Observation of room-temperature polar skyrmions

被引：602

作者：

Das, S. ^{[1
]}

Tang, Y. L. ^{[1
,2
]}

Hong, Z. ^{[3
]}

Goncalves, M. A. P. ^{[4
]}

McCarter, M. R. ^{[5
]}

Klewe, C. ^{[6
]}

Nguyen, K. X. ^{[7
]}

Gomez-Ortiz, F. ^{[8
]}

Shafer, P. ^{[6
]}

Arenholz, E. ^{[6
]}

Stoica, V. A. ^{[9
]}

Hsu, S. -L. ^{[1
,10
]}

Wang, B. ^{[3
]}

Ophus, C. ^{[10
]}

Liu, J. F. ^{[11
]}

Nelson, C. T. ^{[12
]}

Saremi, S. ^{[1
]}

Prasad, B. ^{[1
]}

Mei, A. B. ^{[13
]}

Schlom, D. G. ^{[13
,14
]}

Iniguez, J. ^{[4
,15
]}

Garcia-Fernandez, P. ^{[8
]}

Muller, D. A. ^{[14
,16
]}

Chen, L. Q. ^{[3
]}

Junquera, J. ^{[8
]}

Martin, L. W. ^{[1
,2
]}

Ramesh, R. ^{[1
,2
,5
]}

机构：

[1] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[2] Lawrence Berkeley Natl Lab, Div Mat Sci, Berkeley, CA 94720 USA

[3] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[4] LIST, Mat Res & Technol Dept, Esch Sur Alzette, Luxembourg

[5] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[6] Lawrence Berkeley Natl Lab, Adv Light Source, Berkeley, CA USA

[7] Cornell Univ, Dept Chem & Chem Biol, Ithaca, NY USA

[8] Univ Cantabria, Dept Ciencias Tierra & Fis Mat Condensada, Santander, Spain

[9] Penn State Univ, Dept Mat Sci & Engn, University Pk, PA 16802 USA

[10] Lawrence Berkeley Natl Lab, Mol Foundry, Natl Ctr Electron Microscopy, Berkeley, CA USA

[11] Lawrence Berkeley Natl Lab, Mol Foundry, Berkeley, CA USA

[12] Oak Ridge Natl Lab, Ctr Nanophase Mat Sci, Oak Ridge, TN USA

[13] Cornell Univ, Dept Mat Sci & Engn, Ithaca, NY 14853 USA

[14] Cornell Nanoscale Sci, Kavli Inst, Ithaca, NY USA

[15] Univ Luxembourg, Phys & Mat Sci Res Unit, Belvaux, Luxembourg

[16] Cornell Univ, Sch Appl & Engn Phys, Ithaca, NY 14853 USA

来源：

NATURE | 2019年 / 568卷 / 7752期

基金：

美国国家科学基金会;

关键词：

FERROELECTRIC DOMAIN-STRUCTURES; LATTICE; VORTICES; STABILITY; STATES;

D O I：

10.1038/s41586-019-1092-8

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Complex topological configurations are fertile ground for exploring emergent phenomena and exotic phases in condensed-matter physics. For example, the recent discovery of polarization vortices and their associated complex-phase coexistence and response under applied electric fields in superlattices of (PbTiO3)(n)/(SrTiO3)(n) suggests the presence of a complex, multi-dimensional system capable of interesting physical responses, such as chirality, negative capacitance and large piezo-electric responses(1-3). Here, by varying epitaxial constraints, we discover room-temperature polar-skyrmion bubbles in a lead titanate layer confined by strontium titanate layers, which are imaged by atomic-resolution scanning transmission electron microscopy. Phase-field modelling and second-principles calculations reveal that the polar-skyrmion bubbles have a skyrmion number of +1, and resonant soft-X-ray diffraction experiments show circular dichroism, confirming chirality. Such nanometre-scale polar-skyrmion bubbles are the electric analogues of magnetic skyrmions, and could contribute to the advancement of ferroelectrics towards functionalities incorporating emergent chirality and electrically controllable negative capacitance.

引用

页码：368 / +

页数：17

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