Rotation of the Transition Dipole in Single hBN Quantum Emitters via Vibronic Coupling

• URL: http://arxiv.org/abs/2604.07314v1
• Date: Wed, 08 Apr 2026 17:23:10 GMT
• Title: Rotation of the Transition Dipole in Single hBN Quantum Emitters via Vibronic Coupling
• Abstract summary: We show the vibronic breakdown of a static dipole approximation in hexagonal boron nitride quantum emitters.<n>Our results identify a fundamental limit for polarization fidelity in solid-state quantum networks.
• Score: 0.026059379504241156
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: The design of polarization-encoded quantum interfaces relies on the assumption that solid-state emitters possess static transition dipoles defined by the host lattice symmetry. Here, we demonstrate the vibronic breakdown of this static dipole approximation in hexagonal boron nitride quantum emitters. Through high-resolution energy-resolved spectroscopy, we reveal a continuous, spectral rotation of the emission dipole orientation reaching up to 40$^{\circ}$, driven by coupling to the phonon bath. This spectral gradient is significantly suppressed at cryogenic temperatures (6 K), identifying thermally activated lattice vibrations as the primary driver of the dipole reorientation. First-principles calculations on two representative defect types indicate the microscopic origin of this phenomenon as a coordinate-dependent transition dipole, where phonon-induced atomic displacements fundamentally perturb the electronic wavefunctions. By comparing the distinct defect environments, we demonstrate that the magnitude of the polarization rotation scales with the strength of the vibronic coupling. Our results not only identify a fundamental limit for polarization fidelity in solid-state quantum networks but also suggest a new class of strain-tunable quantum photonic devices based on vibronic dipole reorientation.

