연구 실적 – 우주 물질 연구소(국문 홈페이지)

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First-principles investigation of ferroelectric and piezoelectric properties in one-dimensional transition metal oxytetrahalides 등록일 2022.08.24 조회수 107
P. Karuna Kumari and Se Young Park * Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute, Soongsil University, Seoul 06978, Korea ㅤ ABSTRACT We perform first-principles density functional theory calculations to systematically investigate electronic structures of a quasi-one-dimensional $M O X_{4}$ ( $M = Cr, Mo, W$ , and $X = F, Cl, Br$ ) materials consisting of weakly coupled one-dimensional chains. The compositional dependence on the ferroelectric and piezoelectric properties such as switching polarization, energy barriers, Born effective charges, and piezoelectric coefficients are investigated. We find that the majority of the $M O X_{4}$ systems exhibit sizable polarization and large piezoelectric coefficients comparable to conventional ferroelectrics. More importantly, we find that the energy cost of forming a $180^{\circ}$ domain walls is negligibly small due to the weak interchain coupling, having an atomically thin domain wall with almost no reduction in the local polarization. The robust ferroelectric switching, atomically thin ferroelectric domain wall, and large piezoelectric coefficients make the $M O X_{4}$ family of materials potential candidates for applications for efficient electronic devices such as high-density ferroelectric memories and high-resolution pressure sensors. Received 18 March 2022 Revised 12 August 2022 Accepted 24 August 2022 DOI:https://doi.org/10.1103/PhysRevB.106.125118 ©2022 American Physical Society

제목 - 설명

First-principles investigation of ferroelectric and piezoelectric properties in one-dimensional transition metal oxytetrahalides
- 등록일
  
  2022.08.24
- 조회수
  
  107

P. Karuna Kumari and Se Young Park *
Department of Physics and Origin of Matter and Evolution of Galaxies (OMEG) Institute,
Soongsil University, Seoul 06978, Korea

ㅤ

ABSTRACT

We perform first-principles density functional theory calculations to systematically investigate electronic structures of a quasi-one-dimensional $M O X_{4}$ ( $M = Cr, Mo, W$ , and $X = F, Cl, Br$ ) materials consisting of weakly coupled one-dimensional chains. The compositional dependence on the ferroelectric and piezoelectric properties such as switching polarization, energy barriers, Born effective charges, and piezoelectric coefficients are investigated. We find that the majority of the $M O X_{4}$ systems exhibit sizable polarization and large piezoelectric coefficients comparable to conventional ferroelectrics. More importantly, we find that the energy cost of forming a $180^{\circ}$ domain walls is negligibly small due to the weak interchain coupling, having an atomically thin domain wall with almost no reduction in the local polarization. The robust ferroelectric switching, atomically thin ferroelectric domain wall, and large piezoelectric coefficients make the $M O X_{4}$ family of materials potential candidates for applications for efficient electronic devices such as high-density ferroelectric memories and high-resolution pressure sensors.

Received 18 March 2022
Revised 12 August 2022
Accepted 24 August 2022

DOI:https://doi.org/10.1103/PhysRevB.106.125118