Magneto-optics in a Sn doped CdS microcone tuned by quantum confinement effect

Area of Science:

• Materials Science
• Condensed Matter Physics
• Quantum Optics

Background:

• Magneto-optical phenomena are well-known but their study in low-dimensional materials is challenging.
• Understanding quantum confinement effects on magneto-optical properties is crucial for advanced applications.

Purpose of the Study:

• To demonstrate surface-induced quantum confinement in Sn-doped CdS microcones.
• To investigate the impact of quantum confinement on magneto-optical properties and polarization control.

Main Methods:

• Photoluminescence spectroscopy and angle-resolved photoluminescence spectroscopy were employed.
• Magneto-optical measurements characterized the polarization control.
• First-principles calculations were used to understand the underlying mechanisms.

Main Results:

• Quantum confinement was successfully demonstrated in Sn-doped CdS microcones.
• A nearly 100% tuning range enhancement in magneto-optics polarization was achieved.
• Ultrabroadband polarization control was attributed to Faraday magneto-optical rotation.

Conclusions:

• Quantum confinement effects significantly enhance magneto-optical polarization control.
• The observed enhancement is linked to isotropic exchange interaction from Sn atom hybridization.
• This work highlights the importance of quantum confinement for manipulating magneto-optical properties.