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Superfluidity of Helium-4 Films on Graphene Substrate
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- Author / Creator
- Yu, Sam
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We study the ground state physics of a helium-4 monolayer adsorbed onto graphene substrate through means of quantum Monte Carlo simulations. At low temperatures, helium-4 is well-known to undergo a superfluid transition. In the presence of a modulating potential from corrugated substrates like graphene however, the situation is less clear. This thