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Electron-electron interactions in the conductivity of graphene
A. A. Kozikov, A. K. Savchenko, B. N. Narozhny +1
The effect of electron-electron interaction on the low-temperature conductivity of graphene is investigated experimentally. Unlike in other two-dimensional systems, the electron-el…
Mesoscopic Fluctuations of Coulomb Drag of Composite Fermions
A. S. Price, A. K. Savchenko, D. A. Ritchie
We present the first experimental study of mesoscopic fluctuations of Coulomb drag in a system with two layers of composite fermions, which are seen when either the magnetic field…
Mesoscopic conductance fluctuations in graphene
D. W. Horsell, A. K. Savchenko, F. V. Tikhonenko +3
We study fluctuations of the conductance of micron-sized graphene devices as a function of the Fermi energy and magnetic field. The fluctuations are studied in combination with ana…
Quantum transport thermometry for electrons in graphene
K. Kechedzhi, D. W. Horsell, F. V. Tikhonenko +4
We propose a method of measuring the electron temperature in mesoscopic conductors and demonstrate experimentally its applicability to micron-size graphene devices in the lin…
Conductance of p-n-p graphene structures with 'air-bridge' top gates
R. V. Gorbachev, A. S. Mayorov, A. K. Savchenko +2
We have fabricated graphene devices with a top gate separated from the graphene layer by an air gap--a design which does not decrease the mobility of charge carriers under the gate…
Quantum interference in bilayer graphene
R. V. Gorbachev, F. V. Tikhonenko, A. S. Mayorov +2
We report the first experimental study of the quantum interference correction to the conductivity of bilayer graphene. Low-field, positive magnetoconductivity due to the weak local…
Weak localisation in graphene flakes
F. V. Tikhonenko, D. W. Horsell, R. V. Gorbachev +1
We show that the manifestation of quantum interference in graphene is very different from that in conventional two-dimensional systems. Due to the chiral nature of charge carriers,…
Giant Fluctuations of Coulomb Drag in a Bilayer System
A. S. Price, A. K. Savchenko, B. N. Narozhny +2
We have observed reproducible fluctuations of the Coulomb drag, both as a function of magnetic field and electron concentration, which are a manifestation of quantum interference o…
Spontaneous current generation in gated nanostructures
D. W. Horsell, A. K. Savchenko, Y. M. Galperin +3
We have observed an unusual dc current spontaneously generated in the conducting channel of a short-gated GaAs transistor. The magnitude and direction of this current critically de…
Shot Noise in Mesoscopic Transport Through Localised States
A. K. Savchenko, S. S. Safonov, S. H. Roshko +5
We show that shot noise can be used for studies of hopping and resonant tunnelling between localised electron states. In hopping via several states, shot noise is seen to be suppre…
Interactions in high-mobility 2D electron and hole systems
E. A. Galaktionov, A. K. Savchenko, S. S. Safonov +7
Electron-electron interactions mediated by impurities are studied in several high-mobility two-dimensional (electron and hole) systems where the parameter changes fr…
Enhanced shot noise in resonant tunnelling via interacting localised states
S. S. Safonov, A. K. Savchenko, D. A. Bagrets +4
In a variety of mesoscopic systems shot noise is seen to be suppressed in comparison with its Poisson value. In this work we observe a considerable enhancement of shot noise in the…
Anomalous state of a 2DEG in vicinal Si MOSFET in high magnetic fields
Z. D. Kvon, Y. Y. Proskuryakov, A. K. Savchenko
We report the observation of an anomalous state of a 2D electron gas near a vicinal surface of a silicon MOSFET in high magnetic fields. It is characterised by unusual behaviour of…
Linear in-plane magnetoconductance and spin susceptibility of a 2D electron gas on a vicinal silicon surface
Y. Y. Proskuryakov, Z. D. Kvon, A. K. Savchenko
In this work we have studied the parallel magnetoresistance of a 2DEG near a vicinal silicon surface. An unusual, linear magnetoconductance is observed in the fields up to …
Magnetoresistance of a 2D electron gas caused by electron interactions in the transition from the diffusive to the ballistic regime
L. Li, Y. Y. Proskuryakov, A. K. Savchenko +2
On a high-mobility 2D electron gas we have observed, in strong magnetic fields (omega_{c} tau > 1), a parabolic negative magnetoresistance caused by electron-electron interactions…
Hole-Hole Interaction Effect in the Conductance of the Two-Dimensional Hole Gas in the Ballistic Regime
Y. Y. Proskuryakov, A. K. Savchenko, S. S. Safonov +3
On a high mobility two-dimensional hole gas (2DHG) in a GaAs/GaAlAs heterostructure we study the interaction correction to the Drude conductivity in the ballistic regime, $k_BTτ/\h…
Modulation origin of 1/f noise in two-dimensional hopping
V. Pokrovskii, A. K. Savchenko, W. R. Tribe +1
We show that 1/f noise in a two-dimensional electron gas with hopping conduction can be explained by the modulation of conducting paths by fluctuating occupancy of non-conducting s…
Fermi-liquid behaviour of the low-density 2D hole gas in GaAs/AlGaAs heterostructure at large values of r_s
Y. Y. Proskuryakov, A. K. Savchenko, S. S. Safonov +3
We examine the validity of the Fermi-liquid description of the dilute 2D hole gas in the crossover from 'metallic'-to-'insulating' behaviour of R(T).It has been established that, a…
Metallic and insulating behaviour of the two-dimensional electron gas on a vicinal surface of Si MOSFETs
S. S. Safonov, S. H. Roshko, A. K. Savchenko +2
The resistance R of the 2DEG on the vicinal Si surface shows an unusual behaviour, which is very different from that in the (100) Si MOSFET where an unconventional metal to insulat…
Enhanced fluctuations of the tunneling density of states near bottoms of Landau bands measured by a local spectrometer
J. P. Holder, A. K. Savchenko, Vladimir I. Fal'ko +4
We have found that the local density of states fluctuations (LDOSF) in a disordered metal, detected using an impurity in the barrier as a spectrometer, undergo enhanced (with respe…
Effect of the angular momentum on the magnitude of the current in magneto-tunnelling spectroscopy of quantum dots
B. Jouault, J. P. Holder, M. Boero +5
We present an experimental and theoretical study of electron tunnelling through quantum dots which focusses the attention on the amplitude of the current peaks as a function of mag…
Resonant Tunneling Spectroscopy of Interacting Localised States -- Observation of the Correlated Current Through Two Impurities
V. V. Kuznetsov, A. K. Savchenko, D. R. Mace +2
We study effects of Coulomb interactions between localised states in a potential barrier by measuring resonant-tunneling spectra with a small bias applied along the barrier. In the…