Emergence of two distinct phase transitions in monolayer CoSe2 on graphene

IF 13.4 2区材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY

Nano Convergence Pub Date : 2024-05-24 DOI:10.1186/s40580-024-00427-4

Tae Gyu Rhee, Nguyen Huu Lam, Yeong Gwang Kim, Minseon Gu, Jinwoong Hwang, Aaron Bostwick, Sung-Kwan Mo, Seung-Hyun Chun, Jungdae Kim, Young Jun Chang, Byoung Ki Choi

{"title":"Emergence of two distinct phase transitions in monolayer CoSe2 on graphene","authors":"Tae Gyu Rhee, Nguyen Huu Lam, Yeong Gwang Kim, Minseon Gu, Jinwoong Hwang, Aaron Bostwick, Sung-Kwan Mo, Seung-Hyun Chun, Jungdae Kim, Young Jun Chang, Byoung Ki Choi","doi":"10.1186/s40580-024-00427-4","DOIUrl":null,"url":null,"abstract":"<div><p>Dimensional modifications play a crucial role in various applications, especially in the context of device miniaturization, giving rise to novel quantum phenomena. The many-body dynamics induced by dimensional modifications, including electron-electron, electron-phonon, electron-magnon and electron-plasmon coupling, are known to significantly affect the atomic and electronic properties of the materials. By reducing the dimensionality of orthorhombic CoSe<sub>2</sub> and forming heterostructure with bilayer graphene using molecular beam epitaxy, we unveil the emergence of two types of phase transitions through angle-resolved photoemission spectroscopy and scanning tunneling microscopy measurements. We disclose that the 2 × 1 superstructure is associated with charge density wave induced by Fermi surface nesting, characterized by a transition temperature of 340 K. Additionally, another phase transition at temperature of 160 K based on temperature dependent gap evolution are observed with renormalized electronic structure induced by electron-boson coupling. These discoveries of the electronic and atomic modifications, influenced by electron-electron and electron-boson interactions, underscore that many-body physics play significant roles in understanding low-dimensional properties of non-van der Waals Co-chalcogenides and related heterostructures.</p><h3>Graphical Abstract</h3><div><figure><div><div><picture><source><img></source></picture></div><div><p>Two different pseudo-gaps and corresponding phase transitions are observed in monolayer orthorhombic CoSe<sub>2</sub> grown on graphene substrates.</p></div></div></figure></div></div>","PeriodicalId":712,"journal":{"name":"Nano Convergence","volume":"11 1","pages":""},"PeriodicalIF":13.4000,"publicationDate":"2024-05-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://nanoconvergencejournal.springeropen.com/counter/pdf/10.1186/s40580-024-00427-4","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Nano Convergence","FirstCategoryId":"88","ListUrlMain":"https://link.springer.com/article/10.1186/s40580-024-00427-4","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q1","JCRName":"MATERIALS SCIENCE, MULTIDISCIPLINARY","Score":null,"Total":0}

引用次数: 0

Abstract

Dimensional modifications play a crucial role in various applications, especially in the context of device miniaturization, giving rise to novel quantum phenomena. The many-body dynamics induced by dimensional modifications, including electron-electron, electron-phonon, electron-magnon and electron-plasmon coupling, are known to significantly affect the atomic and electronic properties of the materials. By reducing the dimensionality of orthorhombic CoSe₂ and forming heterostructure with bilayer graphene using molecular beam epitaxy, we unveil the emergence of two types of phase transitions through angle-resolved photoemission spectroscopy and scanning tunneling microscopy measurements. We disclose that the 2 × 1 superstructure is associated with charge density wave induced by Fermi surface nesting, characterized by a transition temperature of 340 K. Additionally, another phase transition at temperature of 160 K based on temperature dependent gap evolution are observed with renormalized electronic structure induced by electron-boson coupling. These discoveries of the electronic and atomic modifications, influenced by electron-electron and electron-boson interactions, underscore that many-body physics play significant roles in understanding low-dimensional properties of non-van der Waals Co-chalcogenides and related heterostructures.

Graphical Abstract

Two different pseudo-gaps and corresponding phase transitions are observed in monolayer orthorhombic CoSe₂ grown on graphene substrates.

查看原文本刊更多论文

石墨烯上单层 CoSe2 出现两种截然不同的相变。

在各种应用中，特别是在设备微型化的背景下，尺寸改性起着至关重要的作用，并引发了新的量子现象。众所周知，由尺寸修饰引起的多体动力学，包括电子-电子、电子-声子、电子-磁子和电子-等离子体耦合，会显著影响材料的原子和电子特性。通过降低正交态 CoSe2 的尺寸，并利用分子束外延技术与双层石墨烯形成异质结构，我们通过角度分辨光发射光谱和扫描隧道显微镜测量揭示了两种相变的出现。我们发现，2 × 1 超结构与费米面嵌套诱导的电荷密度波有关，其过渡温度为 340 K。此外，我们还观察到另一种相变，其温度为 160 K，基于电子-玻色子耦合诱导的重规范化电子结构的温度依赖性间隙演化。这些受电子-电子和电子-玻色子相互作用影响的电子和原子修饰的发现，强调了多体物理学在理解非范德华共钙钛矿及相关异质结构的低维特性方面发挥着重要作用。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

求助全文

约1分钟内获得全文求助全文

来源期刊

Nano Convergence Engineering-General Engineering

CiteScore

15.90

自引率

2.60%

发文量

审稿时长

13 weeks

期刊介绍： Nano Convergence is an internationally recognized, peer-reviewed, and interdisciplinary journal designed to foster effective communication among scientists spanning diverse research areas closely aligned with nanoscience and nanotechnology. Dedicated to encouraging the convergence of technologies across the nano- to microscopic scale, the journal aims to unveil novel scientific domains and cultivate fresh research prospects. Operating on a single-blind peer-review system, Nano Convergence ensures transparency in the review process, with reviewers cognizant of authors' names and affiliations while maintaining anonymity in the feedback provided to authors.