4.6 Article

Melting phase diagram of bubble phases in high Landau levels

期刊

PHYSICAL REVIEW B
卷 104, 期 12, 页码 -

出版社

AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.104.L121110

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资金

  1. National Science Foundation (NSF) [DMR 2104771]
  2. U.S. Department of Energy Basic Energy Office of Science, Basic Energy Sciences [DEFG02-00-ER45841]
  3. NSF [ECCS 1906253, DMR 1420541]
  4. Gordon and Betty Moore Foundation's EPiQS Initiative [GBMF9615]

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A low-disorder, two-dimensional electron system subjected to a large perpendicular magnetic field and cooled to very low temperatures provides a rich platform for studies of many-body quantum phases. The study investigates the screening properties of bubble phases and the penetration of electric fields at different temperatures in this system. The bubbles formed at very low temperatures poorly screen the electric field due to being pinned by the residual disorder potential, allowing a large electric field to reach the top gate.
A low-disorder, two-dimensional electron system (2DES) subjected to a large perpendicular magnetic field and cooled to very low temperatures provides a rich platform for studies of many-body quantum phases. The magnetic field quenches the electrons' kinetic energy and quantizes the energy into a set of Landau levels, allowing the Coulomb interaction to dominate. In excited Landau levels, the fine interplay between short- and long-range interactions stabilizes bubble phases, Wigner crystals with more than one electron per unit cell. Here, we present the screening properties of bubble phases, probed via a simple capacitance technique where the 2DES is placed between a top and a bottom gate and the electric field penetrating through the 2DES is measured. The bubbles formed at very low temperatures screen the electric field poorly as they are pinned by the residual disorder potential, allowing a large electric field to reach the top gate. As the temperature is increased, the penetrating electric field decreases and, surprisingly, exhibits a pronounced minimum at a temperature that appears to coincide with the melting temperature of the bubble phase. We deduce a quantitative phase diagram, as a function of Landau level filling factor (v) and temperature, for the transition from the bubble to liquid phases for 4 <= v <= 5.

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