Top row: An atomic image of strontium titanate with one single rare-earth (R) -oxygen layer in the middle. The structure model is shown in the middle, where red is oxygen, green is strontium, blue is titanium and yellow is the rare-earth element. The RO layer at the interface can donate electrons to neighboring atomic layers.
Bottom row: Atom-by-atom imaging and spectroscopy measurement of the electronic structure at a highly conductive interface where lanthanum oxide was inserted. The conductivity measurement shows a drastic difference in electron concentration at the interface for different R elements.
A multi-institutional team has made fundamental discoveries at the border regions, called interfaces, between oxide materials. Led by University of Wisconsin-Madison Materials Science and Engineering Professor Chang-Beom Eom, the team has discovered how to manipulate electrons oxide interfaces by inserting a single layer of atoms. The researchers also have discovered unusual electron behaviors at these engineered interfaces.
The researchers used two pieces of precisely grown strontium titanate, which is a type of oxide, or compound with oxygen as a fundamental element. Between the pieces, the researchers inserted a one-atom-thick layer of one of five rare-earth elements, which are important components in the electronics industry.
The team found that the rare-earth element layer creates an electron gas that has some interesting characteristics. The gas actually behaves more like an electron “liquid,” since the electrons move more in tandem, or in correlation, than a gas normally does.
“If you take two materials, each has different characteristics, and if you put them together, at their interface you may find something unexpected,” Eom says.
This research is the first demonstration of strong correlation among electrons at an oxide interface. The electron layer displayed distinct characteristics depending on the particular rare-earth element the team used. Materials with larger ionic radii, such as lanthanum, neodymium and praseodymium, are conducting, whereas materials with smaller radii, including samarium and yttrium, are insulating.
The insulating elements form an electron gas that can be compared to a thick liquid, somewhat like honey. The higher viscosity (basically, thickness) means the electrons can’t move around as freely, making them more insulating. Conversely, the conducting elements form a gas that is a “liquid” more like gasoline; the viscosity is lower, so the electrons can move more freely and are better conductors.
Prior to this research, scientists knew extra electrons could reside at interfaces, but they didn’t realize the complexity of how the electrons then behaved together at those interfaces.
The discovery of liquid-like behavior in the electron layer could open up an entire field of interfacial engineering for other scientists to explore, as well as new applications that take advantage of electron interactions. Since Eom and his colleagues developed an understanding of the basic physics behind these behaviors, their work could be expanded to create not only conductive or insulating interfaces, but also magnetic or optical ones.
Though scientists previously have looked at semiconductor interfaces, Eom’s team is the first to specifically address those that use oxide interfaces to control conducting states with a single atomic layer. Oxides make up a class of materials including millions of compounds, and each has its own unique set of properties. The ability to manipulate various oxide interfaces could give rise to new generations of materials, electronics and other devices.
“This advancement could make a broad impact in fields even beyond physics, materials or chemistry,” Eom says. “People can use the idea that an interface made from a single atomic layer of different ions can be used to create all kinds of properties.”