Valley and spin filtering using multiple Magnetic barriers on a TMDC nanoribbon

IF 2.1 4区物理与天体物理 Q3 PHYSICS, CONDENSED MATTER

Solid State Communications Pub Date : 2025-03-22 DOI:10.1016/j.ssc.2025.115919

Seok Jin Yang , Daehan Park , Suejeong You , Heesang Kim , Nammee Kim

{"title":"Valley and spin filtering using multiple Magnetic barriers on a TMDC nanoribbon","authors":"Seok Jin Yang , Daehan Park , Suejeong You , Heesang Kim , Nammee Kim","doi":"10.1016/j.ssc.2025.115919","DOIUrl":null,"url":null,"abstract":"<div><div>A quantum system is investigated as a valley and spin filter using the three-band tight-binding model (TBM) and Landauer–Büttiker formalism. In a transition-metal dichalcogenide (TMDC) zigzag nanoribbon (ZNR) with multiple magnetic barriers, the valley Zeeman effect causes broken valley degeneracy of the <span><math><mi>K</mi></math></span> and <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> valleys in each magnetic barrier (MB) region. The energy band shifts upward for the <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> valley and downward for the <span><math><mi>K</mi></math></span> valley, or vice versa, depending on the direction of the magnetic field. The influence of an MB on carriers moving from the source to the drain varies depending on the valley involved. Fano resonance in the <span><math><mi>K</mi></math></span> valley and resonance tunneling in the <span><math><msup><mrow><mi>K</mi></mrow><mrow><mo>′</mo></mrow></msup></math></span> valley make the main contributions to valley polarization. With intrinsic spin–orbit coupling (SOC) and the ordinary Zeeman effect, the spin degeneracy of the energy bands in both valleys is broken, leading to spin polarization. Both polarizations can be enhanced by increasing either the number of MBs or the strength of the external magnetic field. With the optimized parameters of this system, it is possible to obtain currents with selective spin and valley by manipulating the incident carrier energy. An experimental implementation of this system could enable control over the carriers’ spin and valley degrees of freedom in upcoming devices.</div></div>","PeriodicalId":430,"journal":{"name":"Solid State Communications","volume":"401 ","pages":"Article 115919"},"PeriodicalIF":2.1000,"publicationDate":"2025-03-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Solid State Communications","FirstCategoryId":"101","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S0038109825000948","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}

引用次数: 0

Abstract

A quantum system is investigated as a valley and spin filter using the three-band tight-binding model (TBM) and Landauer–Büttiker formalism. In a transition-metal dichalcogenide (TMDC) zigzag nanoribbon (ZNR) with multiple magnetic barriers, the valley Zeeman effect causes broken valley degeneracy of the

K

and

K^{'}

valleys in each magnetic barrier (MB) region. The energy band shifts upward for the

K^{'}

valley and downward for the

K

valley, or vice versa, depending on the direction of the magnetic field. The influence of an MB on carriers moving from the source to the drain varies depending on the valley involved. Fano resonance in the

K

valley and resonance tunneling in the

K^{'}

valley make the main contributions to valley polarization. With intrinsic spin–orbit coupling (SOC) and the ordinary Zeeman effect, the spin degeneracy of the energy bands in both valleys is broken, leading to spin polarization. Both polarizations can be enhanced by increasing either the number of MBs or the strength of the external magnetic field. With the optimized parameters of this system, it is possible to obtain currents with selective spin and valley by manipulating the incident carrier energy. An experimental implementation of this system could enable control over the carriers’ spin and valley degrees of freedom in upcoming devices.

查看原文本刊更多论文

求助全文

约1分钟内获得全文求助全文

来源期刊

Solid State Communications 物理-物理：凝聚态物理

CiteScore

3.40

自引率

4.80%

发文量

287

审稿时长

51 days

期刊介绍： Solid State Communications is an international medium for the publication of short communications and original research articles on significant developments in condensed matter science, giving scientists immediate access to important, recently completed work. The journal publishes original experimental and theoretical research on the physical and chemical properties of solids and other condensed systems and also on their preparation. The submission of manuscripts reporting research on the basic physics of materials science and devices, as well as of state-of-the-art microstructures and nanostructures, is encouraged. A coherent quantitative treatment emphasizing new physics is expected rather than a simple accumulation of experimental data. Consistent with these aims, the short communications should be kept concise and short, usually not longer than six printed pages. The number of figures and tables should also be kept to a minimum. Solid State Communications now also welcomes original research articles without length restrictions. The Fast-Track section of Solid State Communications is the venue for very rapid publication of short communications on significant developments in condensed matter science. The goal is to offer the broad condensed matter community quick and immediate access to publish recently completed papers in research areas that are rapidly evolving and in which there are developments with great potential impact.