Exploring kinetically induced bound states in triangular lattices with ultracold atoms: spectroscopic approach
arXiv:2312.00768 · doi:10.21468/SciPostPhys.16.3.081
Abstract
Quantum simulations with ultracold fermions in triangular optical lattices have recently emerged as a new platform for studying magnetism in frustrated systems. Experimental realizations of the Fermi Hubbard model revealed striking contrast between magnetism in bipartite and triangular lattices. In bipartite lattices magnetism peaks at half filling, and doped charge carriers tend to suppress magnetic correlations. In triangular lattices for large , magnetism is enhanced by doping away from because kinetic energy of dopants can be lowered through developing magnetic correlations. This corresponds to formation of magnetic polarons, with hole and doublon doping resulting in antiferro- and ferromagnetic polarons respectively. Snapshots obtained with quantum gas microscopes revealed formation of magnetic polarons around dopants at temperatures exceeding the superexchange energy scale. In this work we discuss theoretically that additional insight into properties of magnetic polarons can be achieved using spectroscopic experiments with ultracold atoms. We consider starting from a spin polarized state with small hole doping and applying a two-photon Raman photoexcitation, which transfers atoms into a different spin state. We show that such magnon injection spectra exhibit a separate peak corresponding to formation of a bound state between a hole and a magnon. This polaron peak is separated from the simple magnon spectrum by energy proportional to single particle tunneling and can be easily resolved with currently available experimental techniques. For some momentum transfer there is an additional peak corresponding to photoexciting a bound state between two holes and a magnon. We point out that in two component Bose mixtures in triangular lattices one can also create dynamical magnetic polarons, with one hole and one magnon forming a repulsive bound state.
17+2 pages and 7+3 figures
References in corpus (32)
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Using photoemission spectroscopy to probe a strongly interacting Fermi gas
- Attractive and repulsive Fermi polarons in two dimensions
- The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate
- Determination of the Superfluid Gap in Atomic Fermi Gases by Quasiparticle Spectroscopy
- Bragg spectroscopy of a strongly interacting Fermi gas
- Spectral Function for the S=1 Heisenberg Antiferromagetic Chain
- Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
- Exploring correlated 1D Bose gases from the superfluid to the Mott-insulator state by inelastic light scattering
- Determination of the Fermion Pair Size in a Resonantly Interacting Superfluid
- Detecting the Amplitude Mode of Strongly Interacting Lattice Bosons by Bragg Scattering
- Two and Three-body Contacts in the Unitary Bose Gas
- Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
- Probing nearest-neighbor correlations of ultracold fermions in an optical lattice
- Frustration- and doping-induced magnetism in a Fermi-Hubbard simulator
- Kinetic Magnetism in Triangular Moiré Materials
- Lanczos algorithm with Matrix Product States for dynamical correlation functions
- Mediated interactions between Fermi polarons and the role of impurity quantum statistics
- Exciton-polaron interactions in monolayer WS
- Observation of the Leggett-Rice effect in a unitary Fermi gas
- Itinerant spin polaron and metallic ferromagnetism in semiconductor moiré superlattices
- Triangular lattice Hubbard model physics at intermediate temperatures
- Hole in the 2D Ising Antiferromagnet: Origin of the Incoherent Spectrum
- Pairing of holes by confining strings in antiferromagnets
- Polarons and bipolarons in a two-dimensional square lattice
- Holes and magnetic polarons in a triangular lattice antiferromagnet
- Quantum gas microscopy of a geometrically frustrated Hubbard system
- Pseudogap metal and magnetization plateau from doping moiré Mott insulator
- Dichotomy of heavy and light pairs of holes in the model