visual
visual

세미나

  • HOME
  • >
  • 소식
  • >
  • 세미나
날짜 2022-05-25 14:00 
연사  
장소 E6 Room(#2501) 

Physics Seminar

 

 

 

Atomic-level insights into ferroelectric switching and preferred orientation of ultrathin hafnia

 

Duk-Hyun Choe

Samsung Advanced Institute of Technology

May. 25th (Wed), 14:00, E6 Room(#2501)

 

Over the past decade there has been a resurgence of interest in ferroelectric (FE) devices in the semiconductor device community. This interest was sparked by the discovery of ferroelectricity in a simple binary oxide, hafnia. Unlike conventional FE perovskite, FE hafnia exhibits ultra-scalable ferroelectricity compatible with Si electronics, providing an unprecedented opportunity for the use of FEs in advanced memory and logic devices. Many proof-of-concept devices based on FE hafnia are indeed showing some promise. However, their practical engineering is still largely relying on trial-and-error process that lacks a clear theoretical guidance, and it remains challenging to rationally design the FE devices for targeted applications. Thus, the community is now calling for more fundamental investigations on the physics of ferroelectricity in hafnia.

In this presentation, we briefly review the status of the field and provide our new understanding on FE switching and surface stability of hafnia. We will first introduce an ultralow FE switching mechanism that can enable rapid growth of the FE domains in hafnia [1]. We also establish a new class of topological domain walls in HfO2, which can help understand complex domain structures often present in FE hafnia samples. Next, we present our systematic study of surface-functionalized FE hafnia [2]. We show that their remnant polarization (Pr) and coercive field (Ec) can strongly depend on the surface treatments, providing a possible explanation for the enhancement of Pr in ultrathin hafnia with preferred orientation [3,4]. We believe our study represents an important step towards bridging the gap between practical engineering and the first-principles simulations in the field of FE hafnia.

 

[1] D.-H. Choe et al., Mater. Today 50, 8 (2021).

[2] D.-H. Choe et al., IEDM (2021).

[3] S. S. Cheema et. al., Nature 580, 478 (2020)

[4] H. Lee, D.-H. Choe, S. Jo 36499 (2021).13,  ACS Appl. Mater. Interfaces et. al.,

 

Contact: Prof. Chan-Ho Yang (chyang@kaist.ac.kr) ,

Departmentof Physics / Center for Lattice Defectronics

 

Department of Physics, KAIST

번호 날짜 연사 제목
공지 2025-02-24 16:00    2025년 봄학기 콜로키움 안내
공지 2025-02-27 16:00    2025년 봄 물리학과 특별세미나 (광학/응집물리 분야)
366 2025-04-29 16:00  Dr. Tokuro Shimokawa (Okinawa Institute of Science and Technology)  Can experimentally-accessible measures of entanglement distinguish quantum spin liquid and random singlet phases? file
365 2018-10-16 10:00    Capturing protein cluster dynamics and gene expression output in live cells file
364 2023-02-28 11:00    Topotactic redox engineering toward novel material file
363 2022-11-10 16:00    Probing the Origin of Cosmic Infrared Background and Future Prospects with SPHEREx
362 2015-11-10 16:00    Rapid heating of matter using high power lasers
361 2015-12-01 16:00    Introducing extra dimensions to spectroscopic studies of advanced quantum materials
360 2025-04-29 10:00  Dr. Yeonju Go (Brookhaven National Laboratory)  Exploring the Hottest Matter in the Universe: Quark-Gluon Plasma through Hard Probes and Artificial Intelligence file
359 2023-04-13 11:00    [High Energy Theory Seminar]Noninvertible Gauss Law and Axions
358 2023-12-14 16:00    Superconducting qubits for large-scale quantum computers file
357 2016-09-02 14:30    Nanoscale Thermal Physics: Seebeck Effect and Nanoscale Friction
356 2016-09-02 16:00    Quantum Electrical Transport in Topological Insulator Nanowires
355 2018-10-15 16:00    Universal properties of macroscopic current-carrying systems file
354 2018-04-11 13:30    Probing 3D Structure and Physical Properties of Materials at the Single-Atom Level file
353 2022-06-10 11:00    Record-quality two-dimensional electron systems file
352 2022-05-13 16:00    High-fidelity iToffoli gate for fixed-frequency superconducting qubits file
351 2017-05-12 13:30    Topological Dirac insulator
350 2025-07-03 14:00  Dr. Young-Gwan Choi (Max Planck Institute )  Quantum sensing with NV centers: nanoscale magnetometry file
349 2018-04-11 16:00    Non-Gaussian states of multimode light generated via hybrid quantum information processing file
348 2016-05-13 13:30    Aperiodic crystals in low dimensions
347 2022-08-09 14:00    Quantum biology in fluorescent protein: a new model system to study quantum effects in biology file