Thomas Bilitewski
Max Planck Society
Quantum spin liquidButterfly effectEnergy landscapePhysicsStar formationLattice (order)AntiferromagnetismAngular momentumHamiltonian (quantum mechanics)AmplitudeMaxima and minimaFermi Gamma-ray Space TelescopeScatteringLyapunov exponentFlatteningSuperfluidityFermi energyCondensed matter physicsInflowPopulationMany bodyQuantum electrodynamicsMoleculeSpin statesFrustrationGauge (firearms)Symmetry (physics)Fermi liquid theoryFermionSpin (physics)Floquet theoryQuantum mechanicsDegenerate energy levelsSpin-½QuantumFermi gasPhase diagramCoulombOptical latticeMetallicity
Publications 27
#1Mikhail MamaevH-Index: 5
#2Peiru HeH-Index: 4
Last. Ana Maria ReyH-Index: 62
view all 6 authors...
We introduce a protocol to observe p-wave interactions in ultracold fermionic atoms loaded in a three-dimensional optical lattice. Our scheme uses specific motionally excited band states to form an orbital subspace immune to band relaxation. A laser dressing is applied to reduce the differential kinetic energy of the orbital states and make their dispersion highly isotropic. When combined with a moderate increase of the scattering volume by a Feshbach resonance, the effect of p-wave interactions...
The search for departures from standard hydrodynamics in many-body systems has yielded a number of promising leads, especially in low dimension. Here we study one of the simplest classical interacting lattice models, the nearest-neighbour Heisenberg chain, with temperature as tuning parameter. Our numerics expose strikingly different spin dynamics between the antiferromagnet, where it is largely diffusive, and the ferromagnet, where we observe strong evidence either of spin super-diffusion or an...
#1Thomas BilitewskiH-Index: 8
Last. Ana Maria Rey (NIST: National Institute of Standards and Technology)H-Index: 62
view all 9 authors...
The observation of Pauli blocking of atomic spontaneous decay via direct measurements of the atomic population requires the use of long-lived atomic gases where quantum statistics, atom recoil and cooperative radiative processes are all relevant. We develop a theoretical framework capable of simultaneously accounting for all these effects in a regime where prior theoretical approaches based on semi-classical non-interacting or interacting frozen atom approximations fail. We apply it to atoms in ...
We study correlations, transport and chaos in a Heisenberg magnet as a classical model many-body system. By varying temperature and dimensionality, we can tune between settings with and without symmetry breaking and accompanying collective modes or quasiparticles. We analyse both conventional and out-of-time-ordered spin correlators (`decorrelators') to track the spreading of a spatiotemporally localised perturbation -- the wingbeat of the butterfly -- as well as transport coefficients and Lyapu...
#1Thomas BilitewskiH-Index: 8
#2Luigi De MarcoH-Index: 15
Last. Ana Maria ReyH-Index: 62
view all 8 authors...
We study a bulk fermionic dipolar molecular gas in the quantum degenerate regime confined in a two-dimensional geometry. Using two rotational states of the molecules, we encode a spin 1/2 degree of freedom. To describe the many-body spin dynamics of the molecules, we derive a long-range interacting XXZ model valid in the regime where motional degrees of freedom are frozen. Because of the spatially extended nature of the harmonic oscillator modes, the interactions in the spin model are very long ...
#5A. P R Smith (University of Nottingham)H-Index: 28
Inspired by recent developments in the study of chaos in many-body systems, we construct a measure of local information spreading for a stochastic Cellular Automaton in the form of a spatiotemporally resolved Hamming distance. This decorrelator is a classical version of an Out-of-Time-Order Correlator studied in the context of quantum many-body systems. Focusing on the one-dimensional Kauffman Cellular Automaton, we extract the scaling form of our decorrelator with an associated butterfly veloci...
#1Peiru He (CU: University of Colorado Boulder)
#2Thomas BilitewskiH-Index: 8
Last. Ana Maria ReyH-Index: 62
view all 4 authors...
A recent experiment reported for the first time the preparation of a Fermi degenerate gas of polar molecules and observed a suppression of their chemical reaction rate compared to the one expected from a purely classical treatment. While it was hypothesized that the suppression in the ultracold regime had its roots in the Fermi statistics of the molecules, this argument is inconsistent with the fact that the Fermi pressure should set a lower bound for the chemical reaction rate. Therefore it can...
#1Lindsay Sonderhouse (CU: University of Colorado Boulder)H-Index: 12
#2Christian Sanner (CU: University of Colorado Boulder)H-Index: 19
Last. Jun Ye (CU: University of Colorado Boulder)H-Index: 126
view all 9 authors...
Many-body quantum systems can exhibit a striking degree of symmetry unparallelled in their classical counterparts. In real materials SU(N) symmetry is an idealization, but this symmetry is pristinely realized in fully controllable ultracold alkaline-earth atomic gases. Here, we study an SU(N)-symmetric Fermi liquid of 87Sr atoms, where N can be tuned to be as large as 10. In the deeply degenerate regime, we show through precise measurements of density fluctuations and expansion dynamics that the...
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