Quantum scale anomaly and spatial coherence in a 2D Fermi superfluid
arXiv:1805.04734 · doi:10.1126/science.aau4402
Abstract
Quantum anomalies are violations of classical scaling symmetries caused by quantum fluctuations. Although they appear prominently in quantum field theory to regularize divergent physical quantities, their influence on experimental observables is difficult to discern. Here, we discovered a striking manifestation of a quantum anomaly in the momentum-space dynamics of a 2D Fermi superfluid of ultracold atoms. We measured the position and pair momentum distribution of the superfluid during a breathing mode cycle for different interaction strengths across the BEC-BCS crossover. Whereas the system exhibits self-similar evolution in the weakly interacting BEC and BCS limits, we found a violation in the strongly interacting regime. The signature of scale-invariance breaking is enhanced in the first-order coherence function. In particular, the power-law exponents that characterize long-range phase correlations in the system are modified due to this effect, indicating that the quantum anomaly has a significant influence on the critical properties of 2D superfluids.
arXiv comment9 pages, 5 figures
References in corpus (33)
- Magic-angle graphene superlattices: a new platform for unconventional superconductivity
- Berezinskii-Kosterlitz-Thouless Crossover in a Trapped Atomic Gas
- Bose-Einstein condensation in quasi2D trapped gases
- Interatomic collisions in a tightly confined Bose gas
- Observation of scale invariance and universality in two-dimensional Bose gases
- Breathing Modes and Hidden Symmetry of Trapped Atoms in 2D
- Observation of the Berezinskii-Kosterlitz-Thouless Phase Transition in an Ultracold Fermi Gas
- Observation of pair condensation in the quasi-2D BEC-BCS crossover
- BCS-BEC crossover in a two-dimensional Fermi gas
- Scale invariance and viscosity of a two-dimensional Fermi gas
- Ground-state pressure of quasi-2D Fermi and Bose gases
- Observation of the Presuperfluid Regime in a Two-Dimensional Bose Gas
- Equation of State of Ultracold Fermions in the 2D BEC-BCS Crossover Region
- An Example of Quantum Anomaly in the Physics of Ultra-Cold Gases
- Quantum anomaly, universal relations, and breathing mode of a two-dimensional Fermi gas
- Thermodynamics of an attractive 2D Fermi gas
- Exact Numerical Results on the Ground State of Strongly Interacting Fermi Gases in Two Dimensions
- Quench-induced breathing mode of one-dimensional Bose gases
- Anomalous breaking of scale invariance in a two-dimensional Fermi gas
- Apparent low-energy scale invariance in two-dimensional Fermi gases
- Matter wave Fourier optics with a strongly interacting two-dimensional Fermi gas
- Quantum anomaly and 2D-3D crossover in strongly interacting Fermi gases
- High temperature pairing in a strongly interacting two-dimensional Fermi gas
- Quantum scale anomaly and spatial coherence in a 2D Fermi superfluid
- Fit-free determination of scale invariant equations of state: application to the 2D Bose gas across the Berezinksii-Kosterlitz-Thouless transition
- Bulk viscosity and contact correlations in attractive Fermi gases
- Breathing mode of two-dimensional atomic Fermi gases in harmonic traps
- Observing a scale anomaly and a universal quantum phase transition in graphene
- Criteria for 2D kinematics in an interacting Fermi gas
- Collective many-body bounce in the breathing-mode oscillations of a Tonks-Girardeau gas
- On a scale-invariant Fermi gas in a time-dependent harmonic potential
- Virial expansion for the Tan contact and Beth-Uhlenbeck formula from 2D SO(2,1) anomalies
- Quasi-long-range order in trapped two-dimensional Bose gases
Cited by in corpus (37)
- QCD thermalization: Ab initio approaches and interdisciplinary connections
- Sound propagation and quantum limited damping in a two-dimensional Fermi gas
- Quantum scale anomaly and spatial coherence in a 2D Fermi superfluid
- Extracting the field theory description of a quantum many-body system from experimental data
- Bulk viscosity and contact correlations in attractive Fermi gases
- Few-body correlations in two-dimensional Bose and Fermi ultracold mixtures
- Cooper Triples in Attractive Three-Component Fermions: Implication for Hadron-Quark Crossover
- Quantum critical thermal transport in the unitary Fermi gas
- Analytical treatment of the interaction quench dynamics of two bosons in a two-dimensional harmonic trap
- Collective modes of ultracold fermionic alkaline-earth gases with SU(N) symmetry
- Few-body perspective of a quantum anomaly in two-dimensional Fermi gases
- Virial Expansion for a Three-Component Fermi Gas in One Dimension: The Quantum Anomaly Correspondence
- Effective theory for ultracold strongly interacting fermionic atoms in two dimensions
- Experimental setup for studying an ultracold mixture of trapped Yb-Li
- Equation of State of Neutron-Rich Matter in -Dimensions
- Dynamics of strongly interacting Fermi gases with time-dependent interactions: Consequence of conformal symmetry
- Quantum adiabatic cycles and their breakdown
- Pseudogap regime of a strongly interacting two-dimensional Fermi gas with and without confinement-induced effect range of interactions
- Finite Temperature Off-Diagonal Long-Range Order for Interacting Bosons
- Oscillatory-like Expansion of a Fermionic Superfluid
- Residual bulk viscosity of a disordered 2D electron gas
- Complex scaling flows in the quench dynamics of interacting particles
- Dynamical excitation processes and correlations of three-body two-dimensional mixtures
- Non-relativistic trace anomaly and equation of state in dense fermionic matter
- Quantum droplets in two-dimensional Bose mixtures at finite temperature
- Dimensional crossover in ultracold Fermi gases from Functional Renormalisation
- Bulk viscosity of resonantly interacting fermions in the quantum virial expansion
- Nucleon Short-Range Correlations and High-Momentum Dynamics: Implications on the Equation of State of Dense Matter
- Emergent Infrared Conformal Dynamics in Strongly Interacting Quantum Gases
- Particle and pair spectra for strongly correlated Fermi gases: A real-frequency solver
- Observing Spatial Charge and Spin Correlations in a Strongly-Interacting Fermi Gas
- Universal Properties of Anisotropic Dipolar Bosons in Two Dimensions
- Fall-to-the-centre as a symmetry breaking transition
- Hydrodynamic attractor in periodically driven ultracold quantum gases
- Dynamics of large samples of repulsive Fermi gases at nonzero temperatures
- Echoes and defects in the Calogero model
- Efficient shortcuts-to-adiabaticity for loading an ultracold Fermi gas into higher orbital bands of one-dimensional optical lattice