2018
DOI: 10.1021/acs.jpclett.8b00234
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Observation of Nanosecond Hot Carrier Decay in Graphene

Abstract: An extremely long decay time of hot carriers in graphene at room temperature was observed for the first time by monitoring the photoinduced thermionic emission using a highly sensitive time-of-flight angle-resolved photoemission spectroscopy method. The emission persisted beyond 1 ns, two orders of magnitude longer than previously reported carrier decay. The long lifetime was attributed to the excitation of image potential states at very low laser fluencies.

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Cited by 7 publications
(8 citation statements)
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References 48 publications
(71 reference statements)
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“…The details of the setup have been described in previous experiments. Here, we briefly describe modifications to the original instrumentation. For sample preparation, 2,5-Dihydroxybenzoic Acid (98%, Sigma-Aldrich) was prepared in a solution of 50:50 water/acetonitrile.…”
Section: Methodsmentioning
confidence: 99%
See 2 more Smart Citations
“…The details of the setup have been described in previous experiments. Here, we briefly describe modifications to the original instrumentation. For sample preparation, 2,5-Dihydroxybenzoic Acid (98%, Sigma-Aldrich) was prepared in a solution of 50:50 water/acetonitrile.…”
Section: Methodsmentioning
confidence: 99%
“…Recently, Li and coworkers have developed a 3D momentum imaging system to probe the surface decay dynamics of hot carriers in graphene. 29 The 3D momentum distributions of electrons emitted from the surface provided evidence of delayed photoemission. Conceptually, the same technique can be applied to study the laser desorption/ionization process by measuring the 3D momentum distributions of desorbed ions.…”
Section: ■ Introductionmentioning
confidence: 99%
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“…7,8 Carrier− carrier relaxation has been investigated in some detail, and there is agreement that it occurs on ultrafast (sub-ps) timescales. 9,10 While there are also a number of studies concerned with the relaxation into optical phonon modes, 11,12 there are few studies on the relaxation dynamics of welldefined vibrational modes.…”
Section: Introductionmentioning
confidence: 99%
“…Graphene has been in the limelight for almost two decades now, mainly due to its many unusual properties. , Among these properties is the almost ballistic speed with which electrons move through graphene, making it an almost perfect choice for electronic applications and devices. , Electronic excitations in graphene can relax through two competing mechanisms on ultrafast timescales, namely, carrier–carrier and carrier–phonon relaxation. , Carrier–carrier relaxation has been investigated in some detail, and there is agreement that it occurs on ultrafast (sub-ps) timescales. , While there are also a number of studies concerned with the relaxation into optical phonon modes, , there are few studies on the relaxation dynamics of well-defined vibrational modes.…”
Section: Introductionmentioning
confidence: 99%