg, Germany

Abstract

We investigate the electron emission from 3D chiral silver alloy nanohelices initiated by femtosecond laser pulses with a central photon energy of hν = 1.65 eV, well below the work function of the material. We find hot but thermally distributed electron spectra and a strong anisotropy in the electron yield with left- and right-circularly polarized light excitations, which invert in sign between left- and right-handed helices. We analyze the kinetic energy distribution and discuss the role of effective temperatures. Measurements of the reflectance and simulations of the absorbance of the helices based on retarded field calculations are compared to the anisotropy in photoemission. We find a significant enhancement of the anisotropy in the electron emission in comparison to the optical absorption. Neither simple thermionic nor a multiphoton photoemission can explain the experimentally observed asymmetries. Single photon deep-UV photoemission from these helices together with a change of the work function suggests a contribution of the chirally induced spin selectivity effect to the observed asymmetries.

Funder

Deutsche Forschungsgemeinschaft

Publisher

AIP Publishing

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy

Reference53 articles.

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