Two-channel physics in a lightly doped antiferromagnetic Mott insulator revealed by two-hole spectroscopy

• URL: http://arxiv.org/abs/2603.13222v1
• Date: Fri, 13 Mar 2026 17:57:02 GMT
• Title: Two-channel physics in a lightly doped antiferromagnetic Mott insulator revealed by two-hole spectroscopy
• Abstract summary: We perform ultra-high resolution numerical simulations of spectral functions in the highly underdoped $t-J$ model.<n>We discover two coupled branches of hole pairs emerging at low energies in the largely unexplored two-particle spectrum.<n>Our work establishes two-particle spectroscopy, beyond single-particle Green's functions, as a powerful tool for revealing the microscopic origins of unconventional superconductivity.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Understanding pairing in the strong-coupling regime of doped Mott insulators remains an open problem in the context of cuprate superconductors. We perform ultra-high resolution numerical simulations of spectral functions in the highly underdoped $t-J$ model and discover two coupled branches of hole pairs emerging at low energies in the largely unexplored two-particle spectrum. As spin anisotropy is tuned from the Ising limit to the $SU(2)$-symmetric Heisenberg regime, the lowest $d$-wave pair evolves from a single bipolaronic branch into two hybridized branches separated by an avoided crossing. We explain this behaviour using an effective two-channel model involving a tightly bound bipolaronic state and a second channel associated with two magnetic polarons. The model reproduces the qualitative low-energy spectra and implies near-resonant $d$-wave interactions in the $SU(2)$-symmetric $t-J$ model, consistent with proximity to an emergent Feshbach-type resonance. To probe these predictions experimentally, we propose a Raman spectroscopy scheme for the attractive Hubbard model that can be directly implemented using ultracold atoms in optical lattices. Our work establishes two-particle spectroscopy, beyond single-particle Green's functions, as a powerful tool for revealing the microscopic origins of unconventional superconductivity.

