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Tuesday 12 August 2025, 14:00-15:00
Helium Spin Echo – An Open Quantum System
- 👤 Speaker: Matthew Ord, Cavendish Laboratory, University of Cambridge
- 📅 Date & Time: Tuesday 12 August 2025, 14:00 - 15:00
- 📍 Venue: Seminar Room North, Ray Dolby Centre, Cavendish Laboratory
Abstract
The Helium Spin Echo (HeSE) experiment offers a compelling example of an open quantum system, where interactions between a quantum particle and its environment are essential to understanding observed behaviour. In this talk, we use the HeSE setup to introduce the key concepts and terminology of open quantum systems, contrasting them with the conventional semiclassical interpretation. We then apply this framework to the dynamics of hydrogen adsorbates on surfaces during spin echo measurements. Using the Caldeira–Leggett model, we examine what can meaningfully be said about the quantum state of an adsorbed atom before, during, and after a scattering event.
Series This talk is part of the Surface Physics Seminar series.
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