{"id":20491,"date":"2026-10-06T12:08:22","date_gmt":"2026-10-06T12:08:22","guid":{"rendered":"https:\/\/news.theck1.no\/?p=20491"},"modified":"2026-10-06T12:08:22","modified_gmt":"2026-10-06T12:08:22","slug":"magnetic-order-survives-weak-quantum-fluctuations-in-gapless-magnets-2","status":"publish","type":"post","link":"https:\/\/news.theck1.no\/?p=20491","title":{"rendered":"Magnetic order survives weak quantum fluctuations in gapless magnets"},"content":{"rendered":"

AI-rewritten:<\/strong> This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story.<\/p>\n

Phys.org • September 28, 2026<\/strong><\/div>\n\n

Researchers published a study in Physical Review Letters showing that magnetic order can survive weak quantum fluctuations in disordered magnets lacking an energy gap. This work confirms a longstanding conjecture regarding the stability of ferromagnetism in two-dimensional random-bond quantum Ising models. Unlike previous proofs, this method does not require the system to have an energy gap, which is the minimum energy needed to excite a system above its ground state.<\/p>\n

<\/p>\n

The study adapts the Peierls argument, originally used for classical magnets, to apply to quantum systems without gaps. In these models, spins interact randomly; while most favor alignment, some favor anti-alignment, creating clusters that can flip at almost no energy cost. This makes the magnet gapless, meaning it lacks a minimum energy threshold for excitation. The researchers proved that as long as random interactions are sufficiently biased toward alignment, the system remains ordered despite these fluctuations.<\/p>\n

Co-author Andrew Lucas of the University of Colorado Boulder explained that their team developed a new mathematical technique in 2024 to constrain many-body quantum states. They formulated a quantum version of the Peierls condition, demonstrating that low-energy states cannot afford domain walls spanning the entire system. Although small clusters can flip easily, the probability of forming a complete wall shrinks exponentially with its length, ensuring magnetism persists.<\/p>\n

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Source:<\/strong> Phys.org • September 28, 2026<\/p>\n

Read the original article at Phys.org →<\/a><\/p>\n<\/div>\n","protected":false},"excerpt":{"rendered":"

AI-rewritten: This is a summary of an article from Phys.org, rewritten by AI (Qwen, running locally) to make it easier to read. The facts come from the original article – read it for the full story. Phys.org • September 28, 2026 Researchers published a study in Physical Review Letters showing that magnetic order can survive<\/p>\n

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