Observation of an emergent energy scale close to dimensional reduction in a quasi-two-dimensional quantum magnet

• URL: http://arxiv.org/abs/2607.23547v1
• Date: Sun, 26 Jul 2026 08:58:26 GMT
• Title: Observation of an emergent energy scale close to dimensional reduction in a quasi-two-dimensional quantum magnet
• Abstract summary: We report on experimental observation of a characteristic massive spectrum close to transverse field-induced dimensional reduction.<n>Results demonstrate the power of integrable field theory in describing emergent many-body quantum critical phenomena in condensed matter systems.
• Score: 2.8268667554072597
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: By appropriately perturbing a critical transverse-field Ising chain away from its critical point, the system can develop a finite correlation length with a characteristic purely massive spectrum, whose ratios and correlations are precisely described by an integrable field theory and an infinite set of integrals of motion corresponding to the $E_8$ Lie algebra. In this work, we report on experimental observation of a characteristic massive spectrum close to transverse field-induced dimensional reduction in a quasi-two-dimensional quantum magnet Cu$_2$(OH)$_3$Br, providing evidence for an emergent $E_8$ symmetry and the corresponding excitations of bound states in the sublattice of its ferromagnetic chains. These results demonstrate the power of integrable field theory in describing emergent many-body quantum critical phenomena in condensed matter systems.

Related papers

• Geometric curvature driven by many-body collective fluctuations [45.88028371034407]
  Recently, it has been emphasized that quantum geometry can be interpreted in terms of quantum dipole fluctuations in the ground state driven by interband mixing.<n>Here, we extend this picture to include contributions from many-body collective fluctuations.<n>We show that contributions from collective fluctuations can be experimentally distinguished from bare band-geometric contributions.
  arXiv  Detail & Related papers  (2026-05-19T13:13:37Z)
• A two-dimensional realization of the parity anomaly [0.0]
  Quantum anomalies arise when symmetries of a classical theory cannot be preserved upon quantization.<n>A prominent example is the parity anomaly of a single two-dimensional Dirac fermion, which enforces a half-quantized Hall response.<n>We report the observation of a parity-anomalous Hall response at the critical point of a quantum Hall phase transition in a synthetic two-dimensional system of ultracold dysprosium atoms.
  arXiv  Detail & Related papers  (2026-03-23T16:34:45Z)
• Hysteretic squashed entanglement in many-body quantum systems [42.085941481155295]
  Entanglement in many-body quantum systems is distributed across spatial regions.<n>We propose hysteretic entanglement $T_sq$, a conditional entanglement that measures the genuine quantum correlations between two subregions.<n>We show that $T_sq$ can detect genuine quantum correlations across both adjacent and long-range subsystems.
  arXiv  Detail & Related papers  (2026-03-10T17:00:49Z)
• Symmetry-protected topology and deconfined solitons in a multi-link $\mathbb{Z}_2$ gauge theory [45.88028371034407]
  We study a $mathbbZ$ lattice gauge theory defined on a multi-graph with links that can be visualized as great circles of a spherical shell.<n>We show that this leads to state-dependent tunneling amplitudes underlying a phenomenon analogous to the Peierls instability.<n>By performining a detailed analysis based on matrix product states, we prove that charge deconfinement emerges as a consequence of charge-fractionalization.
  arXiv  Detail & Related papers  (2026-03-02T22:59:25Z)
• Meson spectroscopy of exotic symmetries of Ising criticality in Rydberg atom arrays [39.58317527488534]
  Coupling two Ising chains in a ladder leads to an even richer $mathcalD(1)_8$ symmetries.<n>Here, we probe these emergent symmetries in a Rydberg atom processing unit, leveraging its geometry to realize both chain and ladder configurations.
  arXiv  Detail & Related papers  (2025-06-26T14:19:30Z)
• Corner Charge Fluctuation as an Observable for Quantum Geometry and Entanglement in Two-dimensional Insulators [0.5120567378386615]
  We show that for generic lattice systems of interacting particles, the corner charge fluctuation is directly related to quantum geometry.<n>A model of a compact obstructed atomic insulator is introduced to illustrate this effect analytically.<n> numerical verification for various Chern insulator models further demonstrate the experimental relevance of the corner charge fluctuation in a finite-size quantum simulator.
  arXiv  Detail & Related papers  (2024-06-24T18:00:03Z)
• Thermal masses and trapped-ion quantum spin models: a self-consistent approach to Yukawa-type interactions in the $λ\!φ^4$ model [44.99833362998488]
  A quantum simulation of magnetism in trapped-ion systems makes use of the crystal vibrations to mediate pairwise interactions between spins. These interactions can be accounted for by a long-wavelength relativistic theory, where the phonons are described by a coarse-grained Klein-Gordon field. We show that thermal effects, which can be controlled by laser cooling, can unveil this flow through the appearance of thermal masses in interacting QFTs.
  arXiv  Detail & Related papers  (2023-05-10T12:59:07Z)
• Localization and melting of interfaces in the two-dimensional quantum Ising model [0.0]
  We study the non-equilibrium evolution of coexisting ferromagnetic domains in the two-dimensional quantum Ising model. We demonstrate that the quantum-fluctuating interface delimiting a large bubble can be studied as an effective one-dimensional system.
  arXiv  Detail & Related papers  (2022-03-17T17:48:51Z)
• Unlocking the general relationship between energy and entanglement spectra via the wormhole effect [4.56850520666667]
  We develop a scheme to overcome the exponential growth of computational complexity in reliably extracting low-lying entanglement spectrum from quantum Monte Carlo simulations. We show that the wormhole effect amplifies the bulk energy gap by a factor of $beta$, the relative strength of that with respect to the edge energy gap will determine the behavior of low-lying entanglement spectrum of the system.
  arXiv  Detail & Related papers  (2021-12-11T00:48:02Z)
• Quantum correlations, entanglement spectrum and coherence of two-particle reduced density matrix in the Extended Hubbard Model [62.997667081978825]
  We study the ground state properties of the one-dimensional extended Hubbard model at half-filling. In particular, in the superconducting region, we obtain that the entanglement spectrum signals a transition between a dominant singlet (SS) to triplet (TS) pairing ordering in the system.
  arXiv  Detail & Related papers  (2021-10-29T21:02:24Z)
• Exact thermal properties of free-fermionic spin chains [68.8204255655161]
  We focus on spin chain models that admit a description in terms of free fermions. Errors stemming from the ubiquitous approximation are identified in the neighborhood of the critical point at low temperatures.
  arXiv  Detail & Related papers  (2021-03-30T13:15:44Z)
• Quantum particle across Grushin singularity [77.34726150561087]
  We study the phenomenon of transmission across the singularity that separates the two half-cylinders. All the local realisations of the free (Laplace-Beltrami) quantum Hamiltonian are examined as non-equivalent protocols of transmission/reflection. This allows to comprehend the distinguished status of the so-called bridging' transmission protocol previously identified in the literature.
  arXiv  Detail & Related papers  (2020-11-27T12:53:23Z)
• Fractional quantum Hall physics and higher-order momentum correlations in a few spinful fermionic contact-interacting ultracold atoms in rotating traps [0.0]
  This paper provides benchmark results for $N$-body spin-unresolved, as well as spin-resolved, momentum correlations measurable in time-of-flight experiments with individual particle detection. The application of a small perturbing stirring potential induces, at the ensuing avoided crossings, formation of symmetry broken states exhibiting ordered polygonal-ring structures. Analysis of the calculated LLL wavefunction enables a two-dimensional generalization of the Girardeau one-dimensional 'fermionization' scheme, originally invoked for mapping of bosonic-type wave functions to those of spinless fermions.
  arXiv  Detail & Related papers  (2020-06-17T02:08:13Z)

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.