凝聚态物理
费米气体
共振(粒子物理)
库仑
电子
电导
物理
材料科学
化学
原子物理学
量子力学
作者
M. L. Davis,S. Parolo,C. Reichl,W. Dietsche,W. Wegscheider
出处
期刊:Cornell University - arXiv
日期:2023-04-13
被引量:2
标识
DOI:10.1103/physrevlett.131.156301
摘要
Bilayers consisting of two-dimensional (2D) electron and hole gases separated by a 10 nm thick AlGaAs barrier are formed by charge accumulation in epitaxially grown GaAs. Both vertical and lateral electric transport are measured in the millikelvin temperature range. The conductivity between the layers shows a sharp tunnel resonance at a density of $1.1 \cdot 10^{10} \text{ cm}^{-2}$, which is consistent with a Josephson-like enhanced tunnel conductance. The tunnel resonance disappears with increasing densities and the two 2D charge gases start to show 2D-Fermi-gas behavior. Interlayer interactions persist causing a positive drag voltage that is very large at small densities. The transition from the Josephson-like tunnel resonance to the Fermi-gas behavior is interpreted as a phase transition from an exciton gas in the Bose-Einstein-condensate state to a degenerate electron-hole Fermi gas.
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