Emergence of two distinct phase transitions in monolayer CoSe2 on graphene

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

doi:10.1186/s40580-024-00427-4

Title: Emergence of two distinct phase transitions in monolayer CoSe₂ on graphene

Journal Article · 24 May 2024 · Nano Convergence

DOI: https://doi.org/10.1186/s40580-024-00427-4 · OSTI ID:2367239

Rhee, Tae Gyu ^[1]; Lam, Nguyen Huu ^[2]; Kim, Yeong Gwang ^[1]; Gu, Minseon ^[1]; Hwang, Jinwoong ^[3]; Bostwick, Aaron ^[4]; Mo, Sung-Kwan ^[4]; Chun, Seung-Hyun ^[5]; Kim, Jungdae ^[2]; Chang, Young Jun ^[1];

^[6]

University of Seoul (Korea, Republic of)
Univ. of Ulsan (Korea, Republic of)
Kangwon National Univ., Chuncheon (Korea, Republic of); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
Sejong Univ., Seoul (Korea, Republic of)
University of Seoul (Korea, Republic of); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF); National Research Foundation of Korea (NRF); Gangwon Technopark (GWTP); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: AC02-05CH11231; NRF-2019R1A6A1A11053838; NRF-2020R1A2C200373211; NRF-2021R1A6A3A14040322; RS-2023-00220471; RS-2023-00284081; RS-2023-00280346; RS-2023-00258359; GWTP 2023-027; AC02-05CH11231.

OSTI ID:: 2367239

Alternate ID(s):: OSTI ID: 2404342

Journal Information:: Nano Convergence, Vol. 11, Issue 1; ISSN 2196-5404

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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Related Subjects

36 MATERIALS SCIENCE
transition metal chalcogenides
charge-density wave
electron-boson coupling
molecular beam epitaxy
angle-resolved photoemission spectroscopy
scanning tunneling microscopy

Title: Emergence of two distinct phase transitions in monolayer CoSe2 on graphene

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Title: Emergence of two distinct phase transitions in monolayer CoSe₂ on graphene