Tuning Exciton Emission via Ferroelectric Polarization at a Heterogeneous Interface between a Monolayer Transition Metal Dichalcogenide and a Perovskite Oxide Membrane

Jaehong Choi; Kevin J Crust; Lizhong Li; Kihong Lee; Jialun Luo; Jae-Pil So; Kenji Watanabe; Takashi Taniguchi; Harold Y Hwang; Kin Fai Mak; Jie Shan; Gregory D Fuchs

doi:10.1021/acs.nanolett.4c01853

Tuning Exciton Emission via Ferroelectric Polarization at a Heterogeneous Interface between a Monolayer Transition Metal Dichalcogenide and a Perovskite Oxide Membrane

Nano Lett. 2024 Jul 24;24(29):8948-8955. doi: 10.1021/acs.nanolett.4c01853. Epub 2024 Jul 12.

Authors

Jaehong Choi¹, Kevin J Crust^{2

3}, Lizhong Li¹, Kihong Lee⁴, Jialun Luo⁴, Jae-Pil So¹, Kenji Watanabe⁵, Takashi Taniguchi⁵, Harold Y Hwang^{3

6}, Kin Fai Mak^{1

4

7}, Jie Shan^{1

4

7}, Gregory D Fuchs^{1

7}

Affiliations

¹ School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14850, United States.
² Department of Physics, Stanford University, Stanford, California 94305, United States.
³ Stanford Institute for Materials and Energy Sciences, SLAC National Accelerator Laboratory, Menlo Park, California 94025, United States.
⁴ Department of Physics, Cornell University, Ithaca, New York 14850, United States.
⁵ Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan.
⁶ Department of Applied Physics, Stanford University, Stanford, California 94305, United States.
⁷ Kavli Institute at Cornell for Nanoscale Science, Ithaca, New York 14850, United States.

PMID: 38996059
DOI: 10.1021/acs.nanolett.4c01853

Abstract

We demonstrate the integration of a thin BaTiO₃ (BTO) membrane with monolayer MoSe₂ in a dual-gate device that enables in situ manipulation of the BTO ferroelectric polarization with a voltage pulse. While two-dimensional (2D) transition metal dichalcogenides (TMDs) offer remarkable adaptability, their hybrid integration with other families of functional materials beyond the realm of 2D materials has been challenging. Released functional oxide membranes offer a solution for 2D/3D integration via stacking. 2D TMD excitons can serve as a local probe of the ferroelectric polarization in BTO at a heterogeneous interface. Using photoluminescence (PL) of MoSe₂ excitons to optically read out the doping level, we find that the relative population of charge carriers in MoSe₂ depends sensitively on the ferroelectric polarization. This finding points to a promising avenue for future-generation versatile sensing devices with high sensitivity, fast readout, and diverse applicability for advanced signal processing.

Keywords: barium titanate (BaTiO3); ferroelectric perovskite oxide; freestanding oxide membrane; hybrid interface; mixed-dimensional heterostructure; molybdenum diselenide (MoSe2).