Mixed-stacked pentalayer graphene

Cascade of even-denominator FQH states

Tunable even-denominator fractional quantum Hall states in mixed-stacked pentalayer graphene, offering a platform for non-Abelian anyons.

Sha, Yating · Liu, Kai · Jiang, Chenxin · Ye, Dan · Shuhan, Liu · Guo, Zhongxun · Gao, Jingjing · Wan, Neng · Watanabe, Kenji · Taniguchi, Takashi · Liu, Guangtong · Li, Lu · Zhang, Yuanbo · Shi, Zhiwen · Hu, Zixiang · Chen, Guorui

Nature Communications 2026

Specifications

Even-denominator filling factors
{'zh': '-5/2, -7/2, -9/2, -11/2, -13/2', 'en': '-5/2, -7/2, -9/2, -11/2, -13/2'}
Source Landau levels
{'zh': '2', 'en': '2'}
Number of zeroth Landau levels
{'zh': '2', 'en': '2'}

Advantages

Field-tunable

External displacement field continuously tunes the even-denominator states, enabling study of quantum phase transitions without changing sample.

Transitions observable

Continuous quantum phase transitions among even-denominator states, magnetic Bloch states, and composite Fermi liquids are observed, providing an experimental window into competing orders.

Pairing consistent

Numerical calculations support possible Moore-Read type pairing, hinting at non-Abelian statistics.

Applications