Narrowband, angle-tunable, helicity-dependent terahertz emission from nanowires of the topological dirac semimetal Cd3As2

DOI: 10.1021/acsphotonics.3c00068

Authors: Jessica L. Boland (University of Manchester) , Djamshid A. Damry (University of Manchester) , Chelsea Q. Xia (University of Oxford) , Piet Schoenherr (University of Oxford) , Dharmalingam Prabhakaran (University of Oxford) , Laura M. Herz (University of Oxford) , Thorsten Hesjedal (University of Oxford) , Michael B. Johnston (University of Oxford)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Acs Photonics , VOL 59

State: Published (Approved)
Published: April 2023

Abstract: All-optical control of terahertz pulses is essential for the development of optoelectronic devices for next-generation quantum technologies. Despite substantial research in THz generation methods, polarization control remains difficult. Here, we demonstrate that by exploiting band structure topology, both helicity-dependent and helicity-independent THz emission can be generated from nanowires of the topological Dirac semimetal Cd3As2. We show that narrowband THz pulses can be generated at oblique incidence by driving the system with optical (1.55 eV) pulses with circular polarization. Varying the incident angle also provides control of the peak emission frequency, with peak frequencies spanning 0.21–1.40 THz as the angle is tuned from 15 to 45°. We therefore present Cd3As2 nanowires as a promising novel material platform for controllable terahertz emission.

Journal Keywords: terahertz; photonics; nanowires; Dirac semi-metal; helicity-dependent emission

Subject Areas: Materials, Physics

Diamond Offline Facilities: Surfaces and Interfaces Laboratory
Instruments:

Added On: 04/04/2023 14:19

Documents:
acsphotonics.3c00068.pdf

Discipline Tags:

Surfaces Quantum Materials Physics Electronics Materials Science Nanoscience/Nanotechnology

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