期刊
SCIENCE
卷 349, 期 6254, 页码 1314-1317出版社
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/science.aaa6442
关键词
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资金
- National Science Foundation (NSF) under Designing Materials to Revolutionize and Engineer our Future (DMREF) [DMR-1234096]
- NSF through the Materials Research Science and Engineering Center (MRSEC) [DMR-1420645]
- Global Frontier Hybrid Interface Materials of the National Research Foundation of Korea - Korea Government [2013M3A6B1078872]
- Penn State NSF-MRSEC Center for Nanoscale Science [DMR-1420620]
- NSF [DMR-1410714, DMR-1006136]
- Computational Design of Functional Layered Materials, an Energy Frontier Research Center - U.S. Department of Energy (DOE), Office of Science, Basic Energy Sciences [DE-SC0012575]
- Asian Office of Aerospace Research and Development (AOARD) [FA2386-15-1-4046]
- Brain Korea 21 PLUS project for Center for Creative Industrial Materials [F14SN02D1707]
- National Research Foundation (NRF) of Korea - Korean Government [2015R1A2A2A01007904]
- MRSEC Program of the National Science Foundation [DMR-1121053]
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1410714] Funding Source: National Science Foundation
- Direct For Mathematical & Physical Scien
- Division Of Materials Research [1234096] Funding Source: National Science Foundation
- National Research Council of Science & Technology (NST), Republic of Korea [PNK4180] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
- National Research Foundation of Korea [2015R1A2A2A01007904] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
The enhancement of the functional properties of materials at reduced dimensions is crucial for continuous advancements in nanoelectronic applications. Here, we report that the scale reduction leads to the emergence of an important functional property, ferroelectricity, challenging the long-standing notion that ferroelectricity is inevitably suppressed at the scale of a few nanometers. A combination of theoretical calculations, electrical measurements, and structural analyses provides evidence of room-temperature ferroelectricity in strain-free epitaxial nanometer-thick films of otherwise nonferroelectric strontium titanate (SrTiO3). We show that electrically induced alignment of naturally existing polar nanoregions is responsible for the appearance of a stable net ferroelectric polarization in these films. This finding can be useful for the development of low-dimensional material systems with enhanced functional properties relevant to emerging nanoelectronic devices.
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