Quantum materials are solids whose unusual properties emerge from the quantum behavior and interactions of their electrons. The term covers several different material families—not one substance or a single technology—including superconductors, topological materials, quantum dots, and atomically thin materials. Some already have practical uses, while many proposed applications remain under development.
What are quantum materials?
“Quantum materials” is a broad research term without one universally agreed boundary. A useful working definition is solids whose distinctive, often collective properties arise from the quantum-mechanical behavior of their constituent electrons. In these materials, electrons and atoms can interact in ways that produce phases or responses not captured by ordinary classical descriptions. The U.S. Department of Energy workshop description, quoted in a peer-reviewed AIP perspective, calls them solids with exotic physical properties arising from the quantum mechanical properties of their electrons, with scientific or technological potential.
The label does not mean that quantum mechanics applies only to exotic or newly invented substances; quantum mechanics underlies matter generally. It identifies materials whose particular quantum effects give rise to unusual properties of research or practical interest. The field includes strongly interacting electron systems, topological materials, two-dimensional materials, and nanoscale structures in which quantum confinement matters. The National Academies’ Frontiers of Materials Research: A Decadal Survey discusses the field as part of a wider review of materials research.
What properties make them distinctive?
Quantum materials are grouped by the behaviors they exhibit, not by a single shared recipe. A material’s properties can depend on its composition, crystal structure, dimensionality, defects, interfaces, temperature, and external fields. Different families therefore show different effects and require different conditions.
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Superconductivity
Below a material-specific critical temperature, a superconductor carries direct current without electrical resistance and expels magnetic fields. The temperature at which superconductivity appears varies by material; “high-temperature” superconductors still need cooling. Some copper-oxide superconductors operate above liquid-nitrogen temperature, according to the U.S. Department of Energy.
Topological states
Topological insulators and semimetals can have distinctive electronic states at their surfaces or edges, even when the material’s interior behaves differently. Some topological materials can support surface conduction that is unusually robust in the presence of defects, as described by the National Science Foundation. Researchers are interested in these states because they may support electronic functions that are difficult to achieve with conventional materials.
Quantum confinement in quantum dots
Quantum dots are tiny semiconductor crystals whose optical and electronic properties are shaped by quantum confinement and interactions. Their behavior makes them useful in displays and sensors, and a subject of research for future quantum devices. The NSF notes their connection to QLED displays.
Two-dimensional materials
When a material is reduced to a few atomic layers, its electrical, optical, or magnetic behavior can differ from that of a thicker sample. Graphene is a prominent example within the broader family of two-dimensional materials, which the NSF also identifies as an area of quantum-materials research.
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Collective and magnetic phases
Other topics include strongly correlated electron phases, magnetic quantum materials, and quantum spin liquids. In such systems, interactions among particles can produce collective behavior that is not simply the sum of what each particle does alone. The mechanisms and material-preparation challenges vary across these families.
Examples and what they enable
| Material family or example | Quantum behavior | Practical use or research direction | Application status |
|---|---|---|---|
| Niobium-titanium superconducting alloy | Superconductivity below its critical temperature | Magnets used in MRI machines | Deployed technology; superconducting operation requires cooling |
| Quantum dots | Size-dependent optical and electronic properties shaped by quantum confinement | QLED television displays; sensors and future quantum devices | Display use is established; other uses vary from application to active research |
| Topological materials | Distinctive electronic states at surfaces or edges | Possible spin-based memory and logic; quantum-device research | Applications are being explored |
| Two-dimensional materials, including graphene | Electrical, optical, or magnetic behavior influenced by atomic-scale thickness | Research into material properties and potential devices | Uses depend on the material and application; the cited sources do not establish a single maturity level for this family |
The MRI example and superconductivity description are documented by the DOE; quantum-dot display uses and the examples of two-dimensional and topological materials are described by the NSF. These examples illustrate why “quantum material” does not name a single function: the useful effect might be resistance-free current, a surface electronic state, or a controlled optical response.
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What are quantum materials used for?
Uses already in products or equipment
- MRI magnets: Niobium-titanium superconducting alloy is used in MRI machines. Its superconducting behavior depends on cooling below its critical temperature.
- QLED displays: Quantum dots are used in QLED television displays, where their quantum-related optical properties are useful.
Applications still being developed
- Quantum computing and communication: Superconducting and topological systems are among the material platforms studied for quantum devices. Which platforms will ultimately prove suitable is not settled by the cited evidence; the National Academies noted in its 2019 survey that the material platforms for quantum-information devices had not yet been determined.
- Advanced sensing: Researchers are exploring quantum materials for sensors that could make use of their distinctive responses to external conditions.
- Low-power electronics and memory: Potential applications include electronic components and memory that use unusual material states or spin-based functions. Topological materials, for example, are being explored for spin-based memory and logic.
- Energy conversion and transport: The field also investigates whether quantum-material properties can contribute to future energy technologies.
These are research directions, not a claim that all such devices are commercially available or ready for routine use. The AIP perspective describes the broader technological potential, while the DOE discusses theoretical directions in condensed-matter physics.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Why are quantum materials difficult to develop?
There is no universal method for making a quantum material or preserving its behavior in a device. A desired effect may depend on carefully controlled composition and crystal structure, or on making a material only a few layers thick. Defects, interfaces, temperature, and external fields can also affect whether a property appears and remains useful.
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Producing unconventional compositions or phases can be technically challenging. Thin films may fit more readily into device fabrication, but that does not by itself solve the separate problems of integrating a material into a working device and ensuring dependable operation. The NSF identifies understanding how electron and atom interactions create unusual properties, manufacturing at scale, and reliable operation outside laboratories as important open questions.
As a result, a striking laboratory behavior is not enough to establish a practical technology. Researchers must also be able to reproduce the material, make it in useful quantities, and retain the needed performance under real operating conditions.
How to think about a quantum-material claim
When evaluating a claimed use, separate the material’s observed property from the device application built around it. A useful check is to ask:
- What specific quantum behavior is involved?
- What conditions—such as cooling, dimensionality, or an applied field—are required to observe it?
- Does the source describe a deployed product, a demonstrated device, or only a potential application?
- Are manufacturing scale and reliable operation outside a laboratory established?
This distinction avoids treating every promising quantum effect as an available technology. Superconductivity in an MRI magnet and quantum dots in QLED displays are concrete uses; quantum computing platforms, advanced sensing, and several energy applications remain active areas of investigation.
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