Effective Hamiltonian with tunable mixed pairing in driven optical lattices

Abstract

Mixed pairing in ultracold Fermi gases can give rise to interesting many-body phases, such as topological nontrivial superfluids that support Majorana zero modes (MZMs) with various spatial configurations. Unfortunately, in ordinary lattice systems, the topological phase and the associated MZMs are suppressed by the dominant $s$-wave pairing. Here we present a proposal for engineering effective Hamiltonians with tunable mixed on- and off-site pairing based on driven optical lattices. The on- and off-site pairing can be changed independently by means of a periodical driving field rather than magnetic Feshbach resonances. It paves the way for suppressing the dominant on-site interaction that frustrates the emergence of topological superfluids and for synthesizing MZMs localized in edges or corners.

8 pages, 5 figures

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Cited by in corpus (5)

• Sublattice-enriched tunability of bound states in second-order topological insulators and superconductors
• Synthetic non-Abelian topological charges in ultracold atomic gases
• Tunable boson-assisted finite-range interaction and engineering Majorana corner modes in optical lattices
• Multiorder topological superfluid phase transitions in a two-dimensional optical superlattice
• Majorana corner states in an attractive quantum spin Hall insulator with opposite in-plane Zeeman energy at two sublattice sites