TY  - JOUR
VL  - 121
KW  - Nonlinear geophysics
KW  -  Two-dimensional electron gas
KW  -  Heterostructures
KW  -  Superlattices
KW  -  Dielectric materials
KW  -  Ferroelectricity
KW  -  Interfacial properties
KW  -  Electromagnetism
KW  -  Interfaces
KW  -  Perovskites
A1  - Zhang, Sa
A1  - Yang, Baishun
A1  - Liu, Zijiang
A1  - Zu, Xiaotao
A1  - Scanlon, David O
A1  - Huang, Bing
A1  - Qiao, Liang
A1  - Xiao, Haiyan
PB  - AIP Publishing
JF  - Applied Physics Letters
TI  - Tunable interface states driven by ferroelectric polarization discontinuity in BiFeO?-based superlattice
SN  - 0003-6951
Y1  - 2022/11/28/
AV  - public
IS  - 22
N2  - Interfacial electronic reconstruction is one of the central topics in condensed matter research as it brings in new physics and novel material properties. Typically, it is induced by dipole, valence, or lattice discontinuities near the interfaces. However, ferroelectric polarization discontinuity (FPD) can also induce electronic reconstruction, which is not well understood, particularly in perovskite oxide interfaces. Here, we demonstrate that FPD plays critical roles in determining the electronic properties of ferroelectric superlattices and creates coexisted two-dimensional hole gas (2DHG) and two-dimensional electron gas (2DEG). We further unravel that FPD competes the traditional polar discontinuity, thus, can lead to various final interface states. The present work opens a special door to achieve 2DEG and 2DHG in the ferroelectric perovskite heterostructure via ferroelectric polarization discontinuity and provides a guidance to achieve emergent interfacial phenomena.
UR  - https://doi.org/10.1063/5.0098699
ID  - discovery10161383
ER  -