Tunable carrier multiplication and cooling in graphene

J.C. Johannsen; S. Ulstrup; A. Crepaldi; F. Cilento; M. Zacchigna; J.A. Miwa; C. Cacho; R.T. Chapman; E. Springate; F. Fromm; C. Raidel; T. Seyller; Phil King; F. Parmigiani; M. Grioni; P. Hofmann

doi:10.1021/nl503614v

Tunable carrier multiplication and cooling in graphene

J.C. Johannsen, S. Ulstrup, A. Crepaldi, F. Cilento, M. Zacchigna, J.A. Miwa, C. Cacho, R.T. Chapman, E. Springate, F. Fromm, C. Raidel, T. Seyller, Phil King, F. Parmigiani, M. Grioni, P. Hofmann

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

Abstract

Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less (p-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.

Original language	English
Pages (from-to)	326-331
Number of pages	6
Journal	Nano Letters
Volume	15
Issue number	1
Early online date	2 Dec 2014
DOIs	https://doi.org/10.1021/nl503614v
Publication status	Published - 14 Jan 2015

Keywords

Epitaxial graphene
Hot carrier dynamics
Charge carrier tunability
Carrier multiplication
Time-resolved ARPES

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10.1021/nl503614v

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Copyright © 2014 American Chemical Society. This document is the Accepted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://dx.doi.org/10.1021/nl503614v
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Cite this

@article{18f4eb23b05b413686bcb9d76f8e1744,

title = "Tunable carrier multiplication and cooling in graphene",

abstract = "Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less (p-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.",

keywords = "Epitaxial graphene, Hot carrier dynamics, Charge carrier tunability, Carrier multiplication, Time-resolved ARPES",

author = "J.C. Johannsen and S. Ulstrup and A. Crepaldi and F. Cilento and M. Zacchigna and J.A. Miwa and C. Cacho and R.T. Chapman and E. Springate and F. Fromm and C. Raidel and T. Seyller and Phil King and F. Parmigiani and M. Grioni and P. Hofmann",

note = "The authors acknowledge financial support from the VILLUM foundation, The Danish Council for Independent Research, the Lundbeck Foundation, the Swiss National Science Foundation (NSF), EPSRC, The Royal Society and the Italian Ministry of University and Research (Grants No. FIRBRBAP045JF2 and No. FIRB-RBAP06AWK3).",

year = "2015",

month = jan,

day = "14",

doi = "10.1021/nl503614v",

language = "English",

volume = "15",

pages = "326--331",

journal = "Nano Letters",

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TY - JOUR

T1 - Tunable carrier multiplication and cooling in graphene

AU - Johannsen, J.C.

AU - Ulstrup, S.

AU - Crepaldi, A.

AU - Cilento, F.

AU - Zacchigna, M.

AU - Miwa, J.A.

AU - Cacho, C.

AU - Chapman, R.T.

AU - Springate, E.

AU - Fromm, F.

AU - Raidel, C.

AU - Seyller, T.

AU - King, Phil

AU - Parmigiani, F.

AU - Grioni, M.

AU - Hofmann, P.

N1 - The authors acknowledge financial support from the VILLUM foundation, The Danish Council for Independent Research, the Lundbeck Foundation, the Swiss National Science Foundation (NSF), EPSRC, The Royal Society and the Italian Ministry of University and Research (Grants No. FIRBRBAP045JF2 and No. FIRB-RBAP06AWK3).

PY - 2015/1/14

Y1 - 2015/1/14

N2 - Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less (p-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.

AB - Time- and angle-resolved photoemission measurements on two doped graphene samples displaying different doping levels reveal remarkable differences in the ultrafast dynamics of the hot carriers in the Dirac cone. In the more strongly (n-)doped graphene, we observe larger carrier multiplication factors (>3) and a significantly faster phonon-mediated cooling of the carriers back to equilibrium compared to in the less (p-)doped graphene. These results suggest that a careful tuning of the doping level allows for an effective manipulation of graphene's dynamical response to a photoexcitation.

KW - Epitaxial graphene

KW - Hot carrier dynamics

KW - Charge carrier tunability

KW - Carrier multiplication

KW - Time-resolved ARPES

UR - http://pubs.acs.org/doi/suppl/10.1021/nl503614v

U2 - 10.1021/nl503614v

DO - 10.1021/nl503614v

M3 - Article

C2 - 25458168

AN - SCOPUS:84920991881

SN - 1530-6984

VL - 15

SP - 326

EP - 331

JO - Nano Letters

JF - Nano Letters

IS - 1

ER -

Tunable carrier multiplication and cooling in graphene

Abstract

Keywords

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Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

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Tunable carrier multiplication and cooling in graphene

Abstract

Keywords

Access to Document

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Projects

Royal Society Research Fellowship: Electronic structure engineering of novel topological phases

Topological Protection and NonEquilibriu: Topological Protection and NonEquilibrium States in Strongly Correlated Electron Systems

Cite this