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期刊论文

Spin-charge Separation in Nodal Antiferromagnetic Insulator

寇谡鹏Su-Peng Kou

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摘要/描述

In this paper, by using two dimensional (2D) Hubbard models with-flux phase and that on a hexagonal lattice as examples, we explore spin-charge-separated solitons in nodal antiferromagnetic (AF) insulator-an AF order with massive Dirac fermionic excitations (see detail in the paper). We calculate fermion zero modes and induced quantum numbers on solitons (half skyrmions) in the continuum limit, which are similar to that in the quasi one-dimensional conductor polyacetylene (CH)x and that in topological band insulator. In particular, we find some novel phenomena: thanks to an induced staggered spin moment, a mobile half skyrmion becomes a fermionic particle; when a hole or an electron is added, the half skyrmion turns into a bosonic particle with charge degree of freedom only. Our results imply that nontrivial induced quantum number on solitons may be a universal feature of spin-charge separation in di erent systems.

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版权说明:以下全部内容由寇谡鹏上传于   2010年01月04日 14时26分56秒,版权归本人所有。

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