https://scholars.lib.ntu.edu.tw/handle/123456789/428004
Title: | Density-controlled quantum Hall ferromagnetic transition in a two-dimensional hole system | Authors: | T. M. Lu L. A. Tracy D. Laroche S. –H. Huang Y. Chuang Y. –H Su Jiun-Yun Li CHEE-WEE LIU JIUN-YUN LI CHEE-WEE LIU |
Issue Date: | 2017 | Journal Volume: | 7 | Start page/Pages: | 3157 | Source: | Scientific Reports | 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. © 2017 The Author(s). |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/428004 https://www.scopus.com/inward/record.uri?eid=2-s2.0-85020171992&doi=10.1038%2fs41598-017-02757-2&partnerID=40&md5=9d88f0fda7bdc373d5d2b7ca681b400f |
ISSN: | 20452322 | DOI: | 10.1038/s41598-017-02757-2 |
Appears in Collections: | 電機工程學系 |
Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.