Related papers

• Programmable spectral symmetries in an anisotropic quantum Rabi simulator [23.8573887639585]
  We realize a programmable anisotropic quantum Rabi model in a superconducting processor.<n>We show that anisotropy reconstructs the spectrum and turns complete collapse-revival dynamics into incomplete revivals even near degeneracy.
  arXiv  Detail & Related papers  (2026-06-03T17:08:27Z)
• Bound, antibound and resonance two-photon states in chiral waveguide QED [51.56484100374058]
  We present a theoretical study of the two-particle spectrum $(K)$ for the chiral waveguide QED setup.<n>For each pair center-of-mass momentum $K$ there exist distinct solutions with $Imle 0$ in the two-particle spectrum.<n>An interesting finding is that the real part of the spectrum $Re (K)$ in the chiral model is gapless.
  arXiv  Detail & Related papers  (2026-04-22T14:19:46Z)
• 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)
• Evidence for Multimodal Superfluidity of Neutrons [33.960965008651684]
  We show that the condensate consists of coexisting s-wave pairs, p-wave pairs in entangled double pair combinations, and quartets composed of bound states of two s-wave pairs.<n>We identify multimodal superfluidity as a general feature of single-flavor spin-1/2 fermionic systems with attractive s-wave and p-wave interactions.
  arXiv  Detail & Related papers  (2026-02-19T18:36:50Z)
• A Hybrid Jump-Diffusion Model for Coherent Optical Control of Quantum Emitters in hBN [36.9794819679151]
  Hexagonal boron nitride (hBN) has emerged as a promising two-dimensional host for stable single-photon emission.<n>We present a simulation-based study of temperature-dependent spectral dynamics and optical coherence in a mechanically decoupled quantum emitter in hBN.
  arXiv  Detail & Related papers  (2026-01-28T13:23:28Z)
• A two-mode model for black hole evaporation and information flow [0.0]
  We analyze a two-oscillator model for black hole evaporation in which an effective geometric degree of freedom and a representative Hawking radiation mode are described.<n>We show that even a minimal two-mode framework can capture key qualitative features of energy transfer and information flow during evaporation.
  arXiv  Detail & Related papers  (2026-01-27T15:57:59Z)
• Repulsively Bound Hadrons in a $\mathbb{Z}_2$ Lattice Gauge Theory [14.919248418949065]
  We show that resonant pair-production terms give rise to an additional repulsive binding mechanism that forms a stable hadron'' bound state of two mesons.<n>A high-energy state, the hadron is stabilized by being off-resonantly coupled to a continuum.<n>Our findings are amenable to experimental observation on modern quantum hardware from superconducting qubits to trapped ions.
  arXiv  Detail & Related papers  (2025-10-21T18:00:03Z)
• Spinon Singlet: Microscopic Mechanism of $d$-Wave Pairing in a Partially-Filled Stripe [2.8060709233558647]
  We show that two spinons with opposite chiralities tend to spontaneously pair into a singlet state, which naturally gives rise to the $d$-wave pairing pattern.<n>Our work offers new insights into the role of orders in mediating $d$-wave superconductivity and paves the way for further exploration of multi-stripe-mediated pairing mechanisms in the Fermi-Hubbard model.
  arXiv  Detail & Related papers  (2025-07-25T02:24:37Z)
• Emergent Kitaev materials in synthetic Fermi-Hubbard bilayers [45.88028371034407]
  Bond-directional spin-spin interactions in a Fermi-Hubbard bilayer can be realized with ultracold fermions in Raman optical lattices.<n>We analyze the Fermi-liquid and Mott-insulating phases, highlighting a correspondence between Dirac and Majorana quasi-particles.<n>Our results establish that cold-atom quantum simulators based on Raman optical lattices can be a playground for extended Kitaev models.
  arXiv  Detail & Related papers  (2025-04-22T10:07:56Z)
• Homogeneous fermionic Hubbard gases in a flat-top optical lattice [9.357258889345438]
  We develop a hybrid potential that integrates a flat-top optical lattice with an optical box trap.<n>We capture a well-defined energy band occupation that aligns perfectly with the theoretical calculations for a zero-temperature fermionic Hubbard model.<n>We observe a non-monotonic temperature dependence in $D$, revealing the Pomeranchuk effect.
  arXiv  Detail & Related papers  (2025-02-12T04:06:31Z)
• Feshbach hypothesis of high-Tc superconductivity in cuprates [0.0]
  We present a Feshbach perspective on the origin of strong pairing in Fermi-Hubbard type models. Existing experimental and numerical results on hole-doped cuprates lead us to conjecture the existence of a light, long-lived, low-energy excited state of two holes. The emergent Feshbach resonance we propose could also underlie superconductivity in other doped antiferromagnetic Mott insulators.
  arXiv  Detail & Related papers  (2023-12-05T18:59:59Z)
• Scattering theory of mesons in doped antiferromagnetic Mott insulators: Multichannel perspective and Feshbach resonance [0.0]
  Superconductivity at comparatively high temperatures upon hole doping an antiferromagnetic (AFM) Mott insulator. Recently, it has been proposed that at strong coupling and low doping, the fundamental one- and two-hole meson-type constituents -- magnetic polarons and bipolaronic pairs -- likely realize an emergent Feshbach resonance.
  arXiv  Detail & Related papers  (2023-12-05T18:59:52Z)
• Generalization of the Tavis-Cummings model for multi-level anharmonic systems: insights on the second excitation manifold [0.0]
  This work contrasts predictions from the Tavis-Cummings (TC) model, in which the material is a collection of two-level systems. We simplify the brute-force diagonalization of a gigantic $N2times N2$ Hamiltonian. We find resonant conditions between bipolaritons and anharmonic transitions where two-photon absorption can be enhanced.
  arXiv  Detail & Related papers  (2022-02-03T06:33:42Z)

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.