Enhanced electron-phonon coupling at the Au/Mo(112) surface

Fukutani, Keisuke; Hayashi, Hirokazu; Yakovkin, I.N.; Habuchi, Takafumi; Hirayama, Daisuke; Jiang, Jian; Iwasawa, Hideaki; Shimada, Kenya; Losovyj, Ya. B.; Dowben, Peter A.

doi:10.1103/physrevb.86.205432

Cited by 6 publications

(4 citation statements)

References 40 publications

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“…In further support of this interpretation, we performed scanning tunneling microscopy imaging of comparable gold coverages on cleaved (bulk) MoS 2 surfaces and find the formation of highly dispersed small islands . Prior vibrational spectroscopy also suggests strong mechanical attachment in this material system …”

Section: Resultsmentioning

confidence: 85%

“…48 Prior vibrational spectroscopy also suggests strong mechanical attachment in this material system. 49 ■ DISCUSSION DFT modeling of the total density of states of gold aggregates of different sizes and shapes on a single layer thick sheet of MoS 2 provides insight into the strength of the Au-MoS 2 interaction at the root of the high dispersion and absence of aggregation. Figure 2b shows the Au 5d DOS of an individual gold atom as well as two flat and one bilayer gold clusters on MoS 2 .…”

Section: ■ Resultsmentioning

confidence: 99%

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Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂

Merida

Echeverría

et al. 2017

J. Phys. Chem. C

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Gold islands are typically associated with high binding affinity to adsorbates and catalytic activity. Here we present the growth of dispersed nanoscale gold islands on single layer MoS 2 , prepared on an inert SiO 2 /Si support by chemical vapor deposition (CVD). This study offers a combination of growth process development, optical characterization, photoelectron spectroscopy at sub-micron spatial resolution, and advanced density functional theory modeling for detailed insight into the electronic interaction between gold and single-layer MoS 2. In particular, we find the gold density of states in Au/MoS 2 /SiO 2 /Si to be far less well-defined than Au islands on other 2-dimensional materials such as graphene, for which we also provide data. We attribute this effect to the presence of heterogeneous Au adatom/MoS 2-support interactions within the nanometer-scale gold cluster. Theory predicts that CO will exhibit adsorption energies in excess of 1 eV at the Au cluster edges, where the local density of states is dominated by Au 5d z 2 symmetry.

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Section: Resultsmentioning

confidence: 85%

Section: ■ Resultsmentioning

confidence: 99%

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂

Merida

Echeverría

et al. 2017

J. Phys. Chem. C

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“…Although our model reproduces the data and slow saturation relatively well, it appears that the value of g for Cr of 0.42 × 10 18 Wm −3 K −1 is smaller than what the thickness trend would suggest, and an increased value of 10 18 Wm −3 K −1 would fit better. While this is larger than the reported values in the literature, other effects may contribute to increasing g, such as interfacial contributions with the Au [40] or the oxide [41]. To further illustrate the effect of g, we plot in figure 8 the evolution of G in the Al/sapphire system.…”

Section: Role Of the Electron-phonon Coupling Constant In The Interlayermentioning

confidence: 86%

Role of the electron–phonon coupling in tuning the thermal boundary conductance at metal-dielectric interfaces by inserting ultrathin metal interlayers

Oommen

Pisana

2020

J. Phys.: Condens. Matter

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Varying the thermal boundary conductance at metal-dielectric interfaces is of great importance for highly integrated electronic structures such as electronic, thermoelectric and plasmonic devices where heat dissipation is dominated by interfacial effects. In this paper we study the modification of the thermal boundary conductance at metal-dielectric interfaces by inserting metal interlayers of varying thickness below 10 nm. We show that the insertion of a tantalum interlayer at the Al/Si and Al/sapphire interfaces strongly hinders the phonon transmission across these boundaries, with a sharp transition and plateau within ~1 nm. We show that the electron-phonon coupling has a major influence on the sharpness of the transition as the interlayer thickness is varied, and if the coupling is strong, the variation in thermal boundary conductance typically saturates within 2 nm. In contrast, the addition of a nickel interlayer at the Al/Si and the Al/sapphire interfaces produces a local minimum as the interlayer thickness increases, due to a more similar phonon dispersion between Ni and Al. The weaker electron-phonon coupling in Ni causes the boundary conductance to saturate more slowly. Thermal property measurements were performed using time domain thermo-reflectance and are in good agreement with a formulation of the diffuse mismatch model based on real phonon dispersions that accounts for inelastic phonon scattering and phonon confinement within the interlayer. The analysis of the different assumptions included in the model reveals when inelastic processes should be considered.

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“…The high-resolution polarization-and photon-energy-dependent ARPES was performed at the linear undulator beamline (BL-1) [17] of the Hiroshima Synchrotron Radiation Center (HiSOR) at Hiroshima University, Japan. The surfaces of Mo(1 1 2) crystals were cleaned by the standard method of repeated annealing (at ~1400°C) in an oxygen atmosphere with an oxygen partial pressure of ~1 × 10 -8 Torr, followed by cycles of annealing at 1000-1300 °C and flashing at ~1800°C, similar to the procedures used elsewhere [18][19][20][21][22][23][24]. Low-energy electron diffraction (LEED) and Auger electron spectroscopy (AES) were used to verify the quality of the Mo(1 1 2) surface.…”

Section: Methodsmentioning

confidence: 99%

Symmetry-protected surface state on Mo(1 1 2)

Fukutani

Hayashi

Scott

et al. 2014

J. Phys.: Condens. Matter

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We report the experimental identification of a symmetry-protected surface state on Mo(1 1 2). The utilization of photon-energy- and polarization-dependent angle-resolved photoemission spectroscopy clearly demonstrates that this true surface state preserves its two-dimensional character despite the fact that it resides within the projection of the bulk bands along the ̅Γ-̅X line of the surface Brillouin zone. This surface state on Mo(1 1 2) exists due to the forbidden hybridization between the bulk and the surface states, each of which possesses different state symmetries within the crystal. The experimental identification of such a surface state possibly opens up pathways towards controlled manipulation between true surface states and the surface resonances (i.e. between two-dimensional and quasi-two-dimensional states) by breaking the symmetry of the crystal surface.

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Enhanced electron-phonon coupling at the Au/Mo(112) surface

Abstract: A detailed investigation of the electronic structure and electron-phonon coupling for Au monolayers on the Mo (112)

Cited by 6 publications

References 40 publications

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂

Role of the electron–phonon coupling in tuning the thermal boundary conductance at metal-dielectric interfaces by inserting ultrathin metal interlayers

Symmetry-protected surface state on Mo(1 1 2)

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Enhanced electron-phonon coupling at the Au/Mo(112) surface

Abstract: A detailed investigation of the electronic structure and electron-phonon coupling for Au monolayers on the Mo (112)

Cited by 6 publications

References 40 publications

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS2

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS2

Role of the electron–phonon coupling in tuning the thermal boundary conductance at metal-dielectric interfaces by inserting ultrathin metal interlayers

Symmetry-protected surface state on Mo(1 1 2)

Contact Info

Product

Resources

About

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂

Gold Dispersion and Activation on the Basal Plane of Single-Layer MoS₂