[學術研究] Spin-polarized magneto-electronic properties in buckled monolayer GaAs

2月 23, 2019

獻慶簡單介紹一下最近的研究主題

標題:

Spin-polarized magneto-electronic properties in buckled monolayer GaAs

(單層皺褶砷化鎵的極化自旋磁電子性質)

作者群姓名:

Hsien-Ching Chung, Chih-Wei Chiu, Ming-Fa Lin

(鍾獻慶、邱志偉、林明發)

文章摘要:

We develop the generalized tight-binding model to fully explore the magneto-electronic properties of monolayer GaAs, where the buckled structure, multi-orbital chemical bondings, spin-orbit coupling, electric field, and magnetic field are considered simultaneously. The diverse magnetic quantization covers three groups of spin-polarized Landau levels (LLs) near the Fermi level, with the unique initial energies, LL degeneracy, energy spacings, magnetic-field-dependence, and spin splitting. Furthermore, the Landau state probabilities exhibit specific oscillation patterns, being composed of the localization centers, node regularities, and energy-dependent variations of the dominating orbitals. The density of states directly reflects the main features of the LL energy spectra in the form, height, number, and frequency of the spin-split delta-function-like prominent peaks. The electric field leads to the monotonous/nonmonotonous LL energy dispersions, LL crossing behavior, gap modulation, phase transition and enhancement of spin splitting. The complex gap modulations and even semiconductor-semimetal transitions are attributed to the strong competition among the intrinsic interactions, magnetic field, and electric field. Such predicted magneto-electronic properties could be verified by scanning tunneling spectroscopy and are helpful in designing the top-gated and phase-change electronic devices.

(中文)

我們建立了廣義緊束模型去探討單層砷化鎵的磁電子性質，其中皺褶結構、多軌域化學鍵結、自旋-軌域耦合、電場、磁場皆同時考慮。多元的磁量子化結構包含三群的自旋極化藍道能階於費米能附近，有著屬於各自獨特的初始能量、藍道簡併、能量間隔、磁場相依性、及自旋分裂。此外，藍道狀態的機率密度呈現出特定的震盪圖案，其由局域中心、節點規則、主導軌域的能量相依變化而組成。態密度直接反映出藍道能譜的主要特徵於自旋分裂得耳他函數狀主峰的形式、高度、數量、頻率上。電場導致單調/非單調藍道能階能量發散、藍道能階交錯行為、能隙調製、相變化、及自旋分裂加強。複雜的能隙調製及半導體-半金屬轉換來自於本質交互作用、磁場、電場間的強烈競爭。這些預測的磁電子性質可以使用掃描穿隧能譜來驗證，並且對於設計頂柵及相轉變電子元件有幫助。

感恩

胡耿銘、何青峰、涂維元、羅炳蒝、Ngoc Thanh Thuy Tran、王欲銘等人對該主題的討論。

簡珮如的英文修改。

鍾明輝、陳素敏、簡聯貴、高蜜李、陳富隆等人的支持。

註福印刷企業社的支持。

科技部的支持。
有這麼多的幫忙，才讓研究還有文章順利發表!

(以下直接貼出文章中的致謝內容)

We would like to thank all the contributors to this article for their valuable discussions and recommendations, especially Geng-Ming Hu, Ching-Hong Ho, Matisse Wei-Yuan Tu, Ping-Yuan Lo, Ngoc Thanh Thuy Tran, and Yu-Ming Wang. The authors thank Pei-Ju Chien for English discussions and corrections. One of us (H.C.C.) thanks Ming-Hui Chung, Su-Ming Chen, Lien-Kuei Chien, Mi-Lee Kao, and Fu-Long Chen for financial support. This work was supported in part by the Chu Fu Printing Company, Taichung, Taiwan. This work was supported in part by the Ministry of Science and Technology of Taiwan under grant numbers MOST 105-2811-M-017-003, MOST 105-2112-M-017-002-MY2, and MOST (NSC) 102-2112-M-006-007-MY3.

文章哪裡找

正式版

正式版發表於期刊Scientific Reports。是Nature出版集團旗下的一個期刊。

詳細地說是: Sci. Rep. 9, 2332 (2019)
DOI: 10.1038/s41598-018-36516-8

由於這篇文章的下載權限是Open Access，各位可歡樂地免費下載，不用擔心那動輒30到50美金的購買費。

代價是我們已經先支出了1400多美金的文章處理費Article Processing Charge (APC)。

初稿版

初稿版可於美國康乃爾大學的電子圖書館(Cornell University Library)找到: arXiv:1705.06016

這部分也是免費的，可以直接下載。

建議還是下載正式版，畢竟有太多內容在審稿流程時修改過了。

(FB link: https://www.facebook.com/hsienching.chung/posts/2391369577542664 )

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