A compact device sustains a fluid of bosons

Article Multidisciplinary Sciences

Strongly correlated excitonic insulator in atomic double layers

Liguo Ma et al.

Summary: This study demonstrates a strongly correlated two-dimensional excitonic insulator ground state in transition metal dichalcogenide semiconductor double layers, providing direct thermodynamic evidence for the state. Capacitance measurements show that the exciton fluid is compressible but charge-incompressible. An exciton phase diagram reveals both the Mott transition and interaction-stabilized quasi-condensation.

NATURE (2021)

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Article Physics, Multidisciplinary

Second-Order Josephson Effect in Excitonic Insulators

Zhiyuan Sun et al.

Summary: A study revealed the presence of a second-order Josephson effect in specific structures, where the interlayer electrical current is related to the phase of the excitonic order parameter, allowing control over the system's ground states. This effect can be applied to ultrafast memories and the excitonic insulator candidate Ta2NiSe5.

PHYSICAL REVIEW LETTERS (2021)

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Article Multidisciplinary Sciences

Correlated electron-hole state in twisted double-bilayer graphene

Peter Rickhaus et al.

Summary: This study discovered a correlated electron-hole state in double-bilayer graphene twisted to 2.37 degrees, where moire states retain much of their isolated bilayer character. This allows the generation of an energetic overlap between narrow isolated electron and hole bands with good nesting properties, leading to the formation of ordered states with reconstructed Fermi surfaces consistent with a density-wave state that can be tuned without introducing chemical dopants.

SCIENCE (2021)

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Article Multidisciplinary Sciences