arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0706.2822cond-mat.mes-hall
收藏

石墨烯中的量子霍尔激活能隙

Quantum-Hall activation gaps in graphene

A. J. M. Giesbers, U. Zeitler, M. I. Katsnelson, L. A. Ponomarenko, T. M. G. Mohiuddin, J. C. Maan

摘要:

我们测量了填充因子为$ν=2$和$ν=6$的石墨烯在磁场高达32 T和温度从4 K到300 K的量子霍尔激活间隙。$ν=6$能隙可以用热激发到宽为400 K的朗道能级来描述。与此相反,在$ν=2$测量的间隙是强烈的温度和场的依赖性,并接近预期值为场$B > 20$ T和温度$T > 100$ K的尖锐朗道能级。我们解释了这种令人惊讶的行为的最低朗道水平的缩小。

英文摘要:

We have measured the quantum-Hall activation gaps in graphene at filling factors $ν=2$ and $ν=6$ for magnetic fields up to 32 T and temperatures from 4 K to 300 K. The $ν=6$ gap can be described by thermal excitation to broadened Landau levels with a width of 400 K. In contrast, the gap measured at $ν=2$ is strongly temperature and field dependent and approaches the expected value for sharp Landau levels for fields $B > 20$ T and temperatures $T > 100$ K. We explain this surprising behavior by a narrowing of the lowest Landau level.

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。

↑