Signatures of Spin Coherence in Chiral Coupled Quantum Dots

• URL: http://arxiv.org/abs/2601.04981v1
• Date: Thu, 08 Jan 2026 14:33:46 GMT
• Title: Signatures of Spin Coherence in Chiral Coupled Quantum Dots
• Authors: Hanna T. Fridman, Rotem Malkinson, Amir Hen, Shira Yochelis, Yossi Paltiel, Nir Bar-gill,
• Abstract summary: Chiral-induced spin selectivity (CISS) enables spin selectivity of charge carriers in chiral molecular systems without magnetic materials.<n>We in- vestigate spin-dependent photoluminescence dynamics in multilayer quantum-dot assemblies coupled by chiral linkers.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Chiral-induced spin selectivity (CISS) enables spin selectivity of charge carriers in chiral molecular systems without magnetic materials. While spin selectivity has been widely investigated, its quantum coherence has not yet been explored. Here, we in- vestigate spin-dependent photoluminescence (PL) dynamics in multilayer quantum-dot (QD) assemblies coupled by chiral linkers. Using circularly polarized excitation in the presence of an external magnetic field, we observe a pronounced modulation of the PL lifetime that depends on the magnetic field magnitude and geometry. The lifetime difference between left- and right-circularly polarized excitations exhibits a field-angle dependence, consistent with spin precession driven by the transverse magnetic-field component relative to the chiral axis. A model incorporating coupled spin precession and decay processes reproduces the experimental trends. These results establish chiral QD assemblies as a room-temperature platform for probing quantum coherent manifestations of the CISS effect, with implications for spintronic and quantum technologies.

Related papers

• Magnetically assisted spin-resolved electron diffraction: Coherent control of spin population and spatial filtering [0.0]
  A self-consistent Maxwell-Pauli framework is developed to study spin-resolved electron diffraction from nanogratings in the presence of magnetic fields.<n> Numerical simulations show that the intrinsic magnetic self-field produced by the electron probability current is several orders of magnitude too weak to induce measurable spin mixing.<n>The proposed approach enables spatial tunable separation of spin-resolved free electron beams and establishes an all-magnetic route for coherent spin rotation, control, and interferometry.
  arXiv  Detail & Related papers  (2026-02-17T14:43:01Z)
• Mixed Quantum-Classical Approaches to Spin Current and Polarization Dynamics in Chiral Molecular Junctions [5.020793511932902]
  Chiral molecular junctions offer a promising platform for realizing chiral-induced spin selectivity (CISS)<n>We investigate spin transport in such junctions by combining quantum master equation (QME) methods for purely electronic dynamics with surface hopping (SH) and mean-field Ehrenfest (MF) approaches to incorporate electron-phonon coupling.
  arXiv  Detail & Related papers  (2025-09-10T07:48:33Z)
• Quantum-impurity sensing of altermagnetic order [0.0]
  We show that quantum relaxometry with nitrogen-vacancy centers in diamond can reveal the anisotropic spin dynamics of altermagnetic insulators.<n>We show that the distance and orientation dependent relaxation rate of a nearby quantum impurity encodes signatures of momentum space anisotropy in the spin diffusion response.
  arXiv  Detail & Related papers  (2025-08-06T18:04:01Z)
• Observation of Magnetic Devil's Staircase-Like Behavior in Quasiperiodic Qubit Lattices [55.2480439325792]
  devil's staircase (DS) phenomenon is a fractal response of magnetization to external fields.<n>We uncover a wealth of abrupt magnetic transitions driven by increasing external magnetic fields within a simple yet effective Ising-model framework.<n>Our results challenge the prevailing view that DS behavior is limited to periodic systems.
  arXiv  Detail & Related papers  (2025-07-24T21:39:06Z)
• Dynamical Reorientation of Spin Multipoles in Silicon Carbide by Transverse Magnetic Fields [0.0]
  Application of weak magnetic fields to the symmetry axis leads to nontrivial behavior caused by dynamical reorientation of the $mathrmV_Si$ spin multipole under optical excitation. Our theoretical calculations reproduce well all sharp features in the spin perpendicular resonance spectra, and shine light on the complex dynamics of spin multipoles in these kinds of solid-state systems.
  arXiv  Detail & Related papers  (2024-04-11T16:59:03Z)
• Sensing of magnetic field effects in radical-pair reactions using a quantum sensor [50.591267188664666]
  Magnetic field effects (MFE) in certain chemical reactions have been well established in the last five decades. We employ elaborate and realistic models of radical-pairs, considering its coupling to the local spin environment and the sensor. For two model systems, we derive signals of MFE detectable even in the weak coupling regime between radical-pair and NV quantum sensor.
  arXiv  Detail & Related papers  (2022-09-28T12:56:15Z)
• Probing dynamics of a two-dimensional dipolar spin ensemble using single qubit sensor [62.997667081978825]
  We experimentally investigate individual spin dynamics in a two-dimensional ensemble of electron spins on the surface of a diamond crystal. We show that this anomalously slow relaxation rate is due to the presence of strong dynamical disorder. Our work paves the way towards microscopic study and control of quantum thermalization in strongly interacting disordered spin ensembles.
  arXiv  Detail & Related papers  (2022-07-21T18:00:17Z)
• The coherence of quantum dot confined electron- and hole-spin in low external magnetic field [0.0]
  We show for the first time that the spin purity performs complex temporal oscillations. Our studies are essential for the design and optimization of quantum-dot-based entangled multi-photon sources.
  arXiv  Detail & Related papers  (2021-08-11T12:00:30Z)
• Anisotropic electron-nuclear interactions in a rotating quantum spin bath [55.41644538483948]
  Spin-bath interactions are strongly anisotropic, and rapid physical rotation has long been used in solid-state nuclear magnetic resonance. We show that the interaction between electron spins of nitrogen-vacancy centers and a bath of $13$C nuclear spins introduces decoherence into the system. Our findings offer new insights into the use of physical rotation for quantum control with implications for quantum systems having motional and rotational degrees of freedom that are not fixed.
  arXiv  Detail & Related papers  (2021-05-16T06:15:00Z)
• 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)
• Spin Entanglement and Magnetic Competition via Long-range Interactions in Spinor Quantum Optical Lattices [62.997667081978825]
  We study the effects of cavity mediated long range magnetic interactions and optical lattices in ultracold matter. We find that global interactions modify the underlying magnetic character of the system while introducing competition scenarios. These allow new alternatives toward the design of robust mechanisms for quantum information purposes.
  arXiv  Detail & Related papers  (2020-11-16T08:03:44Z)

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.