Abstract
An elusive goal in the field of driven quantum matter is the induction of long-range order. Here, we propose a mechanism based on light-induced evaporative cooling of holes in a correlated fermionic system. Since the entropy of a filled narrow band grows rapidly with hole doping, the isentropic transfer of holes from a doped Mott insulator to such a band results in a drop of temperature. Strongly correlated Fermi liquids and symmetry-broken states could thus be produced by dipolar excitations. Using nonequilibrium dynamical mean field theory, we show that suitably designed chirped pulses may realize this cooling effect. In particular, we demonstrate the emergence of antiferromagnetic order in a system which is initially in a weakly correlated state above the maximum Néel temperature. Our work suggests a general strategy for inducing strong correlation phenomena in periodically modulated atomic gases in optical lattices or light-driven materials.
Highlights
An elusive goal in the field of driven quantum matter is the induction of long-range order
While an enhancement of pairing susceptibilities in photo-doped Mott insulators has been reported[21], the observed effect was too small to trigger a symmetry-breaking. It remained unclear if quasi-particle cooling and symmetry-broken phases can be induced by periodic driving or photo-doping if heating and thermalization effects are accounted for
The entropy of the system can be reduced by this mechanism down to a temperature which is essentially limited by the width of the narrow band
Summary
An elusive goal in the field of driven quantum matter is the induction of long-range order. In an earlier study focusing on bi-layer cuprates[1], the authors showed that a time-periodic modulation of the plasma frequency may result in the cooling of the low-energy inter-bi-layer plasmon modes by energy transfer to the high-energy intra-bi-layer plasmon modes While these proposals are very interesting, they rely so far on relatively simple model calculations which may not fully capture the interaction effects in driven many-body systems. While an enhancement of pairing susceptibilities in photo-doped Mott insulators has been reported[21], the observed effect was too small to trigger a symmetry-breaking It remained unclear if quasi-particle cooling and symmetry-broken phases can be induced by periodic driving or photo-doping if heating and thermalization effects are accounted for. Using nonequilibrium DMFT simulations, we show that this idealized scenario can be approximately realized by simple and realistic driving protocols, resulting in optically induced cooling and long-range order
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