In the 1D Fermi-Hubbard model with opposing spin-dependent linear potentials, the ground state shows three regimes with a staircase-like reduction in bound pairs as the gradient increases, enabling integer-level control of pairing.
(15) gives 2βc2 N 2 − L+ 1 2 ≈ − p U 2 + 16,(18) which yields βc2L≈ √ U 2 + 16 1−n+ 1 L .(19) 11 0 0.01 0.02 0.03 0.04 0 1 2 3 4 5 6 7 (a) N = 45 + 45 DMRG model, an
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Ground state of the Hubbard model with spin-dependent linear potential
In the 1D Fermi-Hubbard model with opposing spin-dependent linear potentials, the ground state shows three regimes with a staircase-like reduction in bound pairs as the gradient increases, enabling integer-level control of pairing.