Heat diodes made of quantum-dot nanowires

David M.T. Kuo, Chung Chang

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

We report theoretical studies of nonlinear electron heat transport in a nanowire embedded with quantum dots connected to metallic electrodes. It is demonstrated that the nonlinear Seebeck effect can lead to significant electron heat rectification for such a wire with staircase-like energy levels. The asymmetrical alignment of energy levels of such quantum-dot nanowires (QDNWs) can be controlled to allow resonant electron transport under forward temperature bias, while they are in off-resonant regime under backward bias. Once taking into account the presence of phonon heat flows, the efficiency of electron heat rectification is suppressed. However, the heat rectification ratio of QDNWs can still reach an impressive value around 10 at temperature as high as 30K for Si/Ge QDNWs with width around 3 nm, when the multi-valley degeneracy of Si QDs is taken into account.

Original languageEnglish
Title of host publication2018 IEEE 13th Nanotechnology Materials and Devices Conference, NMDC 2018
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781538610169
DOIs
StatePublished - 8 Jan 2019
Event13th IEEE Nanotechnology Materials and Devices Conference, NMDC 2018 - Portland, United States
Duration: 14 Oct 201817 Oct 2018

Publication series

Name2018 IEEE 13th Nanotechnology Materials and Devices Conference, NMDC 2018

Conference

Conference13th IEEE Nanotechnology Materials and Devices Conference, NMDC 2018
Country/TerritoryUnited States
CityPortland
Period14/10/1817/10/18

Keywords

  • heat diode
  • heat rectification
  • nonlinear thermoelectric effect
  • quantum dot nanowire

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