Electron-Phonon Decoupling in Disordered Insulators

Ovadia, M.; Sacépé, Benjamin; Shahar, D.

doi:10.1103/physrevlett.102.176802

Cited by 99 publications

(131 citation statements)

References 23 publications

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“…In the case described in [15][16] this is the superconductor -insulator transition near the critical temperature. In Ref.…”

Section: Suchmentioning

confidence: 99%

Field-effect switching in nano-graphite films

Lebedev¹

2014

Journal of Physics and Chemistry of Solids

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The effect of electrical resistivity switching in nano -graphite films is described. In difference with cases published elsewhere the switching in nano -graphite films occurs from stable high conductive to metastable low conductive state. Critical current of switching varies in the range 0.01-0.5A and can be increased up to values appropriate for using of nano -graphite samples in power grids as contact-less current limiters and circuit breakers. The possible mechanisms of switching phenomenon in nano -graphite films are discussed.Physical and electromagnetic properties of the carbon and its derivatives are the subjects of constant interest and extensive studies for many years. Attention has been paid to the switching behavior in the carbon graphite like materials. K. Antonowicz more than 30 years ago investigated the conductive properties of the glassy carbon [1] and its evaporated deposits [2] and has found out the effect of jump of conductivity up to three orders of magnitude. The change of conductivity was reversible, and the relaxation time made some days.B.Z.Jang and L.Zhao also studied the switching behavior of carbonized materials [3]. They study the partially carbonized polyacrylnitride fibbers, which were observed to undergo a resistivity change between 2 and 4 orders of magnitude at a transition temperature typically in the range of 98°C to 200°C. The current-voltage curves exhibited an initial supercurrent-like increase, followed by a rapid drop to a high resistance state, and then a rise in current

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“…In the case described in [15][16] this is the superconductor -insulator transition near the critical temperature. In Ref.…”

Section: Suchmentioning

confidence: 99%

Field-effect switching in nano-graphite films

Lebedev¹

2014

Journal of Physics and Chemistry of Solids

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“…Abrupt conductance changes have been previously observed in a wide variety of experimental systems resulting from correlated [17][18] or nonequilibrium [19] physics. In particular, for strongly temperature dependent systems, thermal runaway can cause dramatic increases in the conductivity as the source drain bias is increased [19].…”

mentioning

confidence: 99%

Electric-field-driven insulating-to-conducting transition in a mesoscopic quantum dot lattice

Staley¹,

Ray²,

Kastner³

et al. 2014

Phys. Rev. B

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We investigate electron transport through a finite two dimensional mesoscopic periodic potential, consisting of an array of lateral quantum dots with electron density controlled by a global top gate. We observe a transition from an insulating state at low-bias voltages to a conducting state at high-bias voltages. The insulating state shows simply activated temperature dependence, with strongly gate voltage dependent activation energy. At low temperatures the transition between the insulating and conducting states becomes very abrupt and shows strong hysteresis. The high-bias behavior suggests underdamped transport through a periodic washboard potential resulting from collective motion. There has been great interest in understanding the motion of charge carriers in artificial periodic potentials with mesoscopic periods [1][2][3]. In particular, one might better understand transport in general by controlling the energy scales of importance: for quantum transport in such systems the important energies are the on-site excitation and Coulomb charging energies and the intersite tunneling matrix element. Control of these energies has been demonstrated in single lateral quantum dots connected by tunneling to leads, leading to insights into the Kondo effect [4], for example; similar insights into the Hubbard model might emerge from experiments on arrays of lateral quantum dots [5][6][7]. For classical transport modeled as charge diffusion through a tilted washboard potential, applicable to a wide variety of experimental systems [8][9][10], the energy scale is the height of the potential barrier between sites. In addition to the general question of whether quantum or classical transport dominates, artificial periodic potentials may provide insights into the extensive work on self-assembled arrays of semiconductor nanocrystals useful for optoelectronic devices [11,12].Many years ago, Duruöz et al. reported switching and hysteresis in an array of 200 × 200 lateral quantum dots in GaAs/AlGaAs heterostructures [13]. Subsequent experiments have been unable to reproduce these effects [14,15], raising the possibility that the observed hysteresis results from the leakeage current between the gate and dots observed by Duruöz et al. In this paper we report detailed measurements of the current through a 10 × 10 array of lateral quantum dots with a period of 340 nm. Like Duruöz et al., we find a hysteretic transition from a high resistance state at low bias to a low resistance state at high bias which is strongly tuned by magnetic field. Unlike previous measurements our devices have immeasurably small leakage between the gate and the dot array. We have studied the temperature, magnetic field, and gate-voltage (V g ) dependence of the transition in great detail. We find evidence that the important energy scale for transport within the high-resistance state is the barrier height between quantum dots. However, the low-resistance * nstaley@mit.edu state is quite unusual. While some of the features we observe are predicted by the simulati...

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“…. , n, with κ e−ph being the electron-phonon interaction constant and k being integer 4, 5 or 6 depending on the particular electronphonon interaction model [1,39,40]. For small bias, Q (i) is also small leading to the condition, T i (V ) ≈ T bath for all grains, i.…”

Section: Model Calculationmentioning

confidence: 99%

“…"Hot" electron-hole pairs generated in the grains by the inelastic cotunneling process drive electrons in the grains away from equilibrium state while electron-electron and electron-phonon interactions in the grains do the opposite: they thermalize electron distribution. Many experiments on granular systems in the inelastic cotunneling regime [4,39] show that the effective temperature approximation for electrons [1] in the grains (Fermi distribution with effective temperature) describes well the transport measurements in nearly whole range of the phonon bath temperatures T bath and driving biases V (except the case of ultralow bath temperatures and very high biases). In our consideration above we assume that the grain temperature is the effective electron temperature, T i (V ), which is found by solving the heat balance equations.…”

Section: Model Calculationmentioning

confidence: 99%