Dielectric disorder in two-dimensional materials
Journal article, 2019

Understanding and controlling disorder is key to nanotechnology and materials science. Traditionally, disorder is attributed to local fluctuations of inherent material properties such as chemical and structural composition, doping or strain. Here, we present a fundamentally new source of disorder in nanoscale systems that is based entirely on the local changes of the Coulomb interaction due to fluctuations of the external dielectric environment. Using two-dimensional semiconductors as prototypes, we experimentally monitor dielectric disorder by probing the statistics and correlations of the exciton resonances, and theoretically analyse the influence of external screening and phonon scattering. Even moderate fluctuations of the dielectric environment are shown to induce large variations of the bandgap and exciton binding energies up to the 100 meV range, often making it a dominant source of inhomogeneities. As a consequence, dielectric disorder has strong implications for both the optical and transport properties of nanoscale materials and their heterostructures.


A. Raja

University of California

Lawrence Berkeley National Laboratory

Lutz Waldecker

Stanford University

Jonas Zipfel

University of Regensburg

Yeongsu Cho

The James Franck Institute

Samuel Brem

Chalmers, Physics, Condensed Matter Theory

Jonas D. Ziegler

University of Regensburg

Marvin Kulig

University of Regensburg

Takashi Taniguchi

National Institute for Materials Science (NIMS)

Kenji Watanabe

National Institute for Materials Science (NIMS)

Ermin Malic

Chalmers, Physics, Condensed Matter Theory

T. F. Heinz

Stanford University

Timothy C. Berkelbach

Columbia University

Flatiron Institute

A. Chernikov

University of Regensburg

Nature Nanotechnology

1748-3387 (ISSN)

Subject Categories

Other Chemistry Topics

Other Materials Engineering

Condensed Matter Physics



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