Intrinsic Gap and Exciton Condensation in 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>Bilayer System

Giudici, P.; Muraki, K.; Kumada, N.; Fujisawa, Toshimasa

doi:10.1103/physrevlett.104.056802

Cited by 23 publications

(21 citation statements)

References 30 publications

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“…Whether we have a case for a second-order transition in each of our two examples we cannot claim. However, this scenario will likely lead to the observance of smooth transitions into Fermi liquids in experiments as found in [22,23] in the case of the 111 excitonic, correlated state. As we pointed out in the 331 case by changing the distance between layers, that is, fixing a parameter for the transition driven by tunneling, Pfaffian may indeed become a ground state in the place of the Fermi liquid state [4].…”

Section: Conclusion and Discussionmentioning

confidence: 99%

-Wave Pairing in Quantum Hall Bilayers

Papić

Milovanović

2011

Advances in Condensed Matter Physics

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We show that the wave functions that describe the ground states of putative -wave-paired phases in quantum Hall bilayers, like the Pfaffian at or the paired phase at , are more likely to describe the excited states of Fermi liquids at these filling factors. We point out to the close competition between Fermi liquid and paired phases, which leads to the conclusion that in the experiments only direct transitions from the correlated 111 and 331 states into Fermi liquid(s) are likely to be observed.

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Section: Conclusion and Discussionmentioning

confidence: 99%

-Wave Pairing in Quantum Hall Bilayers

Papić

Milovanović

2011

Advances in Condensed Matter Physics

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“…[16][17][18][19][20][21] Although we understand well both the coherent phase at d / l → 0 and the composite Fermi-liquid state at d / l → ϱ, the transition between them has been shrouded in mystery. There have been many experimental [22][23][24][25][26][27][28][29][30][31][32][33][34][35] and theoretical [36][37][38][39][40][41][42][43][44][45][46][47][48] studies regarding the nature of this transition. While some of these theoretical works point to a direct transition between the two limiting phases, either continuous 45 or of first order, 42,43 some other works predict the existence of various types of exotic intermediate phases, including translational symmetry broken phase, [36][37][38]46 composite-fermion paired state, 39,40,47 phase of coexisting composite fermions and composite bosons, 44,48,…”

Section: Introductionmentioning

confidence: 99%

Clausius-Clapeyron relations for first-order phase transitions in bilayer quantum Hall systems

et al. 2010

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A bilayer system of two-dimensional electron gases in a perpendicular magnetic field exhibits rich phenomena. At total filling factor tot = 1, as one increases the layer separation, the bilayer system goes from an interlayer-coherent exciton condensed state to an incoherent phase of, most likely, two decoupled compositefermion Fermi liquids. Many questions still remain as to the nature of the transition between these two phases. Recent experiments have demonstrated that spin plays an important role in this transition. Assuming that there is a direct first-order transition between the spin-polarized interlayer-coherent quantum Hall state and spin partially polarized composite Fermi-liquid state, we calculate the phase boundary ͑d / l͒ c as a function of parallel magnetic field, NMR/heat pulse, temperature, and density imbalance, and compare with experimental results. Remarkably good agreement is found between theory and various experiments.

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“…These oscillations are signatures of a competition between the PFM and PPM phases with a frequency consistent with the AC Josephson frequency proportional to e(V − V c )/h 41;42 (See supplementary 46 for the numerical confirmation of the frequency dependence). Its maximum value is limited by excitonic gap size which corresponds to a frequency of 16.7 GHz, using experimentally measured value of gap 43 . The coherence between the layers triggers an electron current in the top layer and an equivalent hole current flow in the bottom layer.…”

Section: Numerical Results Of Time-dependent Non-equilibrium Dynmentioning

confidence: 99%

Voltage-induced dynamical quantum phase transitions in exciton condensates

2016

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We explore non-analytic quantum phase dynamics of dipolar exciton condensates formed in a system of 2D quantum layers subjected to voltage quenches. We map the exciton condensate physics on to the pseudospin ferromagnet model showing an additional oscillatory metastable phase beyond the well-known ferromagnetic phase by utilizing a time-dependent, non-perturbative theoretical model. We explain the coherent phase of the exciton condensate in quantum Hall bilayers, observed for currents equal to and slightly larger than the critical current, as a stable time-dependent phase characterized by persistent flow of charged order parameter defect in each of the individual layers with a characteristic AC Josephson frequency. As the magnitude of the voltage quench is further increased, we find that the time-dependent current oscillations associated with the charged order parameter defect flow decay, resulting in a transient pseudospin paramagnet phase characterized by partially coherent charge transfer between layers, before the state relaxes to incoherent charge transfer between the layers.

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Intrinsic Gap and Exciton Condensation in theνT=1Bilayer System

Cited by 23 publications

References 30 publications

-Wave Pairing in Quantum Hall Bilayers

-Wave Pairing in Quantum Hall Bilayers

Clausius-Clapeyron relations for first-order phase transitions in bilayer quantum Hall systems

Voltage-induced dynamical quantum phase transitions in exciton condensates

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