Dielectric disorder in two-dimensional materials
Artikel i vetenskaplig tidskrift, 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.

Författare

A. Raja

University of California

Lawrence Berkeley National Laboratory

Lutz Waldecker

Stanford University

Jonas Zipfel

Universität Regensburg

Yeongsu Cho

The James Franck Institute

Samuel Brem

Chalmers, Fysik, Kondenserade materiens teori

Jonas D. Ziegler

Universität Regensburg

Marvin Kulig

Universität Regensburg

Takashi Taniguchi

National Institute for Materials Science (NIMS)

Kenji Watanabe

National Institute for Materials Science (NIMS)

Ermin Malic

Chalmers, Fysik, Kondenserade materiens teori

T. F. Heinz

Stanford University

Timothy C. Berkelbach

Columbia University in the City of New York

Flatiron Institute

A. Chernikov

Universität Regensburg

Nature Nanotechnology

1748-3387 (ISSN)

Ämneskategorier

Annan kemi

Annan materialteknik

Den kondenserade materiens fysik

DOI

10.1038/s41565-019-0520-0

Mer information

Senast uppdaterat

2019-11-08