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Advances in Quantum Materials
This issue includes articles by world-leading scientists working on current problems in the field of experimental and theoretical solid state physics, single and twisted bilayer graphene, Bose-Einstein condensates, two-dimensional electron gas, and photovoltaics. The attention of this issue is devoted to quantum phases such as Insulators, Superconductors, Wigner Crystals, and to graphene and twisted bilayer graphene (TBG), where the interplay of strong electron-electron interactions and non-trivial topology play a crucial role, and which has been one of the most active fields of research in the past few years.
Guest Editors: A. Bernevig and Yu. G. Naidyuk

Pseudo-spin order of Wigner crystals in multi-valley electron gases
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Vladimir Calvera; Steven A. Kivelson; Erez Berg
Plethora of many body ground states in magic angle twisted bilayer graphene
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S. Y. Yang; A. Díez-Carlón; J. Díez-Mérida; A. Jaoui; I. Das; G. Di Battista; R. Luque-Merino; R. Mech; Dmitri K. Efetov
Insulators at fractional fillings in twisted bilayer graphene partially aligned to hexagonal boron nitride
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Dillon Wong; Kevin P. Nuckolls; Myungchul Oh; Ryan L. Lee; Kenji Watanabe; Takashi Taniguchi; Ali Yazdani
Andreev reflection between aluminum and graphene across van der Waals barriers
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Ko-Fan Huang; Önder Gül; Takashi Taniguchi; Kenji Watanabe; Philip Kim
Intrinsic efficiency of injection photocurrents in magnetic materials
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Alonso J. Campos-Hernandez; Yang Zhang; Adolfo G. Grushin; Fernando de Juan
Twisted bilayer graphene as topological heavy fermion: II. Analytical approximations of the model parameters
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Dumitru Călugăru; Maksim Borovkov; Liam L. H. Lau; Piers Coleman; Zhi-Da Song; B. Andrei Bernevig
Superfluidity of flat band Bose–Einstein condensates revisited
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Aleksi Julku; Grazia Salerno; Päivi Törmä