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.
arXiv comment17+2 pages and 7+3 figures
References in corpus (74)
- Angle-resolved photoemission spectroscopy of the cuprate superconductors
- A Mott insulator of fermionic atoms in an optical lattice
- Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
- Bragg spectroscopy of a Bose-Einstein condensate
- Observation of Fermi Polarons in a Tunable Fermi Liquid of Ultracold Atoms
- Electronic structure of quantum materials studied by angle-resolved photoemission spectroscopy
- Using photoemission spectroscopy to probe a strongly interacting Fermi gas
- Metastability and Coherence of Repulsive Polarons in a Strongly Interacting Fermi Mixture
- Observation of Attractive and Repulsive Polarons in a Bose-Einstein Condensate
- Attractive and repulsive Fermi polarons in two dimensions
- Excitation of phonons in a Bose-Einstein condensate by light scattering
- Bose polarons in the strongly interacting regime
- Efficient numerical simulations with Tensor Networks: Tensor Network Python (TeNPy)
- Resonant x-ray scattering studies of charge order in cuprates
- Ultrafast many-body interferometry of impurities coupled to a Fermi sea
- The `Higgs' Amplitude Mode at the Two-Dimensional Superfluid-Mott Insulator Transition
- Collective Oscillations of an Imbalanced Fermi Gas: Axial Compression Modes and Polaron Effective Mass
- Radio-Frequency Spectroscopy of Ultracold Fermions
- Repulsive Fermi polarons in a resonant mixture of ultracold Li atoms
- Momentum-Resolved Bragg Spectroscopy in Optical Lattices
- Bose polarons near quantum criticality
- 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
- Hole and Pair Structures in the t-J model
- Tomographic RF Spectroscopy of a Trapped Fermi Gas at Unitarity
- Boiling a Unitary Fermi Liquid
- Non-equilibrium quantum dynamics and formation of the Bose polaron
- 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
- Excitations of a Superfluid in a 3D Optical Lattice
- Ground state phase diagram of the doped Hubbard model on the 4-leg cylinder
- Variational Study of Fermionic and Bosonic Systems with Non-Gaussian States: Theory and Applications
- Two and Three-body Contacts in the Unitary Bose Gas
- Transverse Demagnetization Dynamics of a Unitary Fermi Gas
- Interacting Polaron-Polaritons
- Observation of Anomalous Spin Segregation in a Trapped Fermi Gas
- Universal spin dynamics in two-dimensional Fermi gases
- Probing nearest-neighbor correlations of ultracold fermions in an optical lattice
- Frustration- and doping-induced magnetism in a Fermi-Hubbard simulator
- Spatial resolution of spin waves in an ultra-cold gas
- Kinetic Magnetism in Triangular Moiré Materials
- Parton theory of magnetic polarons: Mesonic resonances and signatures in dynamics
- Ferromagnetism, paramagnetism and a Curie-Weiss metal in an electron doped Hubbard model on a triangular lattice
- Lanczos algorithm with Matrix Product States for dynamical correlation functions
- Observation of a smooth polaron-molecule transition in a degenerate Fermi gas
- Site-resolved imaging of ultracold fermions in a triangular-lattice quantum gas microscope
- Kinetic Antiferromagnetism in the Triangular Lattice
- On the Nagaoka polaron in the t-J model
- Observation of quantum-limited spin transport in strongly interacting two-dimensional Fermi gases
- Mediated interactions between Fermi polarons and the role of impurity quantum statistics
- Angle-resolved photoemission spectroscopy of a Fermi-Hubbard system
- Exciton-polaron interactions in monolayer WS
- Observation of the Leggett-Rice effect in a unitary Fermi gas
- Excitations of Bose-Einstein condensates in a one-dimensional periodic potential
- Origin of Strong Dispersion in Hubbard Insulators
- Itinerant spin polaron and metallic ferromagnetism in semiconductor moiré superlattices
- Pairing from strong repulsion in triangular lattice Hubbard model
- Classical Antiferromagnetism in Kinetically Frustrated Electronic Models
- Doping evolution of spin and charge excitations in the Hubbard model
- Triangular lattice Hubbard model physics at intermediate temperatures
- Engineering spin waves in a high-spin ultracold Fermi gas
- Quasiparticle collapsing in an anisotropic - ladder
- 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
- Quantum gas microscopy of a geometrically frustrated Hubbard system
- Holes and magnetic polarons in a triangular lattice antiferromagnet
- Fourier transform spectroscopy of a spin-orbit coupled Bose gas
- Influence of Magnetism and Correlation on the Spectral Properties of Doped Mott Insulators
- Pseudogap metal and magnetization plateau from doping moiré Mott insulator
- Dichotomy of heavy and light pairs of holes in the model