Diamond Publications - Search Results

Search Again...

These results include publications that have not yet been reviewed and processed by Diamond Light Source. To view only processed publications click here.

You can use the folder icon under Actions to collate papers as required. You can then click on View Folder in the left-hand navigation to review and/or download your folder.

One item found (0 items not approved).

Instruments / Technical Area	Publication Details	Published	Actions
I05-ARPES	Observation of chiral fermions with a large topological charge and associated fermi-arc surface states in cosi Daichi Takane , Zhiwei Wang , Seigo Souma , Kosuke Nakayama , Takechika Nakamura , Hikaru Oinuma , Yuki Nakata , Hideaki Iwasawa , Cephise Cacho , Timur Kim , Koji Horiba , Hiroshi Kumigashira , Takashi Takahashi , Yoichi Ando , Takafumi Sato Physical Review Letters 122, 076402 DOI: 10.1103/PhysRevLett.122.076402 Diamond Proposal Number(s): [18839] Show Abstract ▼ Abstract: Topological semimetals materialize a new state of quantum matter where massless fermions protected by a specific crystal symmetry host exotic quantum phenomena. Distinct from well-known Dirac and Weyl fermions, structurally chiral topological semimetals are predicted to host new types of massless fermions characterized by a large topological charge, whereas such exotic fermions are yet to be experimentally established. Here, by using angle-resolved photoemission spectroscopy, we experimentally demonstrate that a transition-metal silicide CoSi hosts two types of chiral topological fermions, a spin-1 chiral fermion and a double Weyl fermion, in the center and corner of the bulk Brillouin zone, respectively. Intriguingly, we found that the bulk Fermi surfaces are purely composed of the energy bands related to these fermions. We also find the surface states connecting the Fermi surfaces associated with these fermions, suggesting the existence of the predicted Fermi-arc surface states. Our result provides the first experimental evidence for the chiral topological fermions beyond Dirac and Weyl fermions in condensed-matter systems, and paves the pathway toward realizing exotic electronic properties associated with unconventional chiral fermions.	Feb 2019

Instruments / Technical Area

Publication Details

Published

Actions

I05-ARPES

Observation of chiral fermions with a large topological charge and associated fermi-arc surface states in cosi