M. Di Liberto

Université libre de Bruxelles

Hubbard modelUltracold atomPhysicsTopological insulatorLattice (order)Phase transitionQuantum dynamicsQuantum Monte CarloQuantum simulatorBound stateBoundary value problemCharge (physics)SuperfluidityCondensed matter physicsPopulationBose–Einstein condensateFeshbach resonanceQuantum mechanicsGround stateDegenerate energy levelsBosonSpin-½Optical lattice

15Publications

8H-index

208Citations

Publications 12

Newest

#1M. Di Liberto (ULB: Université libre de Bruxelles)H-Index: 8

#2Nathan Goldman (ULB: Université libre de Bruxelles)H-Index: 44

Last. Giandomenico Palumbo (ULB: Université libre de Bruxelles)H-Index: 8

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Bloch oscillations (BOs) are a fundamental phenomenon by which a wave packet undergoes a periodic motion in a lattice when subjected to a force. Observed in a wide range of synthetic systems, BOs are intrinsically related to geometric and topological properties of the underlying band structure. This has established BOs as a prominent tool for the detection of Berry-phase effects, including those described by non-Abelian gauge fields. In this work, we unveil a unique topological effect that manif...

Interaction-induced lattices for bound states: Designing flat bands, quantized pumps, and higher-order topological insulators for doublons

#1Grazia SalernoH-Index: 10

#2Giandomenico PalumboH-Index: 8

Last. M. Di LibertoH-Index: 8

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#1M. Di Liberto (University of Trento)H-Index: 8

#2Alessio Recati (University of Trento)H-Index: 31

Last. C. MenottiH-Index: 18

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We study the low-energy excitations of the Bose-Hubbard model in the strongly interacting superfluid phase using a Gutzwiller approach. We extract the single-particle and single-hole excitation amplitudes for each mode and report emergent mode-dependent particle-hole symmetry on specific arc-shaped lines in the phase diagram connecting the well-known Lorentz-invariant limits of the Bose-Hubbard model. By tracking the in-phase particle-hole symmetric oscillations of the order parameter, we provid...

#1R. H. ChaviguriH-Index: 1

#2Tommaso ComparinH-Index: 6

Last. M. A. CaracanhasH-Index: 12

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Both mixtures of atomic Bose-Einstein condensates and systems with atoms trapped in optical lattices have been intensely explored theoretically, mainly due to the exceptional developments on the experimental side. We investigate the properties of ultracold atomic impurities (bosons) immersed in a vortex lattice of a second Bose-condensed species. In contrast to the static optical-lattice configuration, the vortex lattice presents intrinsic dynamics given by its Tkachenko modes. These excitations...

#1Maxim A. GorlachH-Index: 13

#2M. Di LibertoH-Index: 8

Last. C. MenottiH-Index: 18

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#1M. Di Liberto (University of Trento)H-Index: 8

#2Alessio Recati (LMU: Ludwig Maximilian University of Munich)H-Index: 31

Last. C. Menotti (University of Trento)H-Index: 18

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We study the bosonic two-body problem in a Su-Schrieffer-Heeger dimerized chain with on-site and nearest-neighbor interactions. We find two classes of bound states. The first, similar to the one induced by on-site interactions, has its center of mass on the strong link, whereas the second, existing only thanks to nearest-neighbor interactions, is centered on the weak link. We identify energy crossings between these states and analyse them using exact diagonalization and perturbation theory. In t...

#1M. Di Liberto (University of Trento)H-Index: 8

#2Alessio Recati (LMU: Ludwig Maximilian University of Munich)H-Index: 31

Last. C. Menotti (University of Trento)H-Index: 18

view all 4 authors...

We consider two interacting bosons in a dimerized Su-Schrieffer-Heeger (SSH) lattice. We identify a rich variety of two-body states. In particular, for open boundary conditions and moderate interactions, edge bound states (EBS) are present even for the dimerization that does not sustain single-particle edge states. Moreover, for large values of the interactions, we find a breaking of the standard bulk-boundary correspondence. Based on the mapping of two interacting particles in one dimension ont...

#1M. Di Liberto (University of Trento)H-Index: 8

#2Andreas Hemmerich (Zhejiang University of Technology)H-Index: 36

Last. C. Morais Smith (Zhejiang University of Technology)H-Index: 30

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Topological states of matter are peculiar quantum phases showing different edge and bulk transport properties connected by the bulk-boundary correspondence. While non-interacting fermionic topological insulators are well established by now and have been classified according to a ten-fold scheme, the possible realisation of topological states for bosons has not been much explored yet. Furthermore, the role of interactions is far from being understood. Here, we show that a topological state of mat...

#1M. Di Liberto (UU: Utrecht University)H-Index: 8

#2Tommaso Comparin ('ENS Paris': École Normale Supérieure)H-Index: 6

Last. C. Morais Smith (UU: Utrecht University)H-Index: 30

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The control of transport properties is a key tool at the basis of many technologically relevant effects in condensed matter. The clean and precisely controlled environment of ultracold atoms in optical lattices allows one to prepare simplified but instructive models, which can help to better understand the underlying physical mechanisms. Here we show that by tuning a structural deformation of the unit cell in a bipartite optical lattice, one can induce a phase transition from a superfluid into v...

Ultracold fermions in a one-dimensional bipartite optical lattice: Metal-insulator transitions driven by shaking

#1M. Di Liberto (UU: Utrecht University)H-Index: 8

#2Daniele Malpetti (UNIPV: University of Pavia)H-Index: 3

Last. C. Morais Smith (UU: Utrecht University)H-Index: 30

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We theoretically investigate the behavior of a system of fermionic atoms loaded in a bipartite one-dimensional optical lattice that is under the action of an external time-periodic driving force. By using Floquet theory, an effective model is derived. The bare hopping coefficients are renormalized by zeroth-order Bessel functions of the first kind with different arguments for the nearest-neighbor and next-nearest-neighbor hopping. The insulating behavior characterizing the system at half filling...

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