基塔耶夫蜂巢模型中马约拉纳-费米曲面的磁电产生

R. Chari, R. Moessner, J. Rau
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引用次数: 1

摘要

研究了静磁场和静电场对基塔耶夫蜂窝模型的影响。利用适用于基塔耶夫材料的电极化算子,导出了在电场和磁场下马约拉纳费米子的二阶有效哈密顿量。我们发现,虽然单独的每个扰动不会定性地改变基塔耶夫自旋液体,但交叉项在每个狄拉克节点处诱导有限化学势,从而产生马约拉纳-费米表面。我们认为这种无间隙相是稳定的,并表现出典型的金属现象学,如线性温度热容量和有限但非量子化的热霍尔响应。最后,我们推测在基塔耶夫材料中实现这种物理的潜力。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Magnetoelectric generation of a Majorana-Fermi surface in Kitaev's honeycomb model
We study the effects of static magnetic and electric fields on Kitaev's honeycomb model. Using the electric polarization operator appropriate for Kitaev materials, we derive the effective Hamiltonian for the emergent Majorana fermions to second-order in both the electric and magnetic fields. We find that while individually each perturbation does not qualitatively alter Kitaev spin liquid, the cross-term induces a finite chemical potential at each Dirac node, giving rise to a Majorana-Fermi surface. We argue this gapless phase is stable and exhibits typical metallic phenomenology, such as linear in temperature heat capacity and finite, but non-quantized, thermal Hall response. Finally, we speculate on the potential for realization of this physics in Kitaev materials.
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