A5046114800- Cold Atom Physics and Bose-Einstein Condensates
- Strong Light-Matter Interactions
- Physics of Superconductivity and Magnetism
- Quantum, superfluid, helium dynamics
- Atomic and Subatomic Physics Research
- Mechanical and Optical Resonators
- Quantum many-body systems
- Quantum and electron transport phenomena
- Perovskite Materials and Applications
- Advanced Thermodynamics and Statistical Mechanics
- Spectroscopy and Laser Applications
- Quantum Information and Cryptography
- Photonic and Optical Devices
- Topological Materials and Phenomena
Max Planck Institute of Quantum Optics
2020-2024
Munich Center for Quantum Science and Technology
2020-2024
Center for Astrophysics Harvard & Smithsonian
2024
Harvard University
2024
Understanding the behavior of an impurity strongly interacting with a Fermi sea is long-standing challenge in many-body physics. When interactions are short ranged, two vastly different ground states exist: polaron quasiparticle and molecule dressed by majority atoms. In single-impurity limit, it predicted that at critical interaction strength, first-order transition occurs between these states. Experiments, however, always conducted finite temperature density regime. The fate...
The physics of long-range interacting quantum systems is currently living through a renaissance driven by the fast progress in simulators. In these many paradigms statistical do not apply and also universal long-wavelength gets substantially modified presence long-ranged forces. Here we explore low-energy excitations several systems, including spin models Bose gases, ordered phase associated with spontaneous breaking U(1) SU(2) symmetries. Instead expected Goldstone modes, find three...
The interaction between a mobile quantum impurity and bosonic bath leads to the formation of quasiparticles, termed Bose polarons. elementary properties polarons, such as their mutual interactions, can differ drastically from those bare impurities. Here, we explore polaron physics in two-dimensional nonequilibrium setting by injecting σ− polarized exciton-polariton impurities into coherent σ+ polaritons generated resonant laser excitation monolayer MoSe2 embedded an optical cavity. By...
Characterizing the low-energy dynamics of quantum materials is crucial to our understanding strongly correlated electronic states. However, extracting universal dynamical features requires resolving correlations at both low energy and momentum. Here, we introduce nitrogen-vacancy (NV) centers in diamond as a novel powerful sensing platform superconducting materials. We demonstrate strengths approach by probing several phenomena high-$T_c$ cuprate Bi$_2$Sr$_2$CaCu$_2$O$_{8+\delta}$ (BSCCO) --...
An impurity interacting with an ultracold Fermi gas can form either a polaron state or dressed molecular state, the molaron, in which forms bound one particle. This molaron features rich physics, including negative effective mass around unitarity and first-order transition to state. However, these have remained so far experimentally inaccessible. In this work we show theoretically how be directly prepared even its excited states using Raman spectroscopy techniques. Initializing system...
In bosonic gases at thermal equilibrium, an external quadratic drive can induce a Bose-Einstein condensation described by the Ising transition, as consequence of explicitly broken U(1) phase rotation symmetry down to Z_{2}. However, in physical realizations such exciton polaritons and nonlinear photonic lattices, equilibrium is lost state rather determined balance between losses drive. A fundamental question then how nonequilibrium fluctuations affect this transition. Here, we show that...
This work explores the possibility of creating and controlling unconventional nonlinearities by periodic driving, in a broad class systems described nonlinear Schrödinger equation (NLSE). By means parent quantum many-body description, we demonstrate that such driven are well captured an effective NLSE with emergent nonlinearities, which can be finely controlled tuning driving sequence. We first consider general two-mode systems—relevant to optical Kerr cavities, waveguides, Bose-Einstein...
An impurity interacting with an ultracold Fermi gas can form either a polaron state or dressed molecular in which the forms bound one particle. This features rich physics, including first-order transition to and negative effective mass at small interactions. However, these have remained so far experimentally inaccessible. In this work we show theoretically how be directly prepared even its excited using state-of-the-art cold atom Raman spectroscopy techniques. Initializing system...
The physics of long-range interacting quantum systems is currently living through a renaissance driven by the fast progress in simulators. In these many paradigms statistical do not apply and also universal long-wavelength gets substantially modified presence long-ranged forces. Here we explore low-energy excitations several systems, including spin models Bose gases, ordered phase associated with spontaneous breaking U(1) SU(2) symmetries. Instead expected Goldstone modes, find three...
Immersing a mobile impurity in quantum many-body environment can reveal fundamental properties of the background medium, hence providing powerful probe matter. This approach is particularly intriguing when considering media with exotic properties, such as strongly-correlated phases and topological states In this work, we study dressing interacting chiral mode, provided by edge The resulting ''chiral polaron'' characterized an asymmetric spectral function, which reflects chirality group...
The interaction between a mobile quantum impurity and bosonic bath leads to the formation of quasiparticles, termed Bose polarons. elementary properties polarons, such as their mutual interactions, can differ drastically from those bare impurities. Here, we explore polaron physics in two-dimensional nonequilibrium setting by injecting $\sigma^-$ polarised exciton-polariton impurities into coherent $\sigma^+$ polaritons generated resonant laser excitation monolayer MoSe$_2$ embedded an...
This work explores the possibility of creating and controlling unconventional nonlinearities by periodic driving, in a broad class systems described nonlinear Schrödinger equation (NLSE). By means parent quantum many-body description, we demonstrate that such driven are well captured an effective NLSE with emergent nonlinearities, which can be finely controlled tuning driving sequence. We first consider general two-mode - relevant to optical Kerr cavities, waveguides Bose-Einstein...