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Condensed Matter > Strongly Correlated Electrons
Title: Coexistence of insulating phases in confined fermionic chains with a Wannier-Stark potential
(Submitted on 30 Sep 2023 (v1), last revised 5 Oct 2023 (this version, v2))
Abstract: We study fermions on a finite chain, interacting repulsively when residing on the same and on nearest-neighbor sites, and subjected to a Wannier-Stark linearly-varying potential. Using the density matrix renormalization-group numerical technique to solve this generalized extended Hubbard model, the ground state exhibits a staircase of (quasi) plateaus in the average local site density along the chain, decreasing from being doubly-filled to empty as the potential increases. These `plateaus' represent locked-in commensurate phases of charge density waves together with band and Mott insulators. These phases are separated by incompressible regions with incommensurate fillings. It is suggested that experimental variations of the slope of the potential and of the range of the repulsive interactions will produce such a coexistence of phases which have been individually expected theoretically and observed experimentally for uniform systems.
Submission history
From: Amnon Aharony [view email][v1] Sat, 30 Sep 2023 07:48:44 GMT (802kb,D)
[v2] Thu, 5 Oct 2023 00:37:06 GMT (802kb,D)
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