{"id":62025,"date":"2024-04-15T00:00:12","date_gmt":"2024-04-14T16:00:12","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=62025"},"modified":"2024-04-15T11:02:01","modified_gmt":"2024-04-15T03:02:01","slug":"a-magnetic-butterfly-with-entangled-spins-for-quantum-technologies","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2024\/04\/a-magnetic-butterfly-with-entangled-spins-for-quantum-technologies\/","title":{"rendered":"A magnetic \u201cbutterfly\u201d with entangled spins for quantum technologies"},"content":{"rendered":"<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">National University of Singapore (NUS) researchers have developed a new design concept for creating next-generation carbon-based quantum materials, in the form of a tiny magnetic nanographene with a unique butterfly-shape hosting highly correlated spins, demonstrating potential for advancements in quantum information technologies.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Magnetic nanographene, a tiny structure made of graphene molecules, exhibits remarkable magnetic properties due to the behaviour of specific electrons in the carbon atoms\u2019 \u03c0-orbitals. Unlike conventional magnetic materials produced using heavy metals, where the different types of electrons (from d- or f-orbitals) are involved, carbon&#8217;s \u03c0-electrons play a unique role. By precisely designing the arrangement of these carbon atoms at the nanoscale, control over the behaviour of these unique electrons can be achieved. This renders nanographene highly promising for creating extremely small magnets and for fabricating the basic components, known as quantum bits or qubits, essential for the development of quantum computers. High-quality qubits need to maintain their quantum state for an extended duration (coherence time) while operating quickly. Carbon-based materials are known to extend the coherence times of spin qubits, due to their two unique properties: weak spin-orbit and hyperfine couplings that effectively prevent decoherence of electron spins.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">A team of NUS researchers led by Associate Professor Jiong LU from the Department of Chemistry and Institute for Functional Intelligent Materials, NUS together with Professor Jishan WU also from the Department of Chemistry, NUS and international collaborators, have developed a method for designing and creating a large fully-fused butterfly-shaped magnetic nanographene. This unique structure has four rounded triangles resembling \u201cbutterfly wings\u201d, with each of these wings holding an unpaired \u03c0-electron responsible for the observed magnetic properties. The structure was achieved through an atomic-precise design of the \u03c0-electron network in the nanostructured graphene.<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" width=\"967\" height=\"576\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_3.jpg\" alt=\"\" class=\"size-full wp-image-63362 alignnone\" srcset=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_3.jpg 967w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_3-300x179.jpg 300w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_3-768x457.jpg 768w\" sizes=\"(max-width: 967px) 100vw, 967px\" \/><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14px;\"><em>Associate Professor Lu Jiong (left), Dr Song Shaotang (middle) and Professor Wu Jishan (right) were part of the multidisciplinary research team which developed the butterfly-shaped magnetic nanographene which could advance quantum technologies.<\/em><\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Prof Lu said, \u201cMagnetic nanographene, a tiny molecule composed of fused benzene rings, holds significant promise as a next-generation quantum material for hosting fascinating quantum spins due to its chemical versatility and long spin coherence time. However, creating multiple highly entangled spins in such systems is a daunting yet essential task for building scalable and complex quantum networks.\u201d<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">This significant achievement is a result of close collaboration among synthetic chemists, materials scientists, and physicists, including key contributors Professor Pavel JELINEK and Dr Libor VEI, both from the Czech Academy of Sciences in Prague.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">The research breakthrough was published in the scientific journal <em>Nature Chemistry<\/em>.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">The magnetic properties of nanographene are usually derived from the arrangement of its special electrons, known as \u03c0-electrons, or the strength of their interactions. However, it is difficult to make these properties work together to create multiple correlated spins. Nanographene also predominately exhibits a singular magnetic order, where spins align either in the same direction (ferromagnetic) or in opposite directions (antiferromagnetic).<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">The researchers developed a method to overcome these challenges. Their butterfly-shaped nanographene, with both ferromagnetic and antiferromagnetic properties, is formed by combining four smaller triangles into a rhombus at the centre. The nanographene measures approximately 3 nanometres in size.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">To produce this &#8220;butterfly&#8221; nanographene, the researchers initially designed a special molecule precursor via conventional in-solution chemistry. This precursor was then used for the subsequent on-surface synthesis, a new type of solid-phase chemical reaction performed in a vacuum environment. This approach allowed the researchers to precisely control the shape and structure of the nanographene at the atomic level.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">One intriguing aspect of this \u201cbutterfly\u201d nanographene is that it has four unpaired \u03c0-electrons, with spins mainly delocalised in the &#8220;wing&#8221; regions and entangled together. Using an ultra-cold scanning probe microscope with nickelocene tip as an atomic-scale spin sensor, the researchers measured the exotic magnetism of the butterfly nanographenes. Additionally, this new technique helps scientists in directly probing entangled spins to understand how the nanographene&#8217;s magnetism works at the atomic-scale. This breakthrough not only tackles existing challenges but also opens up new possibilities for precisely controlling the magnetic properties at the smallest scale, leading to exciting advancements in quantum materials research.<\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">\u201cThe insights gained from this study pave the way for creating new-generation organic quantum materials with designer quantum spin architectures. Looking ahead, our goal is to measure the spin dynamics and coherence time at the single-molecule level and manipulate these entangled spins coherently. This represents a significant stride towards achieving more powerful information processing and storage capabilities,\u201d added Prof Lu.<\/span><\/p>\n<p><img decoding=\"async\" width=\"1654\" height=\"975\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4.jpg\" alt=\"\" class=\"alignnone size-full wp-image-63363\" srcset=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4.jpg 1654w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4-300x177.jpg 300w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4-1024x604.jpg 1024w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4-768x453.jpg 768w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2024\/04\/367._Lu_J_CHM_20240219_4-1536x905.jpg 1536w\" sizes=\"(max-width: 1654px) 100vw, 1654px\" \/><\/p>\n<p><em><span style=\"font-family: arial, helvetica, sans-serif; font-size: 14px;\">Figure illustrating (left) a visual impression of the magnetic \u201cbutterfly\u201d hosting four entangled spins on \u201cwings\u201d and (right) its corresponding atomic-scale image obtained using scanning probe microscopy.<\/span><\/em><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\"><strong><span lang=\"EN-GB\">Reference<\/span><\/strong><\/span><\/p>\n<p><span style=\"font-family: arial, helvetica, sans-serif; font-size: 16px;\">Shaotang Song; Andr\u00e9s Pinar Sol\u00e9; Adam Mat\u011bj; Guangwu Li; Oleksandr Stetsovych; Diego Soler; Huimin Yang; Mykola Telychko; Jing Li; Manish Kumar; Qifan Chen; Shayan Edalatmanesh; Jiri Brabec; Libor Veis*; Jishan Wu*; Pavel Jelinek*; Jiong Lu*, \u201cHighly-Entangled Polyradical Nanographene with Coexisting Strong Correlation and Topological Frustration\u201d Nature Chemistry, DOI: 10.1038\/s41557-024-01453-9 Published: 2024.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>National University of Singapore (NUS) researchers have developed a new design concept for creating next-generation carbon-based quantum materials, in the&#8230;<\/p>\n","protected":false},"author":16,"featured_media":62029,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23,13],"tags":[],"class_list":["post-62025","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-advanced-materials","category-research-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v23.6 (Yoast SEO v23.6) - 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