Superradiant Quantum Materials

Mazza, Giacomo; Georges, Antoine

doi:10.1103/physrevlett.122.017401

Cited by 129 publications

(106 citation statements)

References 75 publications

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“…These include systems with magnetic-dipole interactions due to the presence of cavity magnetic fields [19] or its circuit QED analog with an inductive coupling [20,21] that can be of much larger magnitude [22]. Notably, in the past two decades it has been shown in several works for different physical systems that upon a proper microscopic treatment, the mysterious SQPT assumes a more familiar shape of a ferroelectric [23,24] or an excitonic insulator [25,26] instability. In these studies, the crucial role of the Coulomb interaction has been pointed out.…”

Section: Introductionmentioning

confidence: 99%

Rashba Cavity QED: A Route Towards the Superradiant Quantum Phase Transition

et al. 2019

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We develop a theory of cavity quantum electrodynamics for a 2D electron gas in the presence of Rashba spinorbit coupling and perpendicular static magnetic field, coupled to spatially nonuniform multimode quantum cavity photon fields. We demonstrate that the lowest polaritonic frequency of the full Hamiltonian can vanish for realistic parameters, achieving the Dicke superradiant quantum phase transition. This singular behaviour originates from soft spin-flip transitions possessing a non-vanishing dipole moment at non-zero wave vectors and can be viewed as a magnetostatic instability. arXiv:1907.02938v1 [cond-mat.str-el]

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Section: Introductionmentioning

confidence: 99%

Rashba Cavity QED: A Route Towards the Superradiant Quantum Phase Transition

et al. 2019

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“…In the future, the insertion of local impurity atoms as quantum probes [68][69][70] could allow for the read-out and possibly the controlled manipulation of the localised Majorana modes created in such a setup. Furthermore, with cavity design of materials also being discussed in condensed matter [71][72][73][74][75][76][77][78], ultracold atoms could form the an ideal platform to test these theoretical proposals in well-controlled settings.…”

Section: Magnetic Field B/2tmentioning

confidence: 99%

Cavity-Mediated Unconventional Pairing in Ultracold Fermionic Atoms

Schlawin

Jaksch

2019

Phys. Rev. Lett.

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We investigate long-range pairing interactions between ultracold fermionic atoms confined in an optical lattice which are mediated by the coupling to a cavity. In the absence of other perturbations, we find three degenerate pairing symmetries for a two-dimensional square lattice. By tuning a weak local atomic interaction via a Feshbach resonance or by tuning a weak magnetic field, the superfluid system can be driven from a topologically trivial s-wave to topologically ordered, chiral superfluids containing Majorana edge states. Our work points out a novel path towards the creation of exotic superfluid states by exploiting the competition between long-range and short-range interactions.Ultracold fermionic gases form an ideal platform for a new generation of quantum technologies [1,2], and for the quantum simulation of many-body phenomena [3,4] such as superfluidity [5,6]. Their key feature for these applications is that local (on-site) atomic interactions can be tuned very precisely using Feshbach resonances to explore, e.g, the crossover from BCS to BEC regimes [7], quantum simulation of the Fermi Hubbard model [8], and strongly correlated fermions in reduced dimensions [9][10][11][12]. Coupling ultracold atoms to optical cavities [13][14][15][16][17][18][19][20][21][22] promises to extend this control to longranged interactions.

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“…In ultrafast materials science, intriguing phenomena have been explored, including but not limited to ultrafast switching between different phases of matter [10][11][12], light control of important couplings in solids [13][14][15], and light-induced superconductivity [16,17]. In cavities, spectacular effects have been observed or predicted, such as dramatically enhanced conductivity in polymers [18], cavity-modified materials properties [19][20][21][22], novel spectroscopies using the quantum nature of light [5], or light-controlled chemical reaction pathways [23]. Finally, in optical lattices, periodically driven quantum systems are investigated within the realm of Floquet engineering, in which the driving is used as a tool to generate effective Hamiltonians with tunable interactions [24][25][26][27][28], which has also been demonstrated in purely photonic systems [29].…”

Section: Introductionmentioning

confidence: 99%

Topological Floquet engineering of twisted bilayer graphene

Topp

Jotzu

McIver

et al. 2019

Phys. Rev. Research

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We investigate the topological properties of Floquet-engineered twisted bilayer graphene above the magic angle driven by circularly polarized laser pulses. Employing a full Moiré-unit-cell tightbinding Hamiltonian based on first-principles electronic structure we show that the band topology in the bilayer, at twisting angles above 1.05 • , essentially corresponds to the one of single-layer graphene. However, the ability to open topologically trivial gaps in this system by a bias voltage between the layers enables the full topological phase diagram to be explored, which is not possible in singlelayer graphene. Circularly polarized light induces a transition to a topologically nontrivial Floquet band structure with the Berry curvature of a Chern insulator. Importantly, the twisting allows for tuning electronic energy scales, which implies that the electronic bandwidth can be tailored to match realistic driving frequencies in the ultraviolet or mid-infrared photon-energy regimes. This implies that Moiré superlattices are an ideal playground for combining twistronics, Floquet engineering, and strongly interacting regimes out of thermal equilibrium.

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Superradiant Quantum Materials

Cited by 129 publications

References 75 publications

Rashba Cavity QED: A Route Towards the Superradiant Quantum Phase Transition

Rashba Cavity QED: A Route Towards the Superradiant Quantum Phase Transition

Cavity-Mediated Unconventional Pairing in Ultracold Fermionic Atoms

Topological Floquet engineering of twisted bilayer graphene

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