Frustration- and doping-induced magnetism in a Fermi–Hubbard simulator

Xu, Muqing; Kendrick, Lev; Kale, Anant; Gang, Youqi; Ji, Geoffrey; Scalettar, Richard; Lebrat, Martin; Greiner, Markus

doi:10.1038/s41586-023-06280-5

Cited by 43 publications

(6 citation statements)

References 56 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Non-local fermion pairing has been directly observed in an attractive gas made of fermionic K atoms, that in fact implements a Fermi-Hubbard model, and has allowed to investigate the BCS-BEC crossover including the formation of a pseudogap [575]. The Fermi-Hubbard model has been implemented also in a system of fermionic Lithium atoms in 2D optical lattices, and exploited to quantum simulate frustration-and doping-induced magnetism [576]. F the effective Fermi temperature built from the system density.…”

Section: Condensed Matter and Many-body Physicsmentioning

confidence: 99%

Atomic Quantum Technologies for Quantum Matter and Fundamental Physics Applications

Yago Malo,

Lepori,

Gentini

et al. 2024

Technologies

View full text Add to dashboard Cite

Physics is living an era of unprecedented cross-fertilization among the different areas of science. In this perspective review, we discuss the manifold impact that state-of-the-art cold and ultracold-atomic platforms can have in fundamental and applied science through the development of platforms for quantum simulation, computation, metrology and sensing. We illustrate how the engineering of table-top experiments with atom technologies is engendering applications to understand problems in condensed matter and fundamental physics, cosmology and astrophysics, unveil foundational aspects of quantum mechanics, and advance quantum chemistry and the emerging field of quantum biology. In this journey, we take the perspective of two main approaches, i.e., creating quantum analogues and building quantum simulators, highlighting that independently of the ultimate goal of a universal quantum computer to be met, the remarkable transformative effects of these achievements remain unchanged. We wish to convey three main messages. First, this atom-based quantum technology enterprise is signing a new era in the way quantum technologies are used for fundamental science, even beyond the advancement of knowledge, which is characterised by truly cross-disciplinary research, extended interplay between theoretical and experimental thinking, and intersectoral approach. Second, quantum many-body physics is unavoidably taking center stage in frontier’s science. Third, quantum science and technology progress will have capillary impact on society, meaning this effect is not confined to isolated or highly specialized areas of knowledge, but is expected to reach and have a pervasive influence on a broad range of society aspects: while this happens, the adoption of a responsible research and innovation approach to quantum technologies is mandatory, to accompany citizens in building awareness and future scaffolding. Following on all the above reflections, this perspective review is thus aimed at scientists active or interested in interdisciplinary research, providing the reader with an overview of the current status of these wide fields of research where cold and ultracold-atomic platforms play a vital role in their description and simulation.

show abstract

Section: Condensed Matter and Many-body Physicsmentioning

confidence: 99%

Atomic Quantum Technologies for Quantum Matter and Fundamental Physics Applications

Yago Malo,

Lepori,

Gentini

et al. 2024

Technologies

View full text Add to dashboard Cite

show abstract

“…|0〉| 2 and poles E n . To obtain a continuum version of the dynamical spin structure factor we employ a Lorentzian broadening,…”

Section: Lanzcos Algorithmmentioning

confidence: 99%

“…This makes them promising candidates for experimental studies with cold atoms simulators, which are still limited in how low they can go in temperature [1,82]. In particular, recent cold atom experiments have simulated the Hubbard model in the triangular lattice [2][3][4][86][87][88] and explored the emergence of kinetic magnetism with fermionic atoms loaded in triangular geometries [2]. Moreover, they also have reported the observation of antiferromagnetic and ferromagnetic polarons [3,4].…”

Section: Introductionmentioning

confidence: 99%

Exploring kinetically induced bound states in triangular lattices with ultracold atoms: Spectroscopic approach

Morera Navarro,

Weitenberg,

Sengstock

et al. 2024

SciPost Phys.

View full text Add to dashboard Cite

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 is strongest at half filling, and doped charge carriers tend to suppress magnetic correlations. In triangular-type lattices for large U/t and t>0, antiferromagnetism (ferromagnetism) gets enhanced by doping away from n=1 with holes (doublons) because kinetic energy of dopants can be lowered through developing magnetic correlations, corresponding to formation of magnetic polarons. Snapshots of many-body states obtained with quantum gas microscopes demonstrated existence of magnetic polarons by revealing the magnetic correlations around dopants at temperatures that considerably exceed superexchange energy scale. In this paper we discuss theoretically that additional insight into properties of magnetic polarons in triangular lattices 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.

show abstract

“…In addition to the SOC and crystal symmetry, other factors also contribute to the emergence of nontrivial topological properties. For example, geometric changes like lattice distortion can induce exotic physical properties, such as magnetism in a Fermi−Hubbard simulator, 35 topological order in 2D materials, 36 and distortion-enhanced strengthening in high-entropy alloys. 37 Recently, structural amorphization was theoretically confirmed to generate topological order 36 � random local distortion in structural amorphization results in a random distribution of the electron interaction.…”

Section: ■ Introductionmentioning

confidence: 99%

Synergistic Effect of Lattice Distortion and Random On-Site Energies in 2D Materials

Pei

2024

J. Phys. Chem. C

View full text Add to dashboard Cite

Two-dimensional quantum materials have attracted extensive attention since the discovery of single-layer graphene, partly due to the exotic physical properties of magic-angle twisted bilayer graphene. The nontrivial topology of band structures plays an essential role in the unique electronic properties due to strongly correlated electrons. Recently, structural amorphization was theoretically confirmed to induce topological orderrandom local distortion results in a random distribution of the electron interaction. Since structural distortion and chemical doping can change the on-site energies, we propose a new Hamiltonian to include the randomness in on-site energies and capture the effect of the Anderson localization on the emergence of topological insulating phases. We find that the randomness of on-site energies promotes the emergence of topological insulating phases and has a synergistic role with structural amorphization in the phase transition.

show abstract

Frustration- and doping-induced magnetism in a Fermi–Hubbard simulator

Cited by 43 publications

References 56 publications

Atomic Quantum Technologies for Quantum Matter and Fundamental Physics Applications

Atomic Quantum Technologies for Quantum Matter and Fundamental Physics Applications

Exploring kinetically induced bound states in triangular lattices with ultracold atoms: Spectroscopic approach

Synergistic Effect of Lattice Distortion and Random On-Site Energies in 2D Materials

Contact Info

Product

Resources

About