Electron-Phonon Coupling of Mechanically Isolated Defect Centers in Hexagonal Boron Nitride

Single Photon emitters are a crucial resource for novel quantum optic technologies. Hosted quantum emitters in hexagonal Boron Nitride (hBN) are promising candidates for the integration into hybrid quantum systems, which can be used in upcoming quantum optic technologies. One type of such emitter has shown the remarkable property of Fourier transform limited optical linewidth at cryogenic temperatures and even up to room temperature. [1,2]. This characteristic can be traced back to out-of-plane emitters, which do not couple to in-plane phonon modes. That leads to mechanical isolation of the defect centers orbitals [3]. Here, we present our most recent results towards understanding the origin of this mechanical decoupling.