{"id":48157,"date":"2023-03-30T00:00:55","date_gmt":"2023-03-29T16:00:55","guid":{"rendered":"https:\/\/www.science.nus.edu.sg\/?p=48157"},"modified":"2023-03-30T12:42:49","modified_gmt":"2023-03-30T04:42:49","slug":"towards-improving-future-electronic-devices-through-oxide-materials","status":"publish","type":"post","link":"https:\/\/www.science.nus.edu.sg\/blog\/2023\/03\/towards-improving-future-electronic-devices-through-oxide-materials\/","title":{"rendered":"Towards improving future electronic devices through oxide materials"},"content":{"rendered":"<p><span style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\"><span lang=\"EN-GB\">National University of Singapore<\/span><span lang=\"EN-GB\"> (NUS) physicists have demonstrated a new way of controlling Rashba interactions in oxide systems. This method for tuning and controlling Rashba interactions is particularly promising as it can potentially be integrated directly into functional logic and memory devices. <\/span><\/span><\/p>\n<p><span style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\"><span lang=\"EN-GB\"><b><\/b><\/span><span lang=\"EN-GB\">Scientists and engineers need devices that can process information efficiently while having ultra-low power consumption. Recently, there have been new developments in logic and memory devices that use the spin of electrons, in addition to their electronic charge, to store and process information. To make it work well, the device architecture needs a strong interaction between the spin of electrons and their orbital moments. This coupling, known as Rashba effect, allows for easy manipulation of spin currents and can lead to lower energy consumption. In particular, it can facilitate voltage-driven magnetization switching for logic and memory computing with reduced energy consumption, as proposed by Intel<sup>\u00ae<\/sup>*. However, to be useful in this regard, this effect must be significantly large even at zero applied voltages, which has remained difficult to realize in traditional semiconducting and metallic systems.<\/span><\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">The research team led by Professor Ariando from the Department of Physics, NUS, demonstrated that lattice polarisation and the trapping of interfacial charge carriers can result in a large Rashba spin-orbit effect at the oxide material interface in the absence of an external bias. This finding was published in <i>Physical Review Letters<\/i>.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">Oxide systems have great potential for exploiting the Rashba effect because their multiple degrees of freedom (charge, spin, orbital, and lattice) are entangled with one another. Under Prof Ariando\u2019s guidance and with the support of the research team, Dr Ganesh Ji OMAR, the lead author of the paper, came up with a new and different methodology for controlling the Rashba effect in oxide material systems. <\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">In their experiments, the researchers developed two-dimensional electron gas (2DEG) at LaAlO<sub>3<\/sub>-SrTiO<sub>3<\/sub> interfaces and buffered by a LaFeO<sub>3<\/sub> carrier modulating layer. All individual oxide layers during the fabrication process were controlled in real time and the resulting structures were validated using high-resolution electron microscopy. This heterostructure led to significant enhancement of Rashba effect at the correlated LaAlO<sub>3<\/sub>-SrTiO<sub>3<\/sub> interfaces even when no external voltage was applied. This remarkable enhancement effect was explained using a framework of \u201corbital hybridization of interfacial electronic wave functions\u201d at oxide interfaces (See Figure). The theoretical research team further validated this unconventional Rashba effect using density functional theory.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">Prof Ariando said, \u201cThis work highlights the fundamental role of lattice polarisation in achieving the observed enhancement of Rashba spin-orbit coupling and is particularly promising for efficient spin-to-charge conversion. Moreover, it can lead to the discovery of various other exotic properties, such as spiral magnetism, topological superconductivity, and intrinsic spin Hall effect.\u201d<\/span><\/p>\n<p><img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/01\/335._Ariando_PHY_20221121_1.jpg\" alt=\"\" class=\"alignnone  wp-image-46061\" width=\"681\" height=\"311\" srcset=\"https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/01\/335._Ariando_PHY_20221121_1.jpg 1104w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/01\/335._Ariando_PHY_20221121_1-300x137.jpg 300w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/01\/335._Ariando_PHY_20221121_1-1024x467.jpg 1024w, https:\/\/www.science.nus.edu.sg\/wp-content\/uploads\/2023\/01\/335._Ariando_PHY_20221121_1-768x351.jpg 768w\" sizes=\"(max-width: 681px) 100vw, 681px\" \/><\/p>\n<p><span style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">Figure shows that when the electrons are controlled using the Rashba effect (which involves a perpendicular internal field, E<sub>0<\/sub>), there are changes in the way they move and interact with each other in a material. This change causes the material structure to distort, similar to when you push and pull on a rubber band. The most likely positions for the electrons from the oxygen and titanium atoms are represented by the orange and blue colours (orbitals). These positions look distorted from their original position in two different planes for both the oxygen and titanium atoms, creating a new pattern strongly affected by the Rashba effect. [Credit: PHYSICAL REVIEW LETTERS]<\/span><\/p>\n<p>&nbsp;<\/p>\n<p><span style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\"><b><span lang=\"EN-GB\">Reference<\/span><\/b><\/span><\/p>\n<p><span lang=\"EN-US\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">Omar GJ; Kong WL; Jani H; Li MS; Zhou J; Lim ZS; Prakash S; Zeng SW; Hooda S; Venkatesan T; Feng YP; Pennycook SJ; Shen L; Ariando A*, &#8220;Experimental Evidence of t(2g) Electron-Gas Rashba Interaction Induced by Asymmetric Orbital Hybridization&#8221; PHYSICAL REVIEW LETTERS Volume: 129 Issue: 18 Article Number: 187203 DOI: 10.1103\/PhysRevLett.129.187203 Published: 2022.<\/span><\/p>\n<p><span lang=\"EN-GB\" style=\"font-size: 16px; font-family: arial, helvetica, sans-serif;\">* Manipatruni S, et al. &#8220;Beyond CMOS computing with spin and polarization&#8221; NATURE PHYSICS Volume: 14 Issue: 4 Page: 338-343 DOI: 10.1038\/s41567-018-0101-4 Published: 2018.<\/span><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>National University of Singapore (NUS) physicists have demonstrated a new way of controlling Rashba interactions in oxide systems. This method&#8230;<\/p>\n","protected":false},"author":16,"featured_media":46062,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[23,13],"tags":[],"class_list":["post-48157","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) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Towards improving future electronic devices through oxide materials - NUS Faculty of Science<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.science.nus.edu.sg\/blog\/2023\/03\/towards-improving-future-electronic-devices-through-oxide-materials\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Towards improving future electronic devices through oxide materials\" \/>\n<meta property=\"og:description\" content=\"National University of Singapore (NUS) physicists have demonstrated a new way of controlling Rashba interactions in oxide systems. 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