Lateral electron confinement with open boundaries: quantum well states above nanocavities at Pb(111)

M. M. Muller, N. Neel, Simon Crampin, J. Kroger

Research output: Contribution to journalArticle

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Abstract

We have studied electron states present at the Pb(111) surface above Ar-fillednanocavities created by ion beam irradiation and annealing. Vertical confinement between the parallel crystal and nanocavity surfaces creates a series of quantum well state subbands. Differential conductance data measured by scanning tunneling spectroscopy contain additional spectroscopic features within the highest occupied subband, revealing additional quantization. Unexpectedly, reflection at the open boundary where the thin Pb film recovers its bulk thickness gives rise to lateral confinement of electrons.
Original languageEnglish
Article number136803
Pages (from-to)1-6
Number of pages6
JournalPhysical Review Letters
Volume117
Issue number13
Early online date22 Sep 2016
DOIs
Publication statusPublished - 23 Sep 2016

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