Imaging the Zigzag Wigner Crystal in Confinement-Tunable Quantum Wires

Sheng Chin Ho, Heng Jian Chang, Chia Hua Chang, Shun Tsung Lo, Graham Creeth, Sanjeev Kumar, Ian Farrer, David Ritchie, Jonathan Griffiths, Geraint Jones, Michael Pepper, Tse Ming Chen

Research output: Contribution to journalArticlepeer-review

6 Citations (Scopus)

Abstract

The existence of Wigner crystallization, one of the most significant hallmarks of strong electron correlations, has to date only been definitively observed in two-dimensional systems. In one-dimensional (1D) quantum wires Wigner crystals correspond to regularly spaced electrons; however, weakening the confinement and allowing the electrons to relax in a second dimension is predicted to lead to the formation of a new ground state constituting a zigzag chain with nontrivial spin phases and properties. Here we report the observation of such zigzag Wigner crystals by use of on-chip charge and spin detectors employing electron focusing to image the charge density distribution and probe their spin properties. This experiment demonstrates both the structural and spin phase diagrams of the 1D Wigner crystallization. The existence of zigzag spin chains and phases which can be electrically controlled in semiconductor systems may open avenues for experimental studies of Wigner crystals and their technological applications in spintronics and quantum information.

Original languageEnglish
Article number106801
JournalPhysical review letters
Volume121
Issue number10
DOIs
Publication statusPublished - 2018 Sep 6

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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