Basche is one of the founding figures of optical single-molecule spectroscopy. The group performs high-resolution fluorescence-excitation spectroscopy on single dibenzoterrylene (DBT) molecules in anthracene hosts at liquid-helium temperature, where zero-phonon lines approach the Fourier limit -- effectively a solid-state single-photon emitter with atom-like linewidths -- and studies how nanocrystal host engineering (e.g. electrohydrodynamic printing) preserves spectral stability, with polarization-resolved super-resolution imaging used to pin down crystal orientation. Further lines: photon-statistics and blinking in single quantum dots and QD/dye hybrids, and single-molecule studies of singlet fission, where photon-stream analysis of terrylenediimide dimers exposed coherent multiexciton superpositions that ensemble measurements average away. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is the molecular analogue of the colour-centre programme -- same photophysics toolkit (HBT, resonance fluorescence, orientation-resolved imaging), different emitter -- and it is the strongest single-emitter optics group in Mainz chemistry. Note: senior/long-established professor; confirm current group status and recruiting before applying.

Boeser works on neutrino astronomy and neutrino properties with the IceCube observatory at the South Pole, including optical-module instrumentation and calibration, ice-optics characterization, and oscillation/sterile-neutrino analyses; the group is also involved in next-generation radio and optical detection concepts. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), the relevance is instrumental rather than quantum-mechanical: photodetection, timing at ns level, and calibration of a km^3-scale detector. Included as an astronomy/astrophysics pivot where the sensor is the experiment.

Demsar's group studies non-equilibrium dynamics in quantum materials with ultrafast optical and terahertz probes: THz time-domain spectroscopy, optical pump-probe and time-resolved photoemission applied to superconductors, charge-density-wave systems and magnetic materials, including light-induced phase transitions and the dynamics of collective modes. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a borderline inclusion -- it is not quantum sensing per se -- but it is kept because the group's core competence is pushing temporal resolution (fs) and coherent THz detection to their limits, which is a legitimate adjacent skill set and a plausible pivot for someone with lock-in/pulsed-measurement expertise.

Dhiman holds the professorship for Physical Chemistry of Supramolecular Systems at JGU and is affiliated with the Max Planck Graduate Center. Her group uses single-molecule and super-resolution fluorescence microscopy (SMLM/PAINT-type methods) to watch synthetic supramolecular polymers assemble, exchange monomers and age in real time -- i.e. applying the biological super-resolution toolkit to non-biological self-assembling matter, and toward bioinspired/adaptive systems that behave like living materials. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a technique-driven inclusion: the emphasis is squarely on pushing spatial and temporal resolution of dye-based imaging past the ensemble limit, and it is a newer group where a postdoc would have room to shape the direction.

Duellmann heads nuclear chemistry at JGU (TRIGA reactor site) with joint appointments at GSI and the Helmholtz Institute Mainz, working on the production, chemical separation and characterization of the heaviest elements. For this search the relevant thread is 229Th: his group supplies and prepares the isomeric thorium samples and molecular thorium ions that Wendt's laser spectroscopy and Schmidt-Kaler's ion traps interrogate en route to a nuclear clock, and he is part of the broader radioactive-molecule programme aimed at symmetry-violation searches. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), the pivot is toward the next frontier of frequency metrology, where the 'sensor' is a nucleus rather than an electron shell -- an unusually good chemistry/physics interface for a postdoc.

Heinze designs earth-abundant luminescent metal complexes -- the 'molecular ruby' (Cr(III)) family and its Mo(III) NIR-II-emitting analogues -- and studies their excited-state dynamics with time-resolved luminescence, ultrafast spectroscopy and EPR, in collaboration with spin-spectroscopy groups including van Slageren at Stuttgart. Applications targeted include optical sensing (oxygen, pressure, temperature), NIR-II imaging in the tissue-transparency window, and photocatalysis. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a dye/label-based sensing inclusion rather than a spin-defect one: the emphasis is on engineering the emitter's photophysics so that lifetime and intensity report on the local environment, which is directly comparable to nanodiamond thermometry/relaxometry but at the molecular scale.

Klaeui runs one of Europe's larger nanomagnetism/spintronics groups, working on magnetic skyrmions, antiferromagnetic and ferrimagnetic spin textures, domain-wall dynamics, spin caloritronics and magnon transport, with an eye to low-power memory and unconventional (neuromorphic/stochastic) computing. The connection to this search is the metrology: reading out antiferromagnetic and skyrmionic textures requires stray-field imaging at nanometre scale, and the group uses NV scanning-probe and widefield NV magnetometry alongside synchrotron X-PEEM/XMCD and Kerr microscopy. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a strong 'sensor-as-tool' host -- the NV magnetometer is the instrument, and the physics questions are in the material. Preferred-attribute note: cutting-edge spatial resolution rather than device fabrication is the emphasis on the imaging side, though the group does substantial thin-film growth and lithography.

Lemke holds the chair of Synthetic Biophysics at JGU and is adjunct director at the Institute of Molecular Biology. The group's signature is combining genetic code expansion -- installing non-canonical amino acids so a dye can be clicked onto one chosen residue -- with single-molecule fluorescence: smFRET on intrinsically disordered proteins, super-resolution imaging of the nuclear pore complex and its FG-nucleoporin permeability barrier, and engineered membraneless organelles used as designer compartments in living cells. The result is single-molecule-resolution measurement of conformational dynamics and phase behaviour inside cells rather than in vitro. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is the strongest biosensing/advanced-microscopy host in Mainz: the labelling chemistry is precisely what a quantum-sensing postdoc would need to attach nanodiamonds or spin labels to a defined protein site, and the group already operates at the single-molecule sensitivity limit optically. Large, well-funded, internationally recruiting group.

Oberlack leads Mainz's contribution to the XENON/XENONnT dual-phase liquid-xenon dark-matter programme at Gran Sasso, covering detector instrumentation, ultra-low-background material screening, light and charge readout, and the associated rare-event analysis; the same detectors also probe neutrinoless double beta decay and coherent neutrino scattering. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is an astro-particle pivot: the shared discipline is single-quantum detection at absurd background rejection, and the group is a natural landing spot for a quantum-sensing postdoc interested in low-background readout electronics or in the growing overlap between quantum sensors and dark-matter searches.

Pohl is the central figure in muonic-atom precision spectroscopy -- the measurements that produced the proton-radius puzzle. Replacing the electron with a muon shrinks the Bohr radius ~200x and amplifies sensitivity to nuclear structure by ~10^7, so laser and microwave spectroscopy of muonic hydrogen/deuterium/helium yields charge and magnetization radii at otherwise unreachable precision. Current pushes: the CREMA/HyperMu measurement of the proton's magnetic (Zemach) structure via the muonic-hydrogen hyperfine splitting, and QUARTET, targeting ~10x better charge radii for light nuclei from Li to Ne. Work is done at PSI with cryogenic targets, ultrafast trigger lasers and X-ray detector arrays. Relative to the established NV-ensemble quantum-sensing playbook (DEER, nanoscale NMR, T1 relaxometry at pT/sqrt(Hz) ensemble sensitivity), this is a different sensing regime entirely -- the 'sensor' is the atom and the challenge is systematics at the 10^-5 level -- but it is a strong pivot for a postdoc who wants extreme metrology and detector work rather than condensed-matter spin physics.