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In-gap corner states in core-shell polygonal quantum rings

In-gap corner states in core-shell polygonal quantum rings

Title: In-gap corner states in core-shell polygonal quantum rings
Author: Sitek, Anna   orcid.org/0000-0002-0602-1959
Ţolea, Mugurel
Niţă, Marian
Serra, Llorenç
Gudmundsson, Vidar   orcid.org/0000-0001-8939-3522
Manolescu, Andrei   orcid.org/0000-0002-0713-4664
Date: 2017-01-10
Language: English
Scope: 40197
University/Institute: Háskóli Íslands
University of Iceland
Háskólinn í Reykjavík
Reykjavik University
School: Verkfræði- og náttúruvísindasvið (HÍ)
School of Engineering and Natural Sciences (UI)
Tækni- og verkfræðideild (HR)
School of Science and Engineering (RU)
Department: Raunvísindastofnun (HÍ)
Science Institute (UI)
Series: Scientific Reports;7
ISSN: 2045-2322
DOI: 10.1038/srep40197
Subject: Condensed matter physics; Theoretical physics; Eðlisfræði; Kenningar
URI: https://hdl.handle.net/20.500.11815/296

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Citation:

Sitek, A. et al. In-gap corner states in core-shell polygonal quantum rings. Sci. Rep. 7, 40197; doi: 10.1038/srep40197 (2017).

Abstract:

We study Coulomb interacting electrons confined in polygonal quantum rings. We focus on the interplay of localization at the polygon corners and Coulomb repulsion. Remarkably, the Coulomb repulsion allows the formation of in-gap states, i.e., corner-localized states of electron pairs or clusters shifted to energies that were forbidden for non-interacting electrons, but below the energies of corner-side-localized states. We specify conditions allowing optical excitation to those states.

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