Melting phase diagram of bubble phases in high Landau levels

Villegas Rosales, Kevin Amilcar; Singh, S. K.; Deng, H.; Chung, Y. J.; Pfeiffer, L. N.; West, K. W.; Baldwin, K. W.; Shayegan, Mansour

doi:10.1103/physrevb.104.l121110

Melting phase diagram of bubble phases in high Landau levels

Journal Article · Mon Sep 20 00:00:00 EDT 2021 · Physical Review. B

DOI:https://doi.org/10.1103/physrevb.104.l121110· OSTI ID:1849361

^[1]; Singh, S. K. ^[2]; Deng, H. ^[2]; Chung, Y. J. ^[2]; Pfeiffer, L. N. ^[2]; West, K. W. ^[2]; Baldwin, K. W. ^[2]; ^[2]

Princeton Univ., NJ (United States); OSTI
Princeton Univ., NJ (United States)

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. In this work, 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 (ν) and temperature, for the transition from the bubble to liquid phases for 4 ≤ ν ≤ 5.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Univ., NJ (United States)

Sponsoring Organization:: Gordon and Betty Moore Foundation; National Science Foundation (NSF); USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-00ER45841

OSTI ID:: 1849361

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 12 Vol. 104; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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