Research paperExperimental CharacterizationComputational DFTTransition Dipole Rotation Beyond the Condon Approximation in Single hBN Quantum EmittersSerkan Paçal, Chanaprom Cholsuk, Mouli Hazra, Çağlar Samaner et al.arXiv preprint·2026·arXiv:2604.07314AbstractWe demonstrate that the transition dipole moment of single hexagonal boron nitride quantum emitters rotates as a function of photon energy. Energy-resolved spectroscopy shows a continuous rotation of the emission dipole orientation up to 40° across the vibronic manifold at room temperature, while cryogenic measurements at 6 K suppress this effect. First-principles calculations on two representative defects in weak- and strong-coupling regimes show that phonon-displaced geometries induce systematic transition-dipole reorientation, supporting a non-Condon interpretation of the emission.Read more
Single hBN quantum emitter measured at room temperature with energy-resolved polarization analysis of the ZPL and optical phonon sideband.2 characterizations9 properties2 figuresExperimentalhBNStudied MaterialExpand
Second representative single hBN quantum emitter used for cryogenic (6 K) and room-temperature polarization-resolved Stokes measurements.2 characterizations3 properties1 figureExperimentalhBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the weak electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the strong electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Research paperExperimental CharacterizationComputational DFTTransition Dipole Rotation Beyond the Condon Approximation in Single hBN Quantum EmittersSerkan Paçal, Chanaprom Cholsuk, Mouli Hazra, Çağlar Samaner et al.arXiv preprint·2026·arXiv:2604.07314AbstractWe demonstrate that the transition dipole moment of single hexagonal boron nitride quantum emitters rotates as a function of photon energy. Energy-resolved spectroscopy shows a continuous rotation of the emission dipole orientation up to 40° across the vibronic manifold at room temperature, while cryogenic measurements at 6 K suppress this effect. First-principles calculations on two representative defects in weak- and strong-coupling regimes show that phonon-displaced geometries induce systematic transition-dipole reorientation, supporting a non-Condon interpretation of the emission.Read more
Single hBN quantum emitter measured at room temperature with energy-resolved polarization analysis of the ZPL and optical phonon sideband.2 characterizations9 properties2 figuresExperimentalhBNStudied MaterialExpand
Second representative single hBN quantum emitter used for cryogenic (6 K) and room-temperature polarization-resolved Stokes measurements.2 characterizations3 properties1 figureExperimentalhBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the weak electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the strong electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Research paperExperimental CharacterizationComputational DFTTransition Dipole Rotation Beyond the Condon Approximation in Single hBN Quantum EmittersSerkan Paçal, Chanaprom Cholsuk, Mouli Hazra, Çağlar Samaner et al.arXiv preprint·2026·arXiv:2604.07314AbstractWe demonstrate that the transition dipole moment of single hexagonal boron nitride quantum emitters rotates as a function of photon energy. Energy-resolved spectroscopy shows a continuous rotation of the emission dipole orientation up to 40° across the vibronic manifold at room temperature, while cryogenic measurements at 6 K suppress this effect. First-principles calculations on two representative defects in weak- and strong-coupling regimes show that phonon-displaced geometries induce systematic transition-dipole reorientation, supporting a non-Condon interpretation of the emission.Read more
Single hBN quantum emitter measured at room temperature with energy-resolved polarization analysis of the ZPL and optical phonon sideband.2 characterizations9 properties2 figuresExperimentalhBNStudied MaterialExpand
Second representative single hBN quantum emitter used for cryogenic (6 K) and room-temperature polarization-resolved Stokes measurements.2 characterizations3 properties1 figureExperimentalhBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the weak electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the strong electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Research paperExperimental CharacterizationComputational DFTTransition Dipole Rotation Beyond the Condon Approximation in Single hBN Quantum EmittersSerkan Paçal, Chanaprom Cholsuk, Mouli Hazra, Çağlar Samaner et al.arXiv preprint·2026·arXiv:2604.07314AbstractWe demonstrate that the transition dipole moment of single hexagonal boron nitride quantum emitters rotates as a function of photon energy. Energy-resolved spectroscopy shows a continuous rotation of the emission dipole orientation up to 40° across the vibronic manifold at room temperature, while cryogenic measurements at 6 K suppress this effect. First-principles calculations on two representative defects in weak- and strong-coupling regimes show that phonon-displaced geometries induce systematic transition-dipole reorientation, supporting a non-Condon interpretation of the emission.Read more
Single hBN quantum emitter measured at room temperature with energy-resolved polarization analysis of the ZPL and optical phonon sideband.2 characterizations9 properties2 figuresExperimentalhBNStudied MaterialExpand
Second representative single hBN quantum emitter used for cryogenic (6 K) and room-temperature polarization-resolved Stokes measurements.2 characterizations3 properties1 figureExperimentalhBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the weak electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand
Representative hBN defect used in first-principles calculations for the strong electron-phonon coupling regime.No measurements recordedSimulated Supercell DfthBNStudied MaterialExpand