Three effects, one transistor

Welcome to Track 4 — The Thesis. The next six lessons cover the intellectual core of CrystalSim: why a crystal-electromagnetic hybrid transistor could outperform silicon, and what evidence already exists. We start with the architecture: three pillars, each independently published in the literature, none combined into a single device until now.

Key Concept

Crystal Channel

The conducting region of a transistor made from an ordered crystalline material (GaN, InGaOx, ZnO, …) instead of amorphous or polycrystalline silicon. Periodic atomic lattice → fewer scattering events → higher mobility and lower thermal noise.

Key Concept

Piezoelectric Gating

Using mechanical strain on a piezoelectric crystal to generate a piezopotential that gates a transistor channel. The gate signal comes from the crystal itself — no separate biasing circuit needed.

Key Concept

Electromagnetic Coupling

Driving a piezoelectric crystal with an external EM field tuned near its mechanical resonance. The crystal vibrates, generates a piezopotential, and gates the transistor wirelessly.

Key Concept

Resonance

The frequency at which a system absorbs energy most efficiently. For a piezo crystal, resonance happens at f ≈ (1/2t)·√(E/ρ); driving at this frequency amplifies the response by the quality factor Q.

Diagram · The three pillars

interactive

Click the dots to step through each pillar; the final frame fuses all three.

Three soloists, one orchestra

Each pillar exists in the literature as a soloist: piezotronics labs publish piezo gating, materials labs publish crystal-channel devices, and antenna labs publish EM-coupled actuators. The thesis is to put all three on the same stage and let them play together.

Checkpoint · +5 XP

What unique advantage does the third pillar (EM coupling) add?

Why no one has unified these three: historically, crystal-channel research, piezotronics, and RF-coupled MEMS live in different academic departments with different fab requirements. Each pillar is well-validated in isolation. The Crystal-EM Hybrid asks: what happens if a single device exploits all three simultaneously? That is the question Tracks 4–6 explore.

Try It Yourself

Visualise the hybrid

Open the EM Coupling page to see how a real piezo crystal responds to an RF drive. We'll model the third pillar in detail in Lesson 5.

Open EM Coupling

Lesson Summary

Crystal-EM Hybrid rests on three independently-proven physical effects.
Pillar 1: ordered crystal lattices conduct electrons with far less scattering than amorphous silicon.
Pillar 2: piezoelectric crystals turn mechanical stress into a gate voltage — no external bias needed.
Pillar 3: tuned EM fields can resonantly excite the same crystals to gate them wirelessly.
The thesis: combining all three has never been done — that's the novelty.

Test Your Knowledge · +60 XP

Pillar 1 of the Crystal-EM thesis is:

Pillar 2 (piezoelectric gating) means:

What does pillar 3 add that pillars 1 and 2 do not?

Resonance is important because:

The thesis claim is novel because: