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Title: Interlayer Coupling Controlled Ordering and Phases in Polar Vortex Superlattices

Journal Article · · Nano Letters
ORCiD logo [1];  [1];  [2]; ORCiD logo [3];  [1]; ORCiD logo [4];  [5];  [6]; ORCiD logo [4];  [7]; ORCiD logo [8]; ORCiD logo [3]; ORCiD logo [9];  [4];  [7]
  1. University of California, Berkeley, CA (United States)
  2. Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)
  3. Penn State University, State College, PA (United States)
  4. Universidad de Cantabria, Santander (Spain)
  5. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  6. Argonne National Laboratory (ANL), Argonne, IL (United States)
  7. University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Rice University, Houston, TX (United States)
  8. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
  9. University of Virginia, Charlottesville, VA (United States)

The recent discovery of polar topological structures has opened the door for exciting physics and emergent properties. There is, however, little methodology to engineer stability and ordering in these systems, properties of interest for engineering emergent functionalities. Notably, when the surface area is extended to arbitrary thicknesses, the topological polar texture becomes unstable. Here we show that this instability of the phase is due to electrical coupling between successive layers. We demonstrate that this electrical coupling is indicative of an effective screening length in the dielectric, similar to the conductor–ferroelectric interface. Controlling the electrostatics of the superlattice interfaces, the system can be tuned between a pure topological vortex state and a mixed classical-topological phase. This coupling also enables engineering coherency among the vortices, not only tuning the bulk phase diagram but also enabling the emergence of a 3D lattice of polar textures.

Research Organization:
University of California, Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); US Army Research Office (ARO); US Department of the Navy, Office of Naval Research (ONR); USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-05CH11231; W911NF-21-1-0119; N00014-23-1-2630
OSTI ID:
2315720
Alternate ID(s):
OSTI ID: 2323455
Journal Information:
Nano Letters, Vol. 24, Issue 10; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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