arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1611.09752cond-mat.mes-hallcond-mat.mtrl-scicond-mat.quant-gascond-mat.stat-mechcond-mat.str-el
收藏

磁振量子霍尔效应与Wiedemann-Franz定律

Magnonic quantum Hall effect and Wiedemann-Franz law

Kouki Nakata, Jelena Klinovaja, Daniel Loss

摘要:

本文研究了有限温度下二维干净绝缘磁体中磁振子的量子霍尔效应。通过Aharonov-Casher效应,在电场中运动的磁振子获得几何相位,并在电场梯度中形成朗道能级。在低温下,最低能带几乎是平坦的,带有与Berry曲率相关的陈数。适当地定义玻色子的热导,我们发现磁振子霍尔电导得到量子化,并显示出普遍的热磁行为,即,是独立的材料,并遵守Wiedemann-Franz法律的磁振子运输。我们认为磁振子与二次和线性(Dirac-like)分散。最后,我们表明,我们的预测是在实验范围内的铁磁体和skyrmion晶格与当前的设备和测量技术。

英文摘要:

We present a quantum Hall effect of magnons in two-dimensional clean insulating magnets at finite temperature. Through the Aharonov-Casher effect, a magnon moving in an electric field acquires a geometric phase and forms Landau levels in an electric field gradient of sawtooth form. At low temperatures, the lowest energy band being almost flat carries a Chern number associated with a Berry curvature. Appropriately defining the thermal conductance for bosons, we find that the magnon Hall conductances get quantized and show a universal thermomagnetic behavior, i.e., are independent of materials, and obey a Wiedemann-Franz law for magnon transport. We consider magnons with quadratic and linear (Dirac-like) dispersions. Finally, we show that our predictions are within experimental reach for ferromagnets and skyrmion lattices with current device and measurement techniques.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