arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1506.03322cond-mat.mes-hall
收藏

磁性二维电子气中的磁阻量子振荡

Magneto-resistance quantum oscillations in a magnetic two-dimensional electron gas

J. Kunc, B. A. Piot, D. K. Maude, M. Potemski, R. Grill, C. Betthausen, D. Weiss, V. Kolkovsky, G. Karczewski, T. Wojtowicz

摘要:

利用磁输运方法测量了CdTe和CdMnTe量子阱中二维电子气的Shubnikov-de Haas(SdH)振荡.在CdMnTe中,2DEG与磁性Mn离子相互作用的量子振荡,可以通过将电子-Mn交换相互作用纳入传统的Lifshitz-Kosevich形式主义来描述。修正的自旋分裂导致SdH振荡中的特征拍频模式,其研究表明Mn团簇的形成导致直接的反铁磁Mn-Mn相互作用。在这个系统中的朗道能级加宽显示出一个特殊的下降,随着温度的升高,这可能与统计波动的Mn浓度。

英文摘要:

Magneto-transport measurements of Shubnikov-de Haas (SdH) oscillations have been performed on two-dimensional electron gases (2DEGs) confined in CdTe and CdMnTe quantum wells. The quantum oscillations in CdMnTe, where the 2DEG interacts with magnetic Mn ions, can be described by incorporating the electron-Mn exchange interaction into the traditional Lifshitz-Kosevich formalism. The modified spin splitting leads to characteristic beating pattern in the SdH oscillations, the study of which indicates the formation of Mn clusters resulting in direct anti-ferromagnetic Mn-Mn interaction. The Landau level broadening in this system shows a peculiar decrease with increasing temperature, which could be related to statistical fluctuations of the Mn concentration.

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。

↑