Quantum Conductors in a Plane

TL;DR

This paper discusses the unexpected conductive behavior of electrons confined to a plane at low temperatures, challenging traditional theories and suggesting a potential new conducting state in two-dimensional systems.

Contribution

It presents experimental evidence of a novel conducting state in two-dimensional electron systems, contradicting standard expectations of insulating behavior at low temperatures.

Findings

Resistivity decreases as temperature lowers in 2D electron gases

No up-turn in resistivity observed at low temperatures

Evidence suggests a new conducting state in 2D systems

Abstract

When electrons are confined to move in a plane, strange things happen. For example, under normal circumstances, they are not expected to conduct electricity at low temperatures. However, recent experiments on a dilute electron gas confined to move at the interface between two semiconductors pose a distinct counterexample to the standard view. Transport measurements reveal that as the temperature is lowered, the resistivity drops without any signature of the anticipated up-turn as required by the standard account. It is the possible existence of a new conducting state in two dimensions that is the primary focus of this session.