  We present a reentrant phase transition in a bridging model between two
different topological models: Kitaev and Haldane chains. This model is
activated by introducing a bond alternation into the Kitaev chain [A. Yu
Kitaev, Phys.-Usp. {\bf 44} 131 (2001)]. Without the bond alternation, finite
pairing potential induces a topological state defined by zero-energy Majorana
edge mode, while finite bond alternation without the pairing potential makes a
different topological state similar to the Haldane state, which is defined by
local Berry phase in the bulk. The topologically-ordered state corresponds to
the Su-Schrieffer-Heeger state, which is classified as the same symmetry class.
We thus find a phase transition between the two topological phases with a
reentrant phenomenon, and extend the phase diagram in the plane of the pairing
potential and the bond alternation by using three techniques: recursive
equation, fidelity, and Pfaffian. In addition, we find that the phase
transition is characterized by both the change of the position of Majorana
zero-energy modes from one edge to the other edge and the emergence of a string
order in the bulk, and that the reentrance is based on a sublattice U(1)
rotation. Consequently, our study and model do not only open a direct way to
discuss the bulk and edge topologies, but demonstrate an example of the
reentrant topologies.
