Phase diagram of interacting fermionic two-leg ladder with pair hopping

• 来源期刊: 中国物理B（英文版）
• 关键词: two-leg ladder pair hopping bosonization Majorana fermion
• 年，卷（期）: 2019,（2）
• 页码范围: 119-124
• 页数: 6页
• 语种: 英文
• DOI: 10.1088/1674-1056/28/2/020303

摘要

We study the phase diagram of the interacting fermionic two-leg ladder, which is featured by pair hopping and interactions of singlet and triplet superconducting channels. By using Abelian bosonization method, we obtain the full phase diagram of our model. The superconducting triplet pairing phase is characterized by a fractional edge spin and interpreted as two Kitaev chains under the mean filed approximation. The pair hopping will give rise to spin-density-wave (SDW) orders and can also support Majorana edge modes in spin channel. At half filling, the resulting Majorana-SDW phase shows additional fractionalization in charge channel, and can be interpreted as two Su–Schrieffer–Heeger (SSH) chains in the mean field regime.