Observation of anti-bonding excited state in charging diagram of a few-electron double dot

Tsuyoshi Hatano; Yasuhiro Tokura; Shinichi Amaha; Toshihiro Kubo; Seigo Tarucha

doi:10.1016/j.physe.2007.08.062

Observation of anti-bonding excited state in charging diagram of a few-electron double dot

Tsuyoshi Hatano, Yasuhiro Tokura, Shinichi Amaha, Toshihiro Kubo, Seigo Tarucha

SCI - Physics

Research output: Contribution to journal › Article › peer-review

1 Citation (Scopus)

Abstract

We fabricated a unique hybrid vertical-lateral double dot device with two dots coupled in parallel to study the excitation energy spectra with the number of electrons in each dot and inter-dot level detuning as parameters. We measured the charging diagram for a finite bias voltage and observed the tunnel-coupled bonding state and anti-bonding state. The separation between the two states is a direct measure of the inter-dot tunnel coupling energy. We use this energy and other characteristic energies derived from the charging diagram to characterize the exchange interaction energy.

Original language	English
Pages (from-to)	1238-1240
Number of pages	3
Journal	Physica E: Low-Dimensional Systems and Nanostructures
Volume	40
Issue number	5
DOIs	https://doi.org/10.1016/j.physe.2007.08.062
Publication status	Published - 2008 Mar 1

Keywords

Bonding and anti-bonding states
Ground and excited states
Tunnel coupling

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Atomic and Molecular Physics, and Optics
Condensed Matter Physics

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abstract = "We fabricated a unique hybrid vertical-lateral double dot device with two dots coupled in parallel to study the excitation energy spectra with the number of electrons in each dot and inter-dot level detuning as parameters. We measured the charging diagram for a finite bias voltage and observed the tunnel-coupled bonding state and anti-bonding state. The separation between the two states is a direct measure of the inter-dot tunnel coupling energy. We use this energy and other characteristic energies derived from the charging diagram to characterize the exchange interaction energy.",

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T1 - Observation of anti-bonding excited state in charging diagram of a few-electron double dot

AU - Hatano, Tsuyoshi

AU - Tokura, Yasuhiro

AU - Amaha, Shinichi

AU - Kubo, Toshihiro

AU - Tarucha, Seigo

PY - 2008/3/1

Y1 - 2008/3/1

N2 - We fabricated a unique hybrid vertical-lateral double dot device with two dots coupled in parallel to study the excitation energy spectra with the number of electrons in each dot and inter-dot level detuning as parameters. We measured the charging diagram for a finite bias voltage and observed the tunnel-coupled bonding state and anti-bonding state. The separation between the two states is a direct measure of the inter-dot tunnel coupling energy. We use this energy and other characteristic energies derived from the charging diagram to characterize the exchange interaction energy.

AB - We fabricated a unique hybrid vertical-lateral double dot device with two dots coupled in parallel to study the excitation energy spectra with the number of electrons in each dot and inter-dot level detuning as parameters. We measured the charging diagram for a finite bias voltage and observed the tunnel-coupled bonding state and anti-bonding state. The separation between the two states is a direct measure of the inter-dot tunnel coupling energy. We use this energy and other characteristic energies derived from the charging diagram to characterize the exchange interaction energy.

KW - Bonding and anti-bonding states

KW - Ground and excited states

KW - Tunnel coupling

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JO - Physica E: Low-Dimensional Systems and Nanostructures

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