Journal
PHYSICAL REVIEW B
Volume 101, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.101.174505
Keywords
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Funding
- German Research Foundation [1929 GiRyd]
- European Commission (ITN ColOpt)
- German Ministry of Education and Research (BMBF) via the QuantERA project NAQUAS
- German Ministry of Education and Research (BMBF) via the QuantERA project QTFLAG
- QuantERA ERA-NET Cofund in Quantum Technologies within the European Union's Horizon 2020 program
- National Science Centre (Poland) [2017/25/Z/ST2/03029]
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We determine the quantum ground state of dipolar bosons in a quasi-one-dimensional optical lattice and interacting via s-wave scattering. The Hamiltonian is an extended Bose-Hubbard model which includes hopping terms due to the interactions. We identify the parameter regime for which the coefficients of the interaction-induced hopping terms become negative. For these parameters we numerically determine the phase diagram for a canonical ensemble and by means of density matrix renormalization group. We show that at sufficiently large values of the dipolar strength there is a quantum interference between the tunneling due to single-particle effects and the one due to the interactions. Because of this phenomenon, incompressible phases appear at relatively large values of the single-particle tunneling rates. This quantum interference cuts the phase diagram into two different, disconnected superfluid phases. In particular, at vanishing kinetic energy, the phase is always superfluid with a staggered superfluid order parameter. These dynamics emerge from quantum interference phenomena between quantum fluctuations and interactions and shed light into their role in determining the thermodynamic properties of quantum matter.
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