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Reentrant phase behavior in systems with density-induced tunneling.
Sci Rep
May 2024
Institute of Spintronics and Quantum Information, Faculty of Physics, Adam Mickiewicz Univeristy in Poznań, Poznań, Poland.
We show that correlations in strongly interacting many-particle systems can create quantum decoherence, leading to a mechanism of dissipation that does not rely on an external source. Using analytical methods, we study a bosonic many body system in two dimensions, with extended interactions between particles. We show that, as expected, the system can be driven out of a coherent state.
View Article and Find Full Text PDFHomotopy Phases of FQHE with Long-Range Quantum Entanglement in Monolayer and Bilayer Hall Systems.
Nanomaterials (Basel)
June 2020
Department of Quantum Technologies, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, 50-370 Wrocław, Poland.
Correlated phases in Hall systems have topological character. Multilayer configurations of planar electron systems create the opportunity to change topological phases on demand using macroscopic factors, such as vertical voltage. We present an analysis of such phenomena in close relation to recent experiments with multilayer Hall setups including GaAs and graphene multi-layers.
View Article and Find Full Text PDFTheory of Non-Hermitian Fermionic Superfluidity with a Complex-Valued Interaction.
Phys Rev Lett
September 2019
Department of Physics, Kyoto University, Kyoto 606-8502, Japan.
Motivated by recent experimental advances in ultracold atoms, we analyze a non-Hermitian (NH) BCS Hamiltonian with a complex-valued interaction arising from inelastic scattering between fermions. We develop a mean-field theory to obtain a NH gap equation for order parameters, which are different from the standard BCS ones due to the inequivalence of left and right eigenstates in the NH physics. We find unconventional phase transitions unique to NH systems: superfluidity shows reentrant behavior with increasing dissipation, as a consequence of nondiagonalizable exceptional points, lines, and surfaces in the quasiparticle Hamiltonian for weak attractive interactions.
View Article and Find Full Text PDFSupersolid phase accompanied by a quantum critical point in the intermediate coupling regime of the Holstein model.
Phys Rev Lett
December 2014
Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan.
We reveal that electron-phonon systems described by the Holstein model on a bipartite lattice exhibit, away from half filling, a supersolid (SS) phase characterized by coexisting charge order (CO) and superconductivity (SC), and an accompanying quantum critical point (QCP). The SS phase, demonstrated by the dynamical mean-field theory with a quantum Monte Carlo impurity solver, emerges in the intermediate-coupling regime, where the peak of the Tc dome is located and the metal-insulator crossover occurs. On the other hand, in the weak- and strong-coupling regimes the CO-SC boundary is of first order with no intervening SS phases.
View Article and Find Full Text PDFReentrant BCS-BEC crossover and a superfluid-insulator transition in optical lattices.
Phys Rev Lett
December 2012
Department of Physics, University of Colorado, Boulder, Colorado 80309, USA.
We study the thermodynamics of a two-species Feshbach-resonant atomic Fermi gas in a periodic potential, focusing in a deep optical potential where a tight binding model is applicable. We show that for a more than half-filled band the gas exhibits a reentrant crossover with decreased detuning (increased attractive interaction), from a paired BCS superfluid to a Bose-Einstein condensate (BEC) of molecules of holes, back to the BCS superfluid, and finally to a conventional BEC of diatomic molecules. This behavior is associated with the nonmonotonic dependence of the chemical potential on detuning and the concomitant Cooper-pair or molecular size, larger in the BCS and smaller in the BEC regimes.
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