



@article {2762,
	title = {Frustration-induced anomalous transport and strong photon decay in waveguide QED},
	journal = {Phys. Rev. Research},
	volume = {3},
	year = {2021},
	month = {9/16/2021},
	abstract = {<p>We study the propagation of photons in a one-dimensional environment consisting of two non-interacting species of photons frustratingly coupled to a single spin-1/2. The ultrastrong frustrated coupling leads to an extreme mixing of the light and matter degrees of freedom, resulting in the disintegration of the spin and a breakdown of the \&quot;dressed-spin\&quot;, or polaron, description. Using a combination of numerical and analytical methods, we show that the elastic response becomes increasingly weak at the effective spin frequency, showing instead an increasingly strong and broadband response at higher energies. We also show that the photons can decay into multiple photons of smaller energies. The total probability of these inelastic processes can be as large as the total elastic scattering rate, or half of the total scattering rate, which is as large as it can be. The frustrated spin induces strong anisotropic photon-photon interactions that are dominated by inter-species interactions. Our results are relevant to state-of-the-art circuit and cavity quantum electrodynamics experiments.</p>},
	doi = {https://doi.org/10.1103/PhysRevResearch.3.L032058},
	url = {https://arxiv.org/abs/2007.03690},
	author = {Ron Belyansky and Seth Whitsitt and Rex Lundgren and Yidan Wang and Andrei Vrajitoarea and Andrew A. Houck and Alexey V. Gorshkov}
}
@article {2256,
	title = {Fractional quantum Hall phases of bosons with tunable interactions: From the Laughlin liquid to a fractional Wigner crystal},
	year = {2018},
	abstract = {<p>Highly tunable platforms for realizing topological phases of matter are emerging from atomic and photonic systems, and offer the prospect of designing interactions between particles. The shape of the potential, besides playing an important role in the competition between different fractional quantum Hall phases, can also trigger the transition to symmetry-broken phases, or even to phases where topological and symmetry-breaking order coexist. Here, we explore the phase diagram of an interacting bosonic model in the lowest Landau level at half-filling as two-body interactions are tuned. Apart from the well-known Laughlin liquid, Wigner crystal phase, stripe, and bubble phases, we also find evidence of a phase that exhibits crystalline order at fractional filling per crystal site. The Laughlin liquid transits into this phase when pairs of bosons strongly repel each other at relative angular momentum 4ℏ. We show that such interactions can be achieved by dressing ground-state cold atoms with multiple different-parity Rydberg states.</p>},
	url = {https://arxiv.org/abs/1809.04493},
	author = {Tobias Gra{\ss} and Przemyslaw Bienias and Michael Gullans and Rex Lundgren and Joseph Maciejko and Alexey V. Gorshkov}
}
