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Current Flow in the Bubble and Stripe Phases.

B Friess1, V Umansky2, K von Klitzing1

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Summary
This summary is machine-generated.

Surface acoustic waves reveal that current-induced changes in ordered electron systems are local, not bulk phenomena. This challenges conventional transport measurements and highlights acoustic methods for studying inhomogeneous phases.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Mesoscopic Physics

Background:

  • Spontaneous ordering of spins and charges into geometric patterns is observed in various material systems.
  • Interactions between ordered phases and itinerant electrons under external current are crucial for understanding charge ordering and pattern manipulation.
  • Conventional transport methods offer indirect information about bulk properties due to complex current distributions in inhomogeneous ground states.

Purpose of the Study:

  • To investigate the impact of external currents on broken-symmetry phases in two-dimensional electron systems.
  • To compare the effectiveness of surface acoustic waves versus conventional transport methods in probing these phases.
  • To analyze the bubble and stripe phases in GaAs/AlGaAs heterostructures as model systems.

Main Methods:

  • Utilizing surface acoustic waves to probe bulk properties of the material.
  • Applying unidirectional current to induce changes in the electron system.
  • Measuring sound propagation and voltage drop along sample edges for comparison.

Main Results:

  • A discrepancy was observed between sound propagation (bulk) and voltage drop (edge) measurements under current drive.
  • Current-induced modifications in resistive transport measurements were found to be a local phenomenon.
  • The majority of the sample remained unaltered by the applied current.

Conclusions:

  • Surface acoustic wave measurements provide direct insight into bulk properties, unlike conventional methods.
  • Current-induced effects on ordered electron phases are more localized than previously assumed.
  • Acoustic measurements offer intrinsic advantages for studying inhomogeneous phases in electronic materials.