Related papers

• Observation of node-dependent Rydberg molecular bound states [43.78588154579659]
  We report the experimental observation of node-dependent p-wave molecular signals in Rb(nS)-Rb(5S) Rydberg molecular spectra.<n>Our findings reveal a more profound quantum control mechanism, wherein the principal quantum number acts as a switch for nodal-selective molecular bound states.
  arXiv  Detail & Related papers  (2026-07-09T12:54:46Z)
• A unified framework for determining transition dipole polarization in solid-state spin defects [5.476851709406945]
  We develop a framework for reconstructing electric transition dipole polarization in spin-1/2 solid-state defects directly from ensemble spectroscopy.<n>Results establish a broadly applicable route for extracting microscopic properties of solid-state quantum emitters from ensemble spectroscopy and for engineering optimized spin-photon and spin-phonon interfaces.
  arXiv  Detail & Related papers  (2026-06-27T07:27:48Z)
• Tailoring pure valley-Zeeman spin-orbit coupling in WSe$_2$-encapsulated monolayer graphene [42.39722022913058]
  Engineering proximity effects in twisted van der Waals heterostructures offers a powerful platform for designing electronic properties.<n>We report pure valley-Zeeman spin-orbit coupling in monolayer graphene, achieved by encapsulation between two parallel twisted WSe$$ monolayers.<n>We also demonstrate the ability to completely quench the proximity spin-orbit coupling by tuning the encapsulated geometry.
  arXiv  Detail & Related papers  (2026-06-02T07:43:48Z)
• Investigating Spectral Dynamics and Spin Signatures of a Mechanically Isolated Quantum Emitter in hBN [70.39382957795658]
  Mechanically isolated defect centers in hexagonal boron nitride are promising coherent quantum emitters.<n>We investigate a single mechanically isolated quantum emitter in hBN integrated onto a coplanar waveguide.
  arXiv  Detail & Related papers  (2026-04-16T13:24:11Z)
• Microscopic quantum description of surface plasmon polaritons: revealing intrinsic ultrastrong light-matter coupling [0.39146761527401425]
  We develop a microscopic quantum theory of surface plasmon polaritons valid for arbitrary metal-dielectric geometries.<n>As specific applications, we recover the localized surface plasmon modes of metallic nanoparticles, including radiative frequency shifts and decay.<n>Our quantum treatment further reveals that light-matter interactions at metal-dielectric interfaces are inherently in the ultrastrong coupling regime.
  arXiv  Detail & Related papers  (2026-01-16T13:52:12Z)
• Polarization-dependent topology in quantum emitter chains [0.0]
  We show that, if the chain is zigzag-shaped, different topological phases can be realized by adjusting the polarization direction.<n>Our findings open up a way to actively switch between various topological phases within a single arrangement of quantum emitters.
  arXiv  Detail & Related papers  (2025-03-18T22:45:17Z)
• Quantum optical scattering by macroscopic lossy objects: A general approach [55.2480439325792]
  We develop a general approach to describe the scattering of quantum light by a lossy macroscopic object placed in vacuum.<n>We exploit the input-output relation to connect the output state of the field to the input one.<n>We analyze the impact of the classical transmission and absorption dyadics on the transitions from ingoing to outgoing s-polariton.
  arXiv  Detail & Related papers  (2024-11-27T17:44:29Z)
• Enhanced control of single-molecule emission frequency and spectral diffusion [0.0]
  Stark effect provides a powerful method to shift the spectra of molecules, atoms and electronic transitions in general. We provide experimental evidence of this trend, using molecular quantum emitters in the solid state cooled down to liquid helium. Based on the anisotropy of the molecule's polarizability, our two-dimensional control of the local electric field allows not only to tune the emitter's frequency but also to sensibly suppress the spectral instabilities associated to field fluctuations.
  arXiv  Detail & Related papers  (2024-09-03T12:40:40Z)
• Unveiling the Quantum Toroidal Dipole [41.99844472131922]
  We present a complete quantum-mechanical formalism for the TD in a nanostructure.<n>We propose the first spectroscopic method for its direct measurement.<n>This provides a clear experimental blueprint to unveil, measure, and characterize this elusive third multipole moment.
  arXiv  Detail & Related papers  (2024-01-26T13:31:32Z)
• Directional spontaneous emission in photonic crystal slabs [49.1574468325115]
  Spontaneous emission is a fundamental out-of-equilibrium process in which an excited quantum emitter relaxes to the ground state due to quantum fluctuations. One way to modify these photon-mediated interactions is to alter the dipole radiation patterns of the emitter, e.g., by placing photonic crystals near them. Our study delves into the interaction between these directional emission patterns and the aforementioned variables, revealing the untapped potential to fine-tune collective quantum optical phenomena.
  arXiv  Detail & Related papers  (2023-12-04T15:35:41Z)
• Engineering the impact of phonon dephasing on the coherence of a WSe$_{2}$ single-photon source via cavity quantum electrodynamics [36.88715167286119]
  Emitter dephasing is one of the key issues in the performance of solid-state single photon sources. We show that it is possible to tune and engineer the coherence of photons emitted from a single WSe$$ monolayer dot via selectively coupling it to a spectral cavity resonance.
  arXiv  Detail & Related papers  (2023-07-13T16:41:06Z)
• Simultaneous Quantum Squeezing of Light Polarizations and Atomic Spins in a Cold Atomic Gas [0.0]
  We present a scheme to realize simultaneous quantum squeezing of light polarizations and atomic spins via a double electromagnetically induced transparency (DEIT) We derive two coupled quantum nonlinear Schr"odinger equations from Maxwell-Heisenberg-Langevin equations describing the quantum dynamics of the atoms and the probe pulse. The results of the simultaneous squeezing of light polarizations and atomic spins by using only a coherent probe pulse reported here opens a route for uncovering the unique property of the quantum interface between light and atomic ensembles.
  arXiv  Detail & Related papers  (2023-03-15T12:02:27Z)
• Polarization dynamics of solid-state quantum emitters [32.54627168659622]
  Quantum emitters in solid-state crystals have attracted a lot of attention due to their simple applicability in optical quantum technologies. polarization of single photons generated by quantum emitters is one of the key parameters that play a crucial role in the applications.
  arXiv  Detail & Related papers  (2023-03-08T17:18:15Z)
• Non-Markovian perturbation theories for phonon effects in strong-coupling cavity quantum electrodynamics [0.0]
  phonon interactions are inevitable in cavity quantum electrodynamical systems based on solid-state emitters or fluorescent molecules. It remains a significant theoretical challenge to describe such effects in a computationally efficient manner. We consider four non-Markovian perturbative master equation approaches to describe such dynamics.
  arXiv  Detail & Related papers  (2021-03-26T08:32:19Z)
• Chemical tuning of spin clock transitions in molecular monomers based on nuclear spin-free Ni(II) [52.259804540075514]
  We report the existence of a sizeable quantum tunnelling splitting between the two lowest electronic spin levels of mononuclear Ni complexes. The level anti-crossing, or magnetic clock transition, associated with this gap has been directly monitored by heat capacity experiments. The comparison of these results with those obtained for a Co derivative, for which tunnelling is forbidden by symmetry, shows that the clock transition leads to an effective suppression of intermolecular spin-spin interactions.
  arXiv  Detail & Related papers  (2021-03-04T13:31:40Z)

This list is automatically generated from the titles and abstracts of the papers in this site.

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.