Proceedings of MATSUS Fall 2023 Conference (MATSUSFall23)
DOI: https://doi.org/10.29363/nanoge.matsus.2023.316
Publication date: 18th July 2023
Quantum sensors can harness the sensitivity of the entangled electron spin states to external stimuli to probe physical properties such as temperature, electric and magnetic fields. However, improvements are still required for efficient and reliable read-out of the stored quantum information to expand the applicability of devices. Molecular systems are the most recent candidates for quantum device applications as these systems can be tuned to have specific magnetic properties and much work is being done to achieve optical readout, analogous to NV centers in diamond. Here, we investigate the possibility of a digital state readout by combining a molecular spin system to a valleytronic material.
Coordination compounds use structural tuning to provide precise tailoring of magnetic properties, with phthalocyanines established as a versatile system. Specifically, vanadyl phthalocyanine (VOPc) is considered, a spin ½ system with long (μs) coherence times that can be easily and predictably deposited on a range of substrates. Films consisting of a few layers of transition metal dichalcogenides (TMDC) have demonstrated circular polarized photoluminescence from the transition to a direct band gap semiconductor. Chiral emission is relevant to spin-selective optoelectronics and combining the molecular spin qubit with a TMDC substrate could lead to interesting opportunities in quantum sensing. However, at this stage little is known of the electronic and spin interactions at such an interface and the extent of spin-valley cooperativity. We therefore present an optical study of the VOPc thermally evaporated on WSe2. Transient absorption (TA) spectroscopy and time resolved circular dichroism (TRCD) are performed to extract spin-valley relaxation parameters and correlate these to the molecular orientation on the 2D layer. This provides critical information to design new architectures for quantum sensors.
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