Gate-tunable charge carrier electrocaloric effect in trilayer graphene

Abstract The electrocaloric (EC) effect is the change in temperature and entropy of a material driven by the application of an electric field. Our tight-binding calculations linked to Fermi statistics, show that the EC effect can be produced in trilayer graphene (TLG) structures connected to a heat...

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Autores principales:	Natalia Cortés, Oscar Negrete, Francisco J. Peña, Patricio Vargas
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2021
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/695909ff3cd3487c811eea22a3e67fee
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spelling	oai:doaj.org-article:695909ff3cd3487c811eea22a3e67fee2021-11-14T12:23:06ZGate-tunable charge carrier electrocaloric effect in trilayer graphene10.1038/s41598-021-01057-02045-2322https://doaj.org/article/695909ff3cd3487c811eea22a3e67fee2021-11-01T00:00:00Zhttps://doi.org/10.1038/s41598-021-01057-0https://doaj.org/toc/2045-2322Abstract The electrocaloric (EC) effect is the change in temperature and entropy of a material driven by the application of an electric field. Our tight-binding calculations linked to Fermi statistics, show that the EC effect can be produced in trilayer graphene (TLG) structures connected to a heat source, triggered by changes in the electronic density of states (DOS) at the Fermi level when external gate fields are applied on the outer graphene layers. We demonstrate that entropy changes are sensitive to the stacking arrangement in TLG systems. The AAA-stacked TLG presents an inverse EC response (cooling) regardless of the temperature value and gate field potential strength, whereas the EC effect in ABC-stacked TLG remains direct (heating) above room temperature. We reveal otherwise the TLG with Bernal-ABA stacking generates both the direct and inverse EC response within the same sample, associated with gate-dependent electronic transitions of thermally excited charge carriers from the valence band to the conduction band in the band structure. The novel charge carrier electrocaloric effect we propose in quantum layered systems may bring a wide variety of prototype van der Waals materials that could be used as versatile platforms to controlling the thermal response in nanodevices.Natalia CortésOscar NegreteFrancisco J. PeñaPatricio VargasNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 11, Iss 1, Pp 1-13 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q Natalia Cortés Oscar Negrete Francisco J. Peña Patricio Vargas Gate-tunable charge carrier electrocaloric effect in trilayer graphene
description	Abstract The electrocaloric (EC) effect is the change in temperature and entropy of a material driven by the application of an electric field. Our tight-binding calculations linked to Fermi statistics, show that the EC effect can be produced in trilayer graphene (TLG) structures connected to a heat source, triggered by changes in the electronic density of states (DOS) at the Fermi level when external gate fields are applied on the outer graphene layers. We demonstrate that entropy changes are sensitive to the stacking arrangement in TLG systems. The AAA-stacked TLG presents an inverse EC response (cooling) regardless of the temperature value and gate field potential strength, whereas the EC effect in ABC-stacked TLG remains direct (heating) above room temperature. We reveal otherwise the TLG with Bernal-ABA stacking generates both the direct and inverse EC response within the same sample, associated with gate-dependent electronic transitions of thermally excited charge carriers from the valence band to the conduction band in the band structure. The novel charge carrier electrocaloric effect we propose in quantum layered systems may bring a wide variety of prototype van der Waals materials that could be used as versatile platforms to controlling the thermal response in nanodevices.
format	article
author	Natalia Cortés Oscar Negrete Francisco J. Peña Patricio Vargas
author_facet	Natalia Cortés Oscar Negrete Francisco J. Peña Patricio Vargas
author_sort	Natalia Cortés
title	Gate-tunable charge carrier electrocaloric effect in trilayer graphene
title_short	Gate-tunable charge carrier electrocaloric effect in trilayer graphene
title_full	Gate-tunable charge carrier electrocaloric effect in trilayer graphene
title_fullStr	Gate-tunable charge carrier electrocaloric effect in trilayer graphene
title_full_unstemmed	Gate-tunable charge carrier electrocaloric effect in trilayer graphene
title_sort	gate-tunable charge carrier electrocaloric effect in trilayer graphene
publisher	Nature Portfolio
publishDate	2021
url	https://doaj.org/article/695909ff3cd3487c811eea22a3e67fee
work_keys_str_mv	AT nataliacortes gatetunablechargecarrierelectrocaloriceffectintrilayergraphene AT oscarnegrete gatetunablechargecarrierelectrocaloriceffectintrilayergraphene AT franciscojpena gatetunablechargecarrierelectrocaloriceffectintrilayergraphene AT patriciovargas gatetunablechargecarrierelectrocaloriceffectintrilayergraphene
_version_	1718429231108587520

Gate-tunable charge carrier electrocaloric effect in trilayer graphene

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