Activated Transport in the Separate Layers that Form the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>ν</mml:mi><mml:mi>T</mml:mi></mml:msub><mml:mo>=</mml:mo><mml:mn>1</mml:mn></mml:math>Exciton Condensate

Wiersma, R; Lok, J. G. S.; Kraus, S.; Dietsche, W.; Klitzing, K. von; Schuh, Dieter; Bichler, Max; Tranitz, Hans-Peter; Wegscheider, Werner

doi:10.1103/physrevlett.93.266805

Cited by 127 publications

(155 citation statements)

References 18 publications

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“…In the well-known language in which layer index is taken as pseudospin, the state is an easy-plane ferromagnet, and has carrier wave functions coherently distributed between the two layers. Imbalance 18,19 , or unequal density for the two layers has been shown 18 to strengthen the excitonic condensate state for moderate imbalance.…”

Section: Introductionmentioning

confidence: 99%

Unequal layer densities in bilayer Wigner crystal at high magnetic fields

et al. 2012

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We report studies of pinning mode resonances of magnetic field induced bilayer Wigner crystals of bilayer hole samples with negligible interlayer tunneling and different interlayer separations d, in states with varying layer densities, including unequal layer densities. With unequal layer densities, samples with large d relative to the in-plane carrier-carrier spacing a, two pinning resonances are present, one for each layer. For small d/a samples, a single resonance is observed even with significant density imbalance. These samples, at balance, were shown to exhibit an enhanced pinning mode frequency [Zhihai Wang et al., Phys. Rev. Lett. 136804 (2007)], which was ascribed to a onecomponent, pseudospin ferromagnetic Wigner solid. The evolution of the resonance frequency and line width indicates the quantum interlayer coherence survives at moderate density imbalance, but disappears when imbalance is sufficiently large.

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Section: Introductionmentioning

confidence: 99%

Unequal layer densities in bilayer Wigner crystal at high magnetic fields

et al. 2012

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“…1 While the nature of these two limiting states is reasonably well understood, the nature of the states at intermediate d is less understood and has been an active topic of both theoretical 3,5,6,7,8,9,10,11,12,13,14,15,16 and experimental interest. 17,18,19,20,21,22,23,24,25,26,27 Although there are many interesting questions remaining that involve more complicated experimental situations, within the current work we always consider a zero temperature bilayer system with zero tunnelling between the two layers and no disorder. Furthermore, we only consider the situation of ν = 1 2 + 1 2 where the electron density in each layer is such that n 1 = n 2 = B/(2φ 0 ) with φ 0 = hc/e the flux quantum and B the magnetic field.…”

Section: Introductionmentioning

confidence: 99%

Trial wave functions forν=12+12quantum Hall bilayers

Möller¹,

Simon²,

Rezayi

2009

Phys. Rev. B

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Quantum Hall bilayer systems at filling fractions near ν = 1 2 + 1 2 undergo a transition from a compressible phase with strong intralayer correlation to an incompressible phase with strong interlayer correlations as the layer separation d is reduced below some critical value. Deep in the intralayer phase (large separation) the system can be interpreted as a fluid of composite fermions (CFs), whereas deep in the interlayer phase (small separation) the system can be interpreted as a fluid of composite bosons (CBs). The focus of this paper is to understand the states that occur for intermediate layer separation by using trial variational wavefunctions. We consider two main classes of wavefunctions. In the first class, previously introduced in Möller et al. (2003)] and generalizes the idea of pairing wavefunctions by allowing the CFs also to be replaced continuously by CBs. This generalization allows us to construct exceedingly good wavefunctions for interlayer spacings of d ℓ 0 , as well. The accuracy of the wavefunctions discussed in this work, compared with exact diagonalization, approaches that of the celebrated Laughlin wavefunction.

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“…The effect has obtained rather convincing experimental confirmation. Observation of vanishing Hall resistance and a sharp increase of longitudinal conductivity at low temperature under a flow of equal by magnitude and oppositely directed currents in the layers [8][9][10] can be considered as a direct evidence of the pairing. Another confirmation is an observable peak in differential interlayer conductivity at zero potential difference [11,12].…”

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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Activated Transport in the Separate Layers that Form theνT=1Exciton Condensate

Cited by 127 publications

References 18 publications

Unequal layer densities in bilayer Wigner crystal at high magnetic fields

Unequal layer densities in bilayer Wigner crystal at high magnetic fields

Trial wave functions forν=12+12quantum Hall bilayers

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

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