Quantum Defects in 2D Transition Metal Dichalcogenides for Terahertz Technologies

Abstract

Substitutional transition metal (TM) point defects have recently been controllably introduced in two-dimensional (2D) transition metal dichalcogenides. We identify quantum defect candidates through a first-principles materials discovery approach with 25 TM elements substituting Mo and W in 2D MoS2 and WSe2, respectively. We elucidate trends in the charge transition levels for these 50 systems and report the existence of defects with spin-triplet ground states and a zero-field splitting (ZFS) in the terahertz (THz) regime, in contrast to typical gigahertz values. These defects can couple to resonant near-infrared radiation, providing a route to applications as high-fidelity qubits controlled by spin-dependent optical transitions. The THz ZFS implies that these high-fidelity operations can take place at higher temperatures compared to the case for GHz qubits. Our results also point toward the possibility of realising a single-photon THz emitter. This work broadens the scope of quantum defects, highlighting the opportunities for next generation THz quantum technologies - an area of growing interest given the rapid advancement in the development of THz sources and detectors.

This paper has been published on ACS Nano

References in corpus (17)

• Universal dynamical decoupling of a single solid-state spin from a spin bath
• High-fidelity projective readout of a solid-state spin quantum register
• Silicon-Vacancy Spin Qubit in Diamond: A Quantum Memory Exceeding 10 ms with Single-Shot State Readout
• Electron and Hole Mobilities in Single-Layer WSe2
• Extending Quantum Coherence in Diamond
• Tin-Vacancy Quantum Emitters in Diamond
• Sub-nanoscale Temperature, Magnetic Field and Pressure sensing with Spin Centers in 2D hexagonal Boron Nitride
• Room-temperature manipulation and decoherence of a single spin in diamond
• Design of van der Waals Interfaces for Broad-Spectrum Optoelectronics
• Purcell-enhanced single photon source based on a deterministically placed WSe${}_2$ monolayer quantum dot in a circular Bragg grating cavity
• Resonant optical spectroscopy and coherent control of Cr4+ spin ensembles in SiC and GaN
• Antisite defect qubits in monolayer transition metal dichalcogenides
• Ultra-bright single photon source based on an atomically thin material
• 2D Magnetic Semiconductors via Substitutional Doping of Transition Metal Dichalcogenides
• Absorption $\text{versus}$ Adsorption: High-Throughput Computation of Impurities in 2D Materials
• Terahertz Emission From Diamond Nitrogen-Vacancy Centers
• Single-photon source over the terahertz regime