Artificial two-dimensional polar metal at room temperature
Polar metals, commonly defined by the coexistence of polar crystal structure and metallicity, are thought to be scarce because the long-range electrostatic fields favoring the polar structure are expected to be fully screened by the conduction electrons of a metal. Moreover, reducing from three to two dimensions, it remains an open question whether a polar metal can exist. Here we report on the realization of a room temperature two-dimensional polar metal of the B-site type in tri-color (tri-layer) superlattices BaTiO 3/SrTiO 3/LaTiO 3. A combination of atomic resolution scanning transmission electron microscopy with electron energy-loss spectroscopy, optical second harmonic generation, electrical transport, and first-principles calculations have revealed the microscopic mechanisms of periodic electric polarization, charge distribution, and orbital symmetry. Lastly, our results provide a route to creating all-oxide artificial non-centrosymmetric quasi-two-dimensional metals with exotic quantum states including coexisting ferroelectric, ferromagnetic, and superconducting phases.
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Magnetic Materials and Devices, Ningbo Inst. of Materials Technology and Engineering
- Louisiana State Univ., Baton Rouge, LA (United States). Dept. of Physics and Astronomy; Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- Univ. of California, Berkeley, CA (United States). Dept. of Physics
- Pennsylvania State Univ., University Park, PA (United States). Dept. of Material Sciences and Engineering and Materials Research Inst.
- Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
- Univ. of Arkansas, Fayetteville, AR (United States). Dept. of Physics; Indian Inst. of Science, Bangalore (India). Dept. of Physics
- Brookhaven National Lab. (BNL), Upton, NY (United States). Condensed Matter Physics and Materials Science Dept.
- European Synchrotron Radiation Facility (ESRF), Grenoble (France). XMas CRG
- Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Dublin City Univ., Dublin (Ireland). School of Physical Sciences
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Advanced Light Source (ALS)
- Publication Date:
- Report Number(s):
Journal ID: ISSN 2041-1723
- Grant/Contract Number:
- SC0012704; AC02-05CH11231
- Accepted Manuscript
- Journal Name:
- Nature Communications
- Additional Journal Information:
- Journal Volume: 9; Journal Issue: 1; Journal ID: ISSN 2041-1723
- Nature Publishing Group
- Research Org:
- Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Org:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
- Country of Publication:
- United States
- 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
- OSTI Identifier:
- Alternate Identifier(s):
- OSTI ID: 1460354