Characterizing quasiparticles in strongly correlated systems using nonlinear spectroscopy in quantum simulators
Abstract
Characterizing carrier type in strongly correlated quantum systems conventionally relies on the Hall effect. In cold-atom quantum simulators, implementing Hall transport measurements typically requires synthetic gauge fields, which introduces significant heating. Here, we present nonlinear spectroscopic and fluctuation-based protocols that establish an alternative route to identifying the sign of quasiparticle charge. We demonstrate that second-order density and current responses to finite-momentum quenches and drives-as well as equilibrium third-order density cumulants-distinguish electron- from hole-like quasiparticles. For a Fermi-Hubbard multi-leg ladder on a square lattice, numerical simulations reveal a crossover from hole- to electron-like carriers upon hole-doping away from half-filling, matching the sign change in the Hall coefficient. To demonstrate the applicability of our protocols beyond fermionic systems, we show that the nonlinear density response to a finite-momentum, finite-frequency drive reveals the sign of charge carriers in a hard-core boson ladder, and that the nonlinear signal can be significantly enhanced when driving near resonance with a nonlinear collective mode. Our results establish nonlinear density and current response and equilibrium non-Gaussian fluctuations as complementary probes, offering quantum simulators a direct route to characterize the carrier sign, without the experimental hurdles of conventional transport setups.
Related
- Characterizing Local and Correlated Pauli Noise in Quantum Teleportation Circuits
- X-Ray Spectroscopy for Characterizing Stimulated Raman Scattering in Inertial Confinement Fusion
- Theoretical estimation of nonlinear response function and ultrafast optical spectroscopy of nitrogen vacancy centers
- Nonlinear Photocurrent Spectroscopy and Polarization-Tunable Shift Current in the Layered Semiconductor CuScP2S6
- Fiber-based electro-optic dual-comb light source for fast linear and nonlinear spectroscopy
BibTeX
@misc{skolc2026characterizing,
title = {{Characterizing quasiparticles in strongly correlated systems using nonlinear spectroscopy in quantum simulators}},
author = {Luka Skolc and Utso Bhattacharya and Jonathan B. Curtis and Immanuel Bloch and Eugene Demler},
howpublished = {arXiv},
year = {2026},
month = sep,
doi = {10.48550/arxiv.2609.30124},
eprint = {2609.30124},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2609.30124},
}
RIS
TY - UNPB
TI - Characterizing quasiparticles in strongly correlated systems using nonlinear spectroscopy in quantum simulators
AU - Luka Skolc
AU - Utso Bhattacharya
AU - Jonathan B. Curtis
AU - Immanuel Bloch
AU - Eugene Demler
PY - 2026
DA - 2026/09/24
PB - arXiv
DO - 10.48550/arxiv.2609.30124
UR - https://arxiv.org/abs/2609.30124
AB - Characterizing carrier type in strongly correlated quantum systems conventionally relies on the Hall effect. In cold-atom quantum simulators, implementing Hall transport measurements typically requires synthetic gauge fields, which introduces significant heating. Here, we present nonlinear spectroscopic and fluctuation-based protocols that establish an alternative route to identifying the sign of quasiparticle charge. We demonstrate that second-order density and current responses to finite-momentum quenches and drives-as well as equilibrium third-order density cumulants-distinguish electron- from hole-like quasiparticles. For a Fermi-Hubbard multi-leg ladder on a square lattice, numerical simulations reveal a crossover from hole- to electron-like carriers upon hole-doping away from half-filling, matching the sign change in the Hall coefficient. To demonstrate the applicability of our protocols beyond fermionic systems, we show that the nonlinear density response to a finite-momentum, finite-frequency drive reveals the sign of charge carriers in a hard-core boson ladder, and that the nonlinear signal can be significantly enhanced when driving near resonance with a nonlinear collective mode. Our results establish nonlinear density and current response and equilibrium non-Gaussian fluctuations as complementary probes, offering quantum simulators a direct route to characterize the carrier sign, without the experimental hurdles of conventional transport setups.
ER -