Tunable graphene system with two decoupled monolayers

Schmidt, Hennrik; Lüdtke, T.; Barthold, P.; McCann, Edward; Haug, Rolf J.

doi:10.1063/1.3012369

Cited by 107 publications

(118 citation statements)

References 15 publications

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“…This interlayer capacitance has been applied in previous studies on twisted bilayer graphene [38][39][40] . Here we estimate this interlayer capacitance C in B25.3 mF cm À 2 with the interlayer dielectric constant B10e 0 and interlayer spacing B0.35 nm 38,40 .…”

Section: Mos 2 Vertical Heterostructural Capacitance Devicesmentioning

confidence: 99%

Probing the electron states and metal-insulator transition mechanisms in molybdenum disulphide vertical heterostructures

et al. 2015

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The metal-insulator transition is one of the remarkable electrical properties of atomically thin molybdenum disulphide. Although the theory of electron-electron interactions has been used in modelling the metal-insulator transition in molybdenum disulphide, the underlying mechanism and detailed transition process still remain largely unexplored. Here we demonstrate that the vertical metal-insulator-semiconductor heterostructures built from atomically thin molybdenum disulphide are ideal capacitor structures for probing the electron states. The vertical configuration offers the added advantage of eliminating the influence of large impedance at the band tails and allows the observation of fully excited electron states near the surface of molybdenum disulphide over a wide excitation frequency and temperature range. By combining capacitance and transport measurements, we have observed a percolation-type metal-insulator transition, driven by density inhomogeneities of electron states, in monolayer and multilayer molybdenum disulphide. In addition, the valence band of thin molybdenum disulphide layers and their intrinsic properties are accessed.

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Section: Mos 2 Vertical Heterostructural Capacitance Devicesmentioning

confidence: 99%

Probing the electron states and metal-insulator transition mechanisms in molybdenum disulphide vertical heterostructures

et al. 2015

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“…Surprisingly, experimental work over the last five years has revealed a family of multilayer graphenes that show only weak (if any) effects of their interlayer coupling. This family includes graphenes that are grown epitaxially on the SiC (0001) surface [8,9,10], CVD grown graphenes [11] and some forms of exfoliated graphene [12,13,14]. A common structural attribute of these systems is a rotational misorientation (a twist) of their neighboring layers at angles of θ = nπ/3.…”

Section: Introductionmentioning

confidence: 99%

Interlayer coupling in rotationally faulted multilayer graphenes

Mele¹

2012

J. Phys. D: Appl. Phys.

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“…Substantial efforts have been directed towards the investigation of the linear response of doped graphene 24 and of the charge density excitations [25][26][27][28][29] and of such complex quasiparticles as plasmarons 30,31 and plasmon-phonon complexes 32 . Recently, the experimental realization of graphene double-layer structures coupled only via the Coulomb interaction [33][34][35][36][37][38] has attracted substantial theoretical interest in studying the double-layer plasmon effects [39][40][41][42] and the frictional drag 43 in two spatially separated graphene layers [44][45][46][47][48][49][50][51][52] as powerful tools for probing interaction effects of massless Dirac fermions.…”

Section: Introductionmentioning

confidence: 99%

Plasmonic excitations in Coulomb-coupledN-layer graphene structures

2013

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We study Dirac plasmons and their damping in spatially separated N -layer graphene structures at finite doping and temperatures. The plasmon spectrum consists of one optical excitation with a square-root dispersion and N − 1 acoustical excitations with linear dispersions, which are undamped at zero temperature within a triangular energy region outside the electron-hole continuum. For any finite number of graphene layers we have found that the energy and weight of the optical plasmon increase in the long wavelength limit, respectively, as square-root and linear functions of N . This is in agreement with recent experimental findings. With an increase of the number of multilayer acoustical plasmon modes, the energy and weight of the upper lying branches also exhibit an enhancement with N . This increase is strongest for the uppermost acoustical mode so that its energy can exceed at some value of momentum the plasmon energy in an individual graphene sheet. Meanwhile, the energy of the low lying acoustical branches decreases weakly with N as compared with the single acoustical mode in double-layer graphene structures. Our numerical calculations provide a detailed understanding of the overall behavior of the wave vector dependence of the optical and acoustical multilayer plasmon modes and show how their dispersion and damping are modified as a function of temperature, interlayer spacing, and inlayer carrier density in (un)balanced graphene multilayer structures.

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Tunable graphene system with two decoupled monolayers

Cited by 107 publications

References 15 publications

Probing the electron states and metal-insulator transition mechanisms in molybdenum disulphide vertical heterostructures

Probing the electron states and metal-insulator transition mechanisms in molybdenum disulphide vertical heterostructures

Interlayer coupling in rotationally faulted multilayer graphenes

Plasmonic excitations in Coulomb-coupledN-layer graphene structures

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