Zeller, Viola and Mundigl, Nadine and Junior, Paulo E. Faria and Fabian, Jaroslav and Schueller, Christian and Bougeard, Dominique (2022) Wurtzite Quantum Wires with Strong Spatial Confinement: Polarization Anisotropies in Single-Wire Spectroscopy. PHYSICAL REVIEW APPLIED, 18 (5): 054014. ISSN 2331-7019
Full text not available from this repository. (Request a copy)Abstract
We report GaAs/(Al, Ga)As nanowires in the one-dimensional (1D) quantum limit. The ultrathin wurtzite GaAs cores between 20 and 40 nm induce large confinement energies of several tens of millielectronvolts, allowing us to experimentally resolve up to four well-separated subband excitations in microphotoluminescence spectroscopy. Our detailed experimental and theoretical polarization-resolved study reveals a strong diameter-dependent anisotropy of these transitions: We demonstrate that the polarization of the detected photoluminescence is governed, on the one hand, by the symmetry of the wurtzite 1D quantum wire subbands but also, on the other, by the dielectric mismatch of the wires with the surrounding material. The latter effect leads to a strong attenuation of perpendicularly polarized light in thin-dielectric wires, making the thickness of the (Al, Ga)As shell an important factor in the observed polarization behavior. Including the dielectric mismatch to our k center dot p-based simulated polarization-resolved spectra of purely wurtzite GaAs quantum wires, we find excellent agreement between experiment and theory. These findings reveal insights relevant to spectroscopic studies of the 1D quantum regime and the design of photonic quantum wire applications such as lasers and hopefully open up paths for selective subband excitations.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | OPTICAL-PROPERTIES; REFRACTIVE-INDEX; NANOWIRE; PHOTOLUMINESCENCE |
| Subjects: | 500 Science > 530 Physics |
| Divisions: | Physics > Institute of Theroretical Physics > Chair Professor Richter > Group Jaroslav Fabian Physics > Institute of Experimental and Applied Physics > Chair Professor Huber > Group Dominique Bougeard Physics > Institute of Experimental and Applied Physics > Chair Professor Lupton > Group Christian Schüller |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 07 Feb 2024 07:35 |
| Last Modified: | 07 Feb 2024 07:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/56616 |
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