{"product_id":"graphenes-πα-plate-058-physics-poster","title":"Graphene's πα – Plate 058 Physics Poster","description":"\u003cp\u003ePlate 58 speaks for itself: \u003cem\u003e“2.3% dark.”\u003c\/em\u003e\u003c\/p\u003e\u003ch3\u003eThe Physics\u003c\/h3\u003e\u003cp\u003eElectrons in graphene behave like massless Dirac particles with a linear dispersion. As a result a single atomic layer absorbs a fraction πα of visible light, set only by the fine-structure constant.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eE = ± ħ v_F |k|\u003c\/strong\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eE: electron energy, J\u003c\/li\u003e\n\u003cli\u003eħ: reduced Planck constant, J s\u003c\/li\u003e\n\u003cli\u003ev_F: Fermi velocity ≈ 10⁶ m s⁻¹\u003c\/li\u003e\n\u003cli\u003ek: wavevector from the Dirac point, m⁻¹\u003c\/li\u003e\n\u003cli\u003eα: fine-structure constant, dimensionless\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003eOne layer absorbs πα ≈ 2.29%. It depends only on α.\u003c\/p\u003e\u003ch3\u003eSources\u003c\/h3\u003e\u003cul\u003e\u003cli\u003eR. R. Nair et al., Science 320, 1308 (2008).\u003c\/li\u003e\u003c\/ul\u003e\u003ch3\u003eOn the poster\u003c\/h3\u003e\u003cp\u003ePlate 058, “Graphene's πα”: the pixel-art plate with its slogan “2.3% dark.”, the key equation and the facts panel shown above. Pixelated Physics. Physics. Personified.\u003c\/p\u003e","brand":"Printify","offers":[{"title":"9'' x 12\" (Vertical) \/ Matte","offer_id":50962543902823,"sku":"90909710976495526317","price":19.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Fine Art","offer_id":50962543935591,"sku":"72463066605661934087","price":29.99,"currency_code":"USD","in_stock":true},{"title":"9'' x 12\" (Vertical) \/ Semi Glossy","offer_id":50962543968359,"sku":"57510828153244901109","price":19.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Fine Art","offer_id":50962544001127,"sku":"20869474965911410729","price":44.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Semi Glossy","offer_id":50962544033895,"sku":"22891631175984356664","price":29.99,"currency_code":"USD","in_stock":true},{"title":"18″ x 24″ (Vertical) \/ Matte","offer_id":50962544066663,"sku":"29630659932185951999","price":29.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Matte","offer_id":50962544099431,"sku":"48028119874862834398","price":69.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Fine Art","offer_id":50962544132199,"sku":"29686192604801940227","price":119.99,"currency_code":"USD","in_stock":true},{"title":"36'' x 48\" (Vertical) \/ Semi Glossy","offer_id":50962544164967,"sku":"93309164393904771299","price":69.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0596\/8746\/9159\/files\/17606738589427873809_2048.jpg?v=1793634910","url":"https:\/\/pixelatedphysics.com\/zh-hant\/products\/graphenes-%cf%80%ce%b1-plate-058-physics-poster","provider":"Pixelated Physics","version":"1.0","type":"link"}