Quantum simulations of Higgs mode in strongly correlated atomic gases on the honeycomb lattice

2015 Fiscal Year Final Research Report

• Project/Area Number: 26800216
• Research Category: Grant-in-Aid for Young Scientists (B)
• Allocation Type: Multi-year Fund
• Research Field: Atomic/Molecular/Quantum electronics
• Research Institution: Tohoku Institute of Technology
• Principal Investigator: Tsuchiya Shunji 東北工業大学, 公私立大学の部局等, 准教授 (80579772)
• Project Period (FY): 2014-04-01 – 2016-03-31
• Keywords: Higgsモード / 光格子 / バレー内ペアリング / Kekuleパターン / Higgs束縛状態

Outline of Final Research Achievements

The Higgs particle plays a central role in the mechanism of mass generation in particle physics. It attracted attention by the recent discovery in the experiments at CERN's Large Hadron Collider. On the other hand, there are particles in solid-state materials such as magnets and superconductors that are analogous to the Higgs particle. These particles are called "Higgs mode". However, Higgs modes have not been much investigated because of the experimental difficulties. We theoretically study a Higgs mode in an atomic gas that is cooled down to ultra-low temperatures. We find a new type of low-energy Higgs mode that is spatially localized in the vicinity of impurities. We also study properties of atomic gases in a crystal that is artificially made of laser beams. We predict the emergence of a novel inhomogeneous superconducting state when the crystal has the honeycomb-lattice structure that is the same crystal structure as graphene.

Free Research Field

凝縮系物理