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Dini, D.; Dunford, R.B.; Stern, O.; Dietsche, W.; Mellor, C.J.; Klitzing, K. von; Wegscheider, Werner

doi:10.1103/physrevb.75.153307

Cited by 6 publications

(12 citation statements)

References 13 publications

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“…The sensitivity of the SAW to the stripe phase contrasts sharply with the behavior observed in the earlier work at the spin transition at ν = 2/3. There the domain structure leads to very large resistance anomalies in traditional transport but does not show up in the SAW propagation neither parallel nor perpendicular to the current flow direction [21,32]. It was argued that the resistance anomalies were caused by compressible domain walls with widths which are too thin for the SAW to sample.…”

Section: Discussionmentioning

confidence: 99%

“…No anisotropy is expected for the bubble phase. Again, in a SAW experiment one would expect to observe only the behavior of vanishing conductivity because all of the 2DES should be in the quantum Hall state, as concluded in SAW studies of another system where both types of domains are in the quantum Hall state [21].…”

Section: The Stripe and The Bubble Phasementioning

confidence: 92%

“…The SAW is generated and detected with an Agilent 5070 Network Analyzer. This instrument is equipped with a time resolution option enabling the collection of pulse-like data over a small frequency range [21]. By changing the frequency window of the instrument we switch between the transducer resonances and the two crystal directions.…”

Section: Saw and Resistivity Measurementsmentioning

confidence: 99%

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Acoustic measurements of the stripe and the bubble quantum Hall phase

Msall

Dietsche

2015

New J. Phys.

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We launch surface acoustic waves (SAW) along both the 〈 〉 110 and the 〈 〉 110 directions of a Hall bar and measure the anisotropic conductivity in a high purity GaAs two-dimensional electron system in the quantum Hall regime of the stripe and the bubble phases. In the anisotropic stripe phase, SAW propagating along the 'easy' 〈 〉 110 direction sense a compressible behavior (finite resistance) which is seen in standard transport measurement only if current flows along the 'hard' 〈 〉 110 direction. In the isotropic bubble phase, the SAW data show compressible behavior in both directions, in marked contrast to the incompressible quantum Hall behavior seen in transport measurements. These results challenge models that assume that both the stripe and the bubble phase consist of incompressible domains and raise important questions about the role of domain boundaries in SAW propagation.

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Section: Discussionmentioning

confidence: 99%

Section: The Stripe and The Bubble Phasementioning

confidence: 92%

Section: Saw and Resistivity Measurementsmentioning

confidence: 99%

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Acoustic measurements of the stripe and the bubble quantum Hall phase

Msall

Dietsche

2015

New J. Phys.

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“…Up to the existence of the domains was only postulated. In this report which is based upon our previous publications [25,26] we review our experiments which show the existence of differently polarized domains by NMR spectroscopy directly. We furthermore use surface acoustic wave absorption to determine the limits of the size of the domain walls and the domains themselves.…”

Section: Introductionmentioning

confidence: 97%

A study of the domain structure at the spin transition of the fractional quantum Hall effect

Stern

Dini

Freytag

et al. 2008

Physica Status Solidi (b)

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IntroductionThe spin degree of freedom plays an important role in the fractional quantum Hall effect (FQHE) [1]. It is responsible for a variety of phenomena such as phase transitions between different ground states, elementary spin excitations and interactions of the electronic system with the nuclei. This was initially not obvious since the first approach to solve this strongly correlated many-body problem considered all quantum Hall states at filling factors less than ν = 1 to be spin polarized [2]. Even though this indeed applies to fractional filling factors 1 m ν = / , where m is an odd integer, it was soon pointed out that for other fractional filling factors at sufficiently low densities, QH ground states with partial or zero spin polarization do exist [3].These states are energetically favorable whenever the exchange part of the Coulomb interaction becomes of the order of the Zeeman energy. Furthermore, at the transition, a domain pattern of differently polarized phases is believed to form [4][5][6][7]. In this review, we report on spectroscopic evidence for the existence of these domains, based on NMR and SAW (surface-acoustic wave) measurements. We focus primarily on the unpolarized-polarized phase transition at filling factor ν = 2/3, al-

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“…Another example related to the inhomogeneity in equilibrium states is about FQHE around ν = 2/3 with spin transition. The inhomogeneity from the coexistence of domains and domain walls is analyzed by means of SAW [25]. In the timedependent areal structure of ZRS, the domain walls display low conductivities, whereas the active current domains show high conductivities.…”

mentioning

confidence: 99%

Surface acoustic wave detection of robust zero-resistance states under microwaves

et al. 2020

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Microwave-induced resistance oscillations (MIRO) and zero-resistance states (ZRS) occur in high mobility two-dimensional electron gas (2DEG) exposed to microwave (MW). We observe that the velocity shift (∆v/v) oscillates in anti-correlation with MIRO, and ∆v/v shows peaks at the minimal resistance of MIRO or at ZRS. The SAW velocity features of ZRS remain robust even in the absence of external driving current, which suggests the involvement of intrinsic mechanism in the non-equilibrium phase. In addition, under high power MW, the phase (ϕ ac ) of ZRS stays constant at about 1/4, whereas the phase of the transitions in MIRO is reduced to below 0.10. We argue that the peaks of SAW velocity at ZRS may result from the inhomogeneity of superposed current domain structures. Moreover, a multi-photon process around ε = 1/2 is observed in the SAW measurements.

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Missing conductivity peak in a surface acoustic wave measurement atν=23

Cited by 6 publications

References 13 publications

Acoustic measurements of the stripe and the bubble quantum Hall phase

Acoustic measurements of the stripe and the bubble quantum Hall phase

A study of the domain structure at the spin transition of the fractional quantum Hall effect

Surface acoustic wave detection of robust zero-resistance states under microwaves

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