Phase transition in the one-dimensional pair-hopping model with unusual one-electron hopping |
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| Institution: | 1. School of Physical Science and Technology, Xinjiang University, Urumqi 830046, China;2. Center for Theoretical Physics, Xinjiang University, Urumqi 830046, China;3. School of Physical Science and Electronics, Centural South University, Changsha 410083, China |
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| Abstract: | By modifying the conventional one-electron hopping behavior, we study effects of an occupation-dependent hopping on the ground state of the half-filled one-dimensional pair-hopping model. At weak coupling, the use of bosonization and renormalization-group analysis techniques helps to derive the phase diagram. Such unusual hopping is shown to drive a spin-gap transition and to introduce a new region where the triplet superconducting instability dominates for positively small pair-hopping interaction. |
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| Keywords: | Pair-hopping model The occupation-dependent hopping Spin-gap transition Phase diagram Field theory |
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