Projects per year

### Abstract

Recently, it was discovered that the ground-state orbital angular momentum in two-dimensional chiral superfluids with pairing symmetry (px+ipy)ν depends on the winding number ν in a striking manner. The ground-state value for the ν=1 case is Lz=N/2 as expected by counting the Cooper pairs, while a dramatic cancellation takes place for ν>1. The origin of the cancellation is associated with the topological edge states that appear in a finite geometry and give rise to a spectral asymmetry. Here, we study the reduction of orbital angular momentum for different potential profiles and pairing strengths, showing that the result Lz=N/2 is robust for ν=1 under all studied circumstances. We study how angular momentum depends on the gap size Δ/EF and obtain the result Lz=ν2N(1-μEF) for ν=2,3. Thus, the gap dependence of Lz for ν

Original language | English |
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Article number | 174505 |

Pages (from-to) | 1-10 |

Journal | Physical Review B |

Volume | 93 |

Issue number | 17 |

DOIs | |

Publication status | Published - 10 May 2016 |

MoE publication type | A1 Journal article-refereed |

## Fingerprint Dive into the research topics of 'Ground-state angular momentum, spectral asymmetry, and topology in chiral superfluids and superconductors'. Together they form a unique fingerprint.

## Projects

- 1 Finished

## Centre of Excellence in Low Temperature Quantum Phenomena and Devices

Golubev, D., Ronzani, A., Volovik, G., Viisanen, K., Westström, A., Tuoriniemi, J., Najafi Jabdaraghi, R. (., Pekola, J., Senior, J., Pöyhönen, K., Singh, S., Feshchenko, A. & Kauppila, V.

01/01/2015 → 31/12/2018

Project: Academy of Finland: Other research funding

## Equipment

## OtaNano – Low Temperature Laboratory

Pertti Hakonen (Manager)

Department of Applied PhysicsFacility/equipment: Facility