Measuring and Tuning the Potential Landscape of Electrostatically Defined Quantum Dots in Graphene.

Nano Letters
Wyatt A BehnVictor W Brar

Abstract

We use Kelvin probe force microscopy (KPFM) to probe the carrier-dependent potential of an electrostatically defined quantum dot (QD) in a graphene/hexagonal boron nitride (hBN) heterostructure. We show that gate-dependent measurements enable a calibration scheme that corrects for uncertainty inherent in typical KPFM measurements and accurately reconstructs the potential well profile. Our measurements reveal how the well changes with carrier concentration, which we associate with the nonlinear dependence of graphene's work function on carrier density. These changes shift the energy levels of quasi-bound states in the QD which we can measure via scanning tunneling spectroscopy (STS). We show that the experimentally extracted energy levels closely compare with wave functions calculated from the reconstructed KPFM data. This methodology, where KPFM and STS data are simultaneously acquired from 2D materials, allows the quasiparticle response to an electrostatic potential to be determined in a self-consistent way.

References

Jul 14, 2007·Science·G M RutterJ A Stroscio
Nov 13, 2007·Physical Review Letters·Vitor M PereiraA H Castro Neto
Feb 1, 2008·Physical Review Letters·A V ShytovL S Levitov
Oct 15, 2008·Physical Review Letters·Cheol-Hwan ParkSteven G Louie
Feb 12, 2009·ACS Nano·Dimitri S H CharrierRené A J Janssen
Sep 2, 2009·Nano Letters·Young-Jun YuPhilip Kim
Aug 24, 2010·Nature Nanotechnology·C R DeanJ Hone
Jan 15, 2011·Nanotechnology·Dominik Ziegler, Andreas Stemmer
Mar 1, 2012·Nanotechnology·Keith A BrownRobert M Westervelt
Mar 9, 2013·Science·Yang WangMichael F Crommie
Sep 7, 2013·Scientific Reports·Vishal PanchalOlga Kazakova
Jan 25, 2014·Physical Chemistry Chemical Physics : PCCP·Yuriy Dedkov, Elena Voloshina
Aug 30, 2014·Physical Review Letters·Alexey ChernikovTony F Heinz
May 27, 2017·Science·Fereshte GhahariJoseph A Stroscio
Jul 24, 2018·Nano Letters·Jairo VelascoMichael F Crommie
Aug 25, 2018·Science·Christopher GutiérrezJoseph A Stroscio
Feb 3, 2019·The Review of Scientific Instruments·Franz J Giessibl
Jun 12, 2019·Nature Materials·Christian WagnerF Stefan Tautz
Aug 2, 2019·Nature·Alexander KerelskyAbhay N Pasupathy
Nov 20, 2020·Nature Materials·Eva Y Andrei, Allan H MacDonald

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.