Collective amplification and anisotropic narrowing of alignment signals in cesium vapor under strong spin exchange near zero magnetic field

• URL: http://arxiv.org/abs/2605.13466v2
• Date: Mon, 18 May 2026 11:44:08 GMT
• Title: Collective amplification and anisotropic narrowing of alignment signals in cesium vapor under strong spin exchange near zero magnetic field
• Abstract summary: We show that the anisotropy of the Hanle resonances in the plane perpendicular to the pump beam increases with concentration.<n>With a further increase in concentration, additional nonlinear effects arise, such as signal amplification, bistability, polarization and memory.<n>The unique properties of these resonances, such as their extremely small width and magnetic field-controlled bistability with a long-term memory effect, make them promising for use in quantum sensing and information.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We present the results of an experimental study of the anomalous anisotropy of alignment signals in cesium vapors under strong spin-exchange conditions near zero magnetic field with linearly polarized optical pumping. We show that the anisotropy of the Hanle resonances in the plane perpendicular to the pump beam increases with concentration: in one direction the widths remain broadened by spin-exchange, whereas in the other they approach the spin-exchange relaxation free limit. With a further increase in concentration, additional nonlinear effects arise, such as signal amplification, bistability, hysteresis, and memory. To explain these effects we construct a illustrative theoretical model incorporating spontaneous polarization effects under strong spin exchange conditions. The model qualitatively shows that the ultra-narrow alignment resonances may originate from quadrupole anisotropy arising from the projection of spontaneous transverse orientation onto the detection axis. The unique properties of these resonances, such as their extremely small width and magnetic field-controlled bistability with a long-term memory effect, make them promising for use in quantum sensing and information.

Related papers

• A tunable feedback-controlled magnetic trap for a magnet in free fall [41.89902918118875]
  We propose and demonstrate a novel master proportional-integral-differential magnetic trap (MPIDMT)<n>During the microgravity phase the system stably levitates a ferromagnetic particle against shock accelerations up to 1.5 g and resolves its motion in both a low-field (0.4 g) configuration and in pure free fall.<n>Results represent a key step toward free-fall ferromagnetic magnetometry, the long-sought direct observation of macroscopic Larmor precession, and future space-based experiments.
  arXiv  Detail & Related papers  (2026-05-31T06:56:41Z)
• Giant magneto-optical rotation in a Rydberg atomic gas via symmetry-breaking wave mixing [2.116696202325112]
  In conventional single-beam excitation systems, the propagation of the nonlinear signal is restricted by an energy-symmetry-induced propagation blockade.<n>We propose introducing a far-detuned, counterpropagating wave-mixing field into an ultracold five-level Rydberg atomic gas.<n>This symmetry-breaking mechanism breaks the propagation blockade, enabling efficient utilization of the nonlocal Rydberg Kerr effect.
  arXiv  Detail & Related papers  (2026-05-31T05:42:17Z)
• 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)
• Direct observation of the optical Magnus effect with a trapped ion [0.0]
  We map an optical analog of the Magnus effect, where intrinsic spin-orbit-like coupling of light generates a spin-dependent transverse displacement of the atom-light interaction profile for a $40$Ca$+$ ion.<n>The results establish the physical basis of polarization-gradient interactions relevant to optical tweezer-based quantum control.
  arXiv  Detail & Related papers  (2026-01-30T13:44:08Z)
• Vacuum birefringence in the polarized X-ray emission of a radio magnetar [27.308408027453012]
  The quantum electrodynamics (QED) theory predicts that the quantum vacuum becomes birefringent in the presence of ultra-strong magnetic fields.<n>Here, we report phase- and energy-resolved X-ray polarization measurements of the radio-emitting magnetar 1E 1547.0-5408.
  arXiv  Detail & Related papers  (2025-09-23T18:01:21Z)
• 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)
• Generalized Gouy Rotation of Electron Vortex beams in uniform magnetic fields [54.010858975226945]
  The intrinsic rotation of electron vortex beams has been experimentally observed in magnetic fields by breaking the beam's cylindrical symmetry.<n>We introduce and derive the generalized Gouy rotation angle, which links the Gouy phase of an extended Landau state to the experimentally observed angular variation.<n>Our results are, in principle, applicable to any system involving electron vortex beams in uniform magnetic fields.
  arXiv  Detail & Related papers  (2024-07-03T03:29:56Z)
• 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)
• Spin relaxation in inhomogeneous magnetic fields with depolarizing boundaries [24.03686690579752]
  Field-inhomogeneity-induced relaxation of atomic spins confined in vapor cells with depolarizing walls is studied.<n>In contrast to nuclear spins, such as noble-gas spins, atomic spins in uncoated cells undergo randomization at the boundaries.<n>A deviation in high input-power scenarios arises from pump field attenuation, resulting in a non-uniformly distributed light shift.
  arXiv  Detail & Related papers  (2024-03-13T07:15:50Z)
• Spin projection noise and the magnetic sensitivity of optically pumped magnetometers [0.0]
  We present a new approach for calculating the spin projection noise (SPN)-limited signal to noise ratio (SNR) and the magnetic sensitivity of OPMs. Our model is based solely on the mean-field density matrix dynamics. We report on a new SERF feature; the reduction of spin-projection noise at the spin precession frequency as a consequence of strongly-correlated hyperfine spins.
  arXiv  Detail & Related papers  (2024-02-16T15:11:46Z)
• Magnetic polarons beyond linear spin-wave theory: Mesons dressed by magnons [0.0]
  We develop a quantitative theoretical formalism to describe magnetic polarons in the strong coupling regime. We construct an effective Hamiltonian with weak coupling to the spin-wave excitations in the background. Our work paves the way for exploring magnetic polarons out-of equilibrium or in frustrated systems.
  arXiv  Detail & Related papers  (2024-01-31T19:14:17Z)
• 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)
• Creation and dynamics of spin fluctuations in a noisy magnetic field [0.0]
  We investigate the spin fluctuations induced in a thermal atomic ensemble by an external fluctuating uniaxial magnetic field. We show that additional spin noise is excited, which dramatically depends on the magnetic noise variance and bandwidth. We develop an analytical perturbative model proving that this spin noise first emerges from the residual optical pumping in the medium.
  arXiv  Detail & Related papers  (2023-09-06T11:20:46Z)
• 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)
• Measuring the magnon-photon coupling in shaped ferromagnets: tuning of the resonance frequency [50.591267188664666]
  cavity photons and ferromagnetic spins excitations can exchange information coherently in hybrid architectures. Speed enhancement is usually achieved by optimizing the geometry of the electromagnetic cavity. We show that the geometry of the ferromagnet plays also an important role, by setting the fundamental frequency of the magnonic resonator.
  arXiv  Detail & Related papers  (2022-07-08T11:28:31Z)
• Radio-frequency manipulation of state populations in an entangled fluorine-muon-fluorine system [0.0]
  Entangled spin states are created by implanting muons into single crystal LiY0.95Ho0.05F4. The resulting states have well-defined energy levels allowing experimental manipulation of the state populations.
  arXiv  Detail & Related papers  (2022-04-11T13:09:36Z)

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.