Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system

Abstract Quantum Hall ferromagnetic transitions are typically achieved by increasing the Zeeman energy through in-situ sample rotation, while transitions in systems with pseudo-spin indices can be induced by gate control. We report here a gate-controlled quantum Hall ferromagnetic transition between...

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Autores principales:	T. M. Lu, L. A. Tracy, D. Laroche, S.-H. Huang, Y. Chuang, Y.-H. Su, J.-Y. Li, C. W. Liu
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/3650b9ac5e904b8392c3e5a072007ba9
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spelling	oai:doaj.org-article:3650b9ac5e904b8392c3e5a072007ba92021-12-02T11:52:24ZDensity-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system10.1038/s41598-017-02757-22045-2322https://doaj.org/article/3650b9ac5e904b8392c3e5a072007ba92017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-02757-2https://doaj.org/toc/2045-2322Abstract Quantum Hall ferromagnetic transitions are typically achieved by increasing the Zeeman energy through in-situ sample rotation, while transitions in systems with pseudo-spin indices can be induced by gate control. We report here a gate-controlled quantum Hall ferromagnetic transition between two real spin states in a conventional two-dimensional system without any in-plane magnetic field. We show that the ratio of the Zeeman splitting to the cyclotron gap in a Ge two-dimensional hole system increases with decreasing density owing to inter-carrier interactions. Below a critical density of ~2.4 × 1010 cm−2, this ratio grows greater than 1, resulting in a ferromagnetic ground state at filling factor ν = 2. At the critical density, a resistance peak due to the formation of microscopic domains of opposite spin orientations is observed. Such gate-controlled spin-polarizations in the quantum Hall regime opens the door to realizing Majorana modes using two-dimensional systems in conventional, low-spin-orbit-coupling semiconductors.T. M. LuL. A. TracyD. LarocheS.-H. HuangY. ChuangY.-H. SuJ.-Y. LiC. W. LiuNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-8 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q T. M. Lu L. A. Tracy D. Laroche S.-H. Huang Y. Chuang Y.-H. Su J.-Y. Li C. W. Liu Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
description	Abstract Quantum Hall ferromagnetic transitions are typically achieved by increasing the Zeeman energy through in-situ sample rotation, while transitions in systems with pseudo-spin indices can be induced by gate control. We report here a gate-controlled quantum Hall ferromagnetic transition between two real spin states in a conventional two-dimensional system without any in-plane magnetic field. We show that the ratio of the Zeeman splitting to the cyclotron gap in a Ge two-dimensional hole system increases with decreasing density owing to inter-carrier interactions. Below a critical density of ~2.4 × 1010 cm−2, this ratio grows greater than 1, resulting in a ferromagnetic ground state at filling factor ν = 2. At the critical density, a resistance peak due to the formation of microscopic domains of opposite spin orientations is observed. Such gate-controlled spin-polarizations in the quantum Hall regime opens the door to realizing Majorana modes using two-dimensional systems in conventional, low-spin-orbit-coupling semiconductors.
format	article
author	T. M. Lu L. A. Tracy D. Laroche S.-H. Huang Y. Chuang Y.-H. Su J.-Y. Li C. W. Liu
author_facet	T. M. Lu L. A. Tracy D. Laroche S.-H. Huang Y. Chuang Y.-H. Su J.-Y. Li C. W. Liu
author_sort	T. M. Lu
title	Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
title_short	Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
title_full	Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
title_fullStr	Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
title_full_unstemmed	Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system
title_sort	density-controlled quantum hall ferromagnetic transition in a two-dimensional hole system
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/3650b9ac5e904b8392c3e5a072007ba9
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Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system

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