April 22 - 26, 2024
Seattle, Washington
May 7 - 9, 2024 (Virtual)

Event Supporters

2024 MRS Spring Meeting
EL05.13.03

Simultaneous Strain and Gate Tunability of Moiré Heterostructure Devices

When and Where

Apr 26, 2024
11:00am - 11:15am
Room 344, Level 3, Summit

Presenter(s)

Co-Author(s)

Jordan Fonseca1,John Cenker1,2,Mai Nguyen1,Chaowei Hu1,Wang Xi1,George Rickey1,Takashi Taniguchi3,Kenji Watanabe3,Jiun-Haw Chu1,Xiaodong Xu1

University of Washington1,Columbia University2,National Institute for Materials Science3

Abstract

Jordan Fonseca1,John Cenker1,2,Mai Nguyen1,Chaowei Hu1,Wang Xi1,George Rickey1,Takashi Taniguchi3,Kenji Watanabe3,Jiun-Haw Chu1,Xiaodong Xu1

University of Washington1,Columbia University2,National Institute for Materials Science3
Moiré heterostructures of 2D materials have served as a platform for studying and engineering a wide variety of correlated phenomena and many body physics. The atomic thickness of two-dimensional materials and the large effective lattice constant of moiré superlattices make electrostatic gating a particularly effective way to tune carrier density and thereby explore a rich phase diagram of correlated effects. Independently, two dimensional materials exhibit unusually high elasticity and can sustain significant uniaxial strain before yielding. Uniaxial strain breaks rotational symmetry and changes interatomic spacing, altering many material properties in the process. An outstanding challenge, however, is simultaneously and independently tuning uniaxial strain and electrostatic gating in-situ at cryogenic temperatures. In this talk, I will discuss our work to leverage novel approaches for efficient strain transfer to the moiré heterostructure in gateable van der Waals devices. I will show how the ability to traverse the strain-gating phase space for a high-quality transition metal dichalcogenide moiré heterostructure enables exploration of novel features in the photoluminescence spectra and discuss their origin in the underlying optoelectronic properties of this rich material system.

Keywords

elastic properties | optical properties | spectroscopy

Symposium Organizers

Silvija Gradecak, National University of Singapore
Lain-Jong Li, The University of Hong Kong
Iuliana Radu, TSMC Taiwan
John Sudijono, Applied Materials, Inc.

Symposium Support

Gold
Applied Materials

Session Chairs

Ali Javey
Iuliana Radu

In this Session