---
title: "Graphene: a thin flake became an electrical experiment"
description: "What made the 2004 thin-carbon experiment more than a successful exfoliation?"
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last_modified: "2026-10-23"
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Materials · Measurements · Explanation

# Graphene: a thin flake became an electrical experiment

What made the 2004 thin-carbon experiment more than a successful exfoliation?

Sandbox Physics · 2026-10-23

Nobel contribution: 2010-1

1. Identify a thin carbon flake
2. Fabricate electrical contacts
3. Tune carrier density with a gate
4. Measure transport in two dimensions

Preparation, thickness identification and electrical response are complementary evidence; a honeycomb drawing supplies none of them.

## Exfoliation had to lead to a contacted sample

Novoselov, Geim and colleagues reported electric-field effects in atomically thin carbon films in 2004. Mechanical exfoliation supplied flakes; locating thin regions and making contacts allowed their electronic behavior to be measured.

The 2010 award recognizes experimental work on graphene. The achievement includes turning a fragile-looking sheet into a reproducible material system, not merely drawing or naming a two-dimensional lattice.

Sources: [1] [2]

## A gate changed the conducting carriers

A gate voltage changes the charge density of the sheet through electrostatic coupling. Transport can pass between electron-dominated and hole-dominated behavior. Contacts, substrate disorder and residual charge complicate the response near charge neutrality.

Sources: [1]

## Two-dimensional bands invite further tests

The low-energy band structure of monolayer graphene motivates a Dirac description, but a field-effect curve alone does not establish every consequence of it. Magnetic oscillations and quantum Hall measurements provide additional tests of the electronic spectrum.

Sources: [1] [2]

## The linked models show band concepts

The periodic-band and Chern-insulator Labs provide controlled examples of band motion and integer topology. Their Hamiltonians describe their own systems. They should not be read as measurements of exfoliated graphene or as a prediction of a commercial graphene transistor.

Sources: [1] [3]

Continue with the physics

## Try the related models

### [Bloch-band dynamics](https://sandboxphysics.com/labs/bloch-oscillation-dynamics/)

Follow carriers in a periodic band under a force.

The periodic-band model has no exfoliated graphene sample, contacts or full Dirac transport analysis.

### [Chern insulator](https://sandboxphysics.com/labs/chern-insulator/)

Change a band mass and inspect the gap and topological response.

The band model explains an integer invariant; it has no fractional Hall quasiparticles.

## Sources and reading notes

1. [Novoselov and colleagues: Electric field effect in atomically thin carbon films (2004)](https://arxiv.org/abs/cond-mat/0410550)

   Author manuscript of the original field-effect paper. Sample fabrication and transport evidence go together.

2. [2010 Nobel award: experiments regarding graphene](https://www.nobelprize.org/prizes/physics/2010/press-release/)

   Official award context; prospective applications are historical expectations, not certified device performance.

3. [Nobel Prize in Physics 2010: official award](https://www.nobelprize.org/prizes/physics/2010/summary/)

   Official attribution and award year. The observation or theoretical paper may be much earlier.

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