Quantum Confinement: The Smaller it is, the larger it becomes

What comes to mind when you think of the quantum realm?  

Perhaps you imagine time travel or parallel universes (inspired by movies like Ant-Man and Interstellar). While these films take creative liberties, the quantum realm is, in fact, a real concept in physics.  

It describes the strange and counterintuitive behavior of particles at the smallest scales (100 nanometers (10−9 meters) or less). Concepts like superposition* and entanglement** are few of the unique theories created to explain the unique nature of particles at nanoscale.  

Unlike the predictable laws of classical physics that govern our everyday world, the quantum realm operates under entirely different rules, challenging our understanding of reality. In essence, what we observe at our macro scale does not always align with what happens at the quantum level. 

So, the question arises: Why do materials in the nanoscale behave so strangely? 

To understand this, we need to first know what matters is 

Everything in this universe is made of matter. Starting from the smallest grain of soil to the largest planet in our solar system, matter is everywhere. 

Image of Atom 

The smallest unit of matter is an atom. Atoms are made up of protons, neutrons, and electrons (the main component of the atom that we’re focusing on for this blog are electrons). Electrons are negatively charged particles of the atom and are also responsible for a great number of chemical reactions. In fact, electrons are responsible for giving us electricity—hence the name 

When electrons move from one atom to another, they generate electricity — an incredible and fascinating phenomenon.  

Take this image, for instance:

Movement of electrons from atom to atom; These shifting electrons are electricity (Energy Knowledge Base.) 

As electrons travel between atoms, they create an electric current. While the movement shown here is horizontal, electricity can flow in any direction—vertically, diagonally, or even in waves. 

It’s important to note that this process is only the beginning of electrical generation. The electricity we use daily is the result of electrons flowing through a conductive material. Our perception of usable electricity requires a more complex system—things like rotating generators, inductors, and transformers all play a role in the process. This is a topic deserving of its own blog post! 

But for now, let's return to our current focus... Quantum Confinement! 

Before I explain what quantum confinement is, I've got a question for you: Do electrons produce more energy at the macro scale or the nano scale? If you're curious about the answer, keep reading. 

Quantum Confinement occurs when particles (such as protons and electrons) are restricted in their motion, which is where the term "confinement" comes from. 

To help clarify this concept, let's look at another image: 

Energy Field of electrons in Quantum Confinement 

The colored dots represent the size of the matter. As the size decreases (from red to blue), the gap in the conduction band increases. The conduction band refers to the energy level that electrons occupy as they move. You can observe that as the size of the material decreases, the frequency of the wavelength increases. This means that, as the waves become shorter, the energy produced by the electrons also increases. 

So, when you scale down to the quantum level, energy production actually increases. But why does this happen? The key lies in the fact that, as you move to the quantum realm, the distance between atoms decreases. You might wonder, with such a small space, how do the electrons still have room to generate power? 

It turns out that when electrons are confined to the quantum scale, they begin to collide with one another much more frequently. These collisions result in more energy being produced than if the electrons were simply traveling from one atom to another. This leads to a significant increase in energy production. In fact, by decreasing the size, the energy output increases. 

This phenomenon is called quantum confinement effect. As a result, the energy production becomes much higher when particles are confined to smaller spaces. 

This fascinating concept has profound implications for nanotechnology. By harnessing the quantum confinement effect, scientists can develop more efficient electrical sources such as renewable energy, semiconductors, and even quantum computing. In essence, as we delve deeper into the quantum realm, we uncover a paradoxical truth: shrinking materials to the nanoscale unlocks immense potential, proving that in the quantum world, sometimes less is truly more. 

*Superposition: Quantum superposition are particles that exist in multiple undefined states, that once combined, will collapse into singular observable state. To help you understand this better, let’s take an example.  

Imagine touching the surface of a pond in two different spots. Each touch creates its own set of ripples, spreading outward across the water. As they travel, the waves eventually meet and merge, forming a new pattern where they overlap.  Similarly, electrons can combine in the quantum and realm and become superposed.  

**Quantum Entanglement: When two particles become entangled in the quantum realm, they remain connected even when separated by vast difference.