Superconductivity of electron–hole pairs in a bilayer graphene system in a quantizing magnetic field

Fil, D. V.; Kravchenko, L. Yu.

doi:10.1063/1.3224730

Cited by 11 publications

(18 citation statements)

References 45 publications

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“…Exciton condensation in graphene has attracted considerable theoretical attention (Abergel et al, 2013;Aleiner et al, 2007;Efimkin and Lozovik, 2011;Fil and Kravchenko, 2009;Efetov, 2008, 2010;Lozovik et al, 2012;Lozovik and Sokolik, 2008;Min et al, 2008;Pikalov and Fil, 2012;Sodemann et al, 2012;Suprunenko et al, 2012;Zhang and Joglekar, 2008). Several contradicting values of the transition temperature in double-layer graphene systems have been reported.…”

Section: B Interlayer Exciton Formationmentioning

confidence: 99%

Coulomb drag

2016

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Coulomb drag is a transport phenomenon whereby long-range Coulomb interaction between charge carriers in two closely spaced but electrically isolated conductors induces a voltage (or, in a closed circuit, a current) in one of the conductors when an electrical current is passed through the other. The magnitude of the effect depends on the exact nature of the charge carriers and microscopic, many-body structure of the electronic systems in the two conductors. Drag measurements have become part of the standard toolbox in condensed matter physics that can be used to study fundamental properties of diverse physical systems including semiconductor heterostructures, graphene, quantum wires, quantum dots, and optical cavities.

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Section: B Interlayer Exciton Formationmentioning

confidence: 99%

Coulomb drag

2016

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“…At d > d c the collective mode frequency in a certain range of wave vectors becomes imaginary, that corresponds to instability of the state with pairing. The magnitude of d c grows with increasing the imbalance [18]. Increasing the imbalance leads to decreasing the superfluid density n s , i. e. the increase of d c can be linked to the decrease of n s .…”

Section: Introductionmentioning

confidence: 99%

“…Quite recently a suggestion has been made to use graphene layers as components of bilayer systems [14][15][16][17][18]. Further investigations revealed that a serious problem in this case is screening of Coulomb interaction between the electron and the hole [19,20].…”

Section: Introductionmentioning

confidence: 99%

Superfluidity of a dilute gas of electron-hole pairs in a bilayer system

Fil

Shevchenko

2016

Low Temperature Physics

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The conditions of stability of the superfluid phase in double layer systems with pairing of spatially separated electrons and holes in the low density limit are studied. The general expression for the collective excitation spectrum is obtained. It is shown that under increase in the distance d between the layers the minimum emerges in the excitation spectrum. When d reaches the critical value the superfluid state becomes unstable relative to the formation of a kind of the Wigner crystal state. The same instability occurs at fixed d under increase in the density of carries. It is established that the critical distance and the critical density are related to each other by the inverse power function. The impact of the impurities on the temperature of the superfluid transition is investigated. The impact is found weak at the impurity concentration smaller than the density of the pairs. It is shown that in the rarefied system the critical temperature Tc ≈ 100 K can be reached.

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“…The critical density n v,c is proportional to ρ 2 s . It is known that the mean-field approximation overestimates the superfluid stiffness ρ s : it does not take into account quantum and thermal excitations, and the interaction with impurities that reduce the superfluid stiffness (see, for instance, [28][29][30]). Therefore, the actual critical density can be considerable smaller.…”

Section: Vortices In Exciton Superfluids In Quantum Hall Bilayersmentioning

confidence: 99%

Transport properties of quantum Hall bilayers. Phenomenological description

Fil

Shevchenko

2010

Physics Letters A

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We propose a phenomenological model that describes counterflow and drag experiments with quantum Hall bilayers in a ν T = 1 state. We consider the system consisting of statistically distributed areas with local total filling factors ν T 1 > 1 and ν T 2 < 1. The excess or deficit of electrons in a given area results in an appearance of vortex excitations. The vortices in quantum Hall bilayers are charged. They are responsible for a decay of the exciton supercurrent, and, at the same time, contribute to the conductivity directly. The experimental temperature dependence of the counterflow and drive resistivities is described under accounting viscous forces applied to vortices that are the exponentially increase functions of the inverse temperature. The presence of defect areas where the interlayer phase coherence is destroyed completely can result in an essential negative longitudinal drag resistivity as well as in a counterflow Hall resistivity.

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Superconductivity of electron–hole pairs in a bilayer graphene system in a quantizing magnetic field

Cited by 11 publications

References 45 publications

Coulomb drag

Coulomb drag

Superfluidity of a dilute gas of electron-hole pairs in a bilayer system

Transport properties of quantum Hall bilayers. Phenomenological description

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