Unsplit Spreading: An Overlooked Signature of Long-Range Interaction

• URL: http://arxiv.org/abs/2601.15752v1
• Date: Thu, 22 Jan 2026 08:24:57 GMT
• Title: Unsplit Spreading: An Overlooked Signature of Long-Range Interaction
• Authors: Jian-Feng Wu, Yi Huang, Yu-Xiang Zhang,
• Abstract summary: Unsplit spreading can occur only when $(k)$ develops singular features, precisely what long-range interactions enable.<n>We show that unsplit spreading emerges in realistic open quantum systems, such as 1D and 2D subwavelength atomic arrays.<n>Our work establishes unsplit spreading as an experimentally accessible, smoking-gun signature of singular band structure induced by long-range physics.
• Score: 13.490631794544166
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In conventional lattice models, the dispersion relation $ω(k)$ is assumed to be a smooth function. We prove that this smoothness implies the splitting of an initially localized excitation into counter-propagating wave packets. Consequently, unsplit spreading can occur only when $ω(k)$ develops singular features, precisely what long-range interactions enable. Remarkably, this phenomenon was clearly visible in published quantum simulation experiments as early as 2014, yet it has remained unrecognized or discussed as a distinct physical effect. We show that unsplit spreading emerges in realistic open quantum systems, such as 1D and 2D subwavelength atomic arrays, where the long-lived subradiant states host effective dispersion with the required singularities. Our work establishes unsplit spreading as an experimentally accessible, smoking-gun signature of singular band structure induced by long-range physics.

Related papers

• 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)
• A Dough-Like Model for Understanding Double-Slit Phenomena [0.0]
  We introduce a Double Slit Diffraction Surrogate Model DSM based on deep learning.<n>By comparing the interpretability of paths and interference, we propose an intuitive physical analogy.<n>Our approach offers a novel, physically interpretable perspective on quantum superposition and measurement induced collapse.
  arXiv  Detail & Related papers  (2025-12-17T19:58:51Z)
• Freeness Reined in by a Single Qubit [36.94429692322632]
  We find that, even in this setting, the correlation functions predicted by free probability theory receive corrections of order $O(1)$.<n>We trace their origin to non-uniformly distributed stationary quantum states, which we characterize analytically and confirm numerically.
  arXiv  Detail & Related papers  (2025-12-15T19:00:09Z)
• Unveiling non-Hermitian band structures with non-Bloch supercells [23.45255537572689]
  Non-Hermitian systems exhibit complex band structures where both energy and momentum have imaginary parts.<n>We introduce a non-Bloch supercell framework designed to overcome this challenge by decoupling Bloch phase control from the imaginary part of momentum.
  arXiv  Detail & Related papers  (2025-10-23T03:18:23Z)
• Fock-space delocalization and the emergence of the Porter-Thomas distribution from dual-unitary dynamics [0.0]
  chaotic dynamics of quantum many-body systems are expected to quickly randomize any structured initial state. We study the spreading of an initial product state in Hilbert space under dual-unitary dynamics.
  arXiv  Detail & Related papers  (2024-08-05T18:00:03Z)
• Quantized Thouless pumps protected by interactions in dimerized Rydberg tweezer arrays [41.94295877935867]
  In the noninteracting case, quantized Thouless pumps can only occur when a topological singularity is encircled adiabatically. In the presence of interactions, such topological transport can even persist for exotic paths in which the system gets arbitrarily close to the noninteracting singularity.
  arXiv  Detail & Related papers  (2024-02-14T16:58:21Z)
• $N$ Scaling of Large-Sample Collective Decay in Inhomogeneous Ensembles [44.99833362998488]
  We experimentally study collective decay of an extended disordered ensemble of $N$ atoms inside a hollow-core fiber. We observe up to $300$-fold enhanced decay rates, strong optical bursts and a coherent ringing.
  arXiv  Detail & Related papers  (2023-07-21T14:43:29Z)
• Robustness and eventual slow decay of bound states of interacting microwave photons in the Google Quantum AI experiment [0.0]
  A recent Google Quantum AI experiment demonstrated the persistence of such collective excitations even when the integrability is broken. We study the spectrum of the model realized in the experiment using exact diagonalization and physical arguments. We find that isolated bands corresponding to the descendants of the exact bound states of the integrable model are clearly observable in the spectrum for a large range of system sizes.
  arXiv  Detail & Related papers  (2023-07-20T18:00:30Z)
• Collective Radiative Interactions in the Discrete Truncated Wigner Approximation [0.0]
  Superradiance of atomic arrays at sub-wavelength spacings has regained substantial interest. We develop a semiclassical approach to this problem that allows to describe the coherent and dissipative many-body dynamics of interacting spins. For small arrays we compare to exact simulations and a second order cumulant expansion. We conclude by studying the radiative properties of a spatially extended three-dimensional, coherently driven gas.
  arXiv  Detail & Related papers  (2023-05-31T13:11:32Z)
• Ergodicity breaking in an incommensurate system observed by OTOCs and Loschmidt Echoes: From quantum diffusion to sub-diffusion [0.0]
  We propose a new observable to study the transition in a spin chain under the disorder'' of a Harper-Hofstadter-Aubry-Andr'e on-site potential. In the absence of many-body interactions, the ZOGE coincides with the inverse participation ratio of a Fermionic wave function.
  arXiv  Detail & Related papers  (2021-06-14T12:41:32Z)
• Visualizing spinon Fermi surfaces with time-dependent spectroscopy [62.997667081978825]
  We propose applying time-dependent photo-emission spectroscopy, an established tool in solid state systems, in cold atom quantum simulators. We show in exact diagonalization simulations of the one-dimensional $t-J$ model that the spinons start to populate previously unoccupied states in an effective band structure. The dependence of the spectral function on the time after the pump pulse reveals collective interactions among spinons.
  arXiv  Detail & Related papers  (2021-05-27T18:00:02Z)
• Zitterbewegung and Klein-tunneling phenomena for transient quantum waves [77.34726150561087]
  We show that the Zitterbewegung effect manifests itself as a series of quantum beats of the particle density in the long-time limit. We also find a time-domain where the particle density of the point source is governed by the propagation of a main wavefront. The relative positions of these wavefronts are used to investigate the time-delay of quantum waves in the Klein-tunneling regime.
  arXiv  Detail & Related papers  (2020-03-09T21:27:02Z)

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.