The existence of many-body mobility edges in closed quantum systems has been the focus of intense debate after the emergence of the description of the many-body localization phenomenon. Here we propose that this issue can be settled in experiments by investigating the time evolution of local degrees of freedom, tailored for specific energies and intial states. An interacting model of spinless fermions with exponentially long-ranged tunneling amplitudes, whose non-interacting version known to display single-particle mobility edges, is used as the starting point upon which nearest-neighbor interactions are included. We verify the manifestation of many-body mobility edges by using numerous probes, suggesting that one cannot explain their appearance as merely being a result of finite-size effects.Introduction.-A broad consensus on the general phenomenology of the many-body localization (MBL) is now mostly achieved [1][2][3]. It represents one of the paradigmatic examples of the novel physics that can arise from the interplay of interactions and quenched disorder in out-of-equilibrium isolated quantum systems. Specifically, it describes a new regime of the quantum matter where an emerging integrability precludes thermalization. Since the seminal paper by Basko et al. [4], it has been the focus of a variety of numerical studies in different quantum models , as well as in experiments of ultracold atoms [26][27][28], trapped ions [29], solid-state spin systems [30] or in superconducting quantum processors [31,32]. Among the more recent developments, beyond the standard scenario of static quenched disorder, studies have shown the manifestation of MBL in periodically driven quantum systems [33][34][35][36] and even in translationally-invariant models [37][38][39][40][41][42][43][44][45][46]. However, a puzzling question of yet heated debate concerns the possible existence of many-body mobility edges (ME), defined as the critical energy separating localized and delocalized states. In non-interacting disordered settings, MEs are obtained in models with more than two dimensions [47] or in some classes of deterministic quasiperiodic systems in 1D [35,[48][49][50][51][52][53].
We study the interplay between the long-and short-range interaction of a one-dimensional optical lattice system of two-component dipolar fermions by using the density matrix renormalization group method. The atomic density profile, pairing-pairing correlation function, and the compressibility are calculated in the ground state, from which we identify the parameter region of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) pairing state, half-metal (HM) state, FFLO-HM state, and the normal polarized state, and thus the phase diagram in the coordinates of the long-and short-range interaction strength. The effect of the long-range dipolar interaction on the FFLO state is discussed in details. We find that the long-range part of the dipole-dipole interaction does not sweep away the FFLO superconducting region that is driven by the short-range interaction in the Hubbard model, and thus the FFLO state survives in the wide parameter space of the long-range interaction, polarization, and filling.
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