A5013291798- Cold Atom Physics and Bose-Einstein Condensates
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Advanced Condensed Matter Physics
- Strong Light-Matter Interactions
- Quantum and electron transport phenomena
- Advanced Thermodynamics and Statistical Mechanics
- Theoretical and Computational Physics
- Quantum many-body systems
- Quantum chaos and dynamical systems
- Crystallography and Radiation Phenomena
- Quantum Information and Cryptography
- Gas Dynamics and Kinetic Theory
- Advanced Materials Characterization Techniques
- Electronic and Structural Properties of Oxides
- Rare-earth and actinide compounds
- Quantum optics and atomic interactions
- Atomic and Subatomic Physics Research
- Multiferroics and related materials
- Topological Materials and Phenomena
- Magnetic properties of thin films
- Black Holes and Theoretical Physics
- Fluid Dynamics and Turbulent Flows
- Magnetic and transport properties of perovskites and related materials
- X-ray Diffraction in Crystallography
Max Planck Institute of Quantum Optics
2021-2024
Munich Center for Quantum Science and Technology
2023
Harvard University
2015-2018
Budapest University of Technology and Economics
2012-2015
Hungarian Academy of Sciences
2015
Freie Universität Berlin
2012
When a mobile hole is moving in an anti-ferromagnet it distorts the surrounding Neel order and forms magnetic polaron. Such interplay between motion anti-ferromagnetism believed to be at heart of high-Tc superconductivity cuprates. We study single described by t-Jz model with Ising interactions spins 2D. This situation can experimentally realized quantum gas microscopes. hopping much larger than couplings spins, we find strong evidence that polarons understood as bound states two partons,...
High-temperature magnetism of kinetic origin emerges when the Fermi-Hubbard model is doped away from half-filling. Magnetic susceptibility measurements and analysis charge-spin-spin correlators demonstrate emergence magnetic correlations as system cooled down.
We propose a scheme to realize the Kondo model with tunable anisotropy using alkaline-earth atoms in an optical lattice. The new feature of our setup is Floquet engineering interactions time-dependent Zeeman shifts, that can be realized either state-dependent Stark shifts or magnetic fields. properties resulting strongly depend on ferromagnetic interactions. In particular, easy-plane couplings give rise singlet formation even though microscopic are all ferromagnetic. discuss both equilibrium...
We analyze the recently measured anomalous transport properties of an ultracold gas through a ballistic constriction [S. Krinner et al., PNAS 201601812 (2016)]. The quantized conductance observed at weak interactions increases several-fold as is made strongly interacting, which cannot be explained by Landauer theory single-channel transport. show that this phenomenon due to multichannel Andreev reflections edges constriction, where interaction and confinement result in superconducting state....
The interplay of quantum correlations and thermal decoherence is key to understanding the fundamental properties many-body systems. Coherence usually easily destroyed by interaction with environment local fluctuations inherent ensembles. Hence experimental demonstrations rely on cooling system close its ground state or pumping it into a well-defined state. Here, authors instead show how can arise in opposite limit an infinite temperature. Motivated recent experiments ultracold atoms optical...
Traditionally one and two-point correlation functions are used to characterize many-body systems. In strongly correlated quantum materials, such as the doped 2D Fermi-Hubbard system, these may no longer be sufficient because higher-order correlations crucial understanding character of system can numerically dominant. Experimentally, have recently become accessible in ultracold atom Here we reveal strong non-Gaussian anti-ferromagnets show that higher order dominate over lower-order terms. We...
We analyze within quasiparticle theory a recent resonant inelastic x-ray scattering (RIXS) experiment on ${\text{YBa}}_{2}{\text{Cu}}_{3}{\text{O}}_{6+x}$ with the incoming photon energy detuned at several values from resonance maximum [Minola et al., Phys. Rev. Lett. 114, 217003 (2015)]. Surprisingly, data show much weaker dependence detuning than expected measurements different cuprate superconductor, ${\text{Bi}}_{2}{\text{Sr}}_{2}{\text{CuO}}_{6+x}$ [Guarise Nat. Commun. 5, 5760 (2014)]....
The Boltzmann equation is a powerful theoretical tool for modeling the collective dynamics of quantum many-body systems subject to external perturbations. Analysis gives access linear response properties including modes and transport coefficients, but often proves intractable due computational costs associated with multidimensional integrals describing collision processes. Here, we present method resolve this bottleneck, enabling study broad class that appear in fundamental science contexts...
We investigate a three component fermion mixture in the presence of weak attractive interactions. use combination equation motion and Gaussian variational mean-field approaches, which both allow for simultaneous superfluid magnetic ordering an unbiased way, capture interplay between two order parameters. This significantly modifies phase diagram, especially superfluid-normal boundaries. In close vicinity critical temperature small chemical potential imbalances, strong particle-hole symmetry...
We study theoretically the interaction between two species of ultracold atoms confined into layers a finite separation, and demonstrate existence new types confinement-induced interlayer bound quasi-bound molecules: these novel exciton-like molecules appear for both positive negative scattering lengths, exist even layer separations many times larger than interspecies length. The lifetime grows exponentially with increasing they can therefore be observed in simple shaking experiments, as we...
We study kinetic magnetism for the Fermi-Hubbard models in triangular type lattices, including a zigzag ladder, four- and six-legged cylinders full two-dimensional lattice. focus on regime of strong interactions, $U\gg t$ filling factors around one electron per site. For temperatures well above hopping strength, Curie-Weiss form magnetic susceptibility suggests effective antiferromagnetic correlations systems that are hole doped with respect to $\nu=1$, ferromagnetic dopings. show these...
Topological excitations keep fascinating physicists since many decades. While individual vortices and solitons emerge have been observed in areas of physics, their most intriguing higher dimensional topological relatives, skyrmions (smooth, topologically stable textures) magnetic monopoles -- emerging almost necessarily any grand unified theory responsible for charge quantization remained mostly elusive. Here we propose that loading a three-component nematic superfluid such as $^{23}$Na into...
The Boltzmann equation is a powerful theoretical tool for modeling the collective dynamics of quantum many-body systems subject to external perturbations. Analysis gives access linear response properties including modes and transport coefficients, but often proves intractable due computational costs associated with multidimensional integrals describing collision processes. Here, we present method resolve this bottleneck, enabling study broad class that appear in fundamental science contexts...