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Allan Macdonald on Muck Rack

Allan Macdonald

As seen in: Medium, Nature, PNAS, The Globe and Mail, Physical Review B, Concord Monitor, UX Collective, Car Body Design, Academica Group, Plant and
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Articles

Two-component exciton condensates in an electron–hole bilayer

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By Ruishi Qi, Qize Li, Jiahui Nie, Ruichen Xia, Haleem Kim, Hyungbin Lim, Jingxu Xie, Takashi Taniguchi, Kenji Watanabe, Michael F. Crommie, Allan Macdonald, Feng Wang
| Nature Verified
Abstract Macroscopic quantum coherence emerges when bosons condense into a Bose–Einstein condensate (BEC)1,2,3,4,5. Excitons are a long-sought solid-state route to high-temperature BECs with strong interactions, electrical tunability and potentially multicomponent spinor order, but conclusive evidence for equilibrium condensation has remained elusive.
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Opinion: From the Big Lie to the Big Rig

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By Allan Macdonald
| Concord Monitor Verified
Donald Trump has long promoted the Big Lie that he won the 2020 election without offering evidence, the reason he has consistently lost in court. The data say that no U.S. candidate has lost an election this century through fraud, including him. He still maintains it was rigged. Fast forward to 2026, and we see Trump and Republicans overtly trying to rig the 2026 election. Trump strongarmed Texas into doing a mid-decade gerrymandering of their state to gain seats in the U.S. House.
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Six-state clock physics in an atomically thin antiferromagnet - Nature Materials

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By Frank Y. Gao, Dong Seob Kim, Ajesh Kumar, Xinyue Peng, Xiaohui Liu, Francesco Barantani, Shangjie Zhang, Kyoung Pyo Lee, Kalaivanan Raju, David Lujan, Saba Arash, Sankar Raman, Shang-Fan Lee, Mengxing Ye, Xiaoqin Li, Allan Macdonald, Edoardo Baldini
| Nature Verified
Abstract The study of collective behaviour driven by spontaneous symmetry breaking and topology is crucial for understanding phase transitions in quantum matter. The two-dimensional (2D) XY model, describing spins with continuous in-plane rotational symmetry, hosts the topological Berezinskii–Kosterlitz–Thouless (BKT) transition, where vortex–antivortex binding induces quasi-long-range order.
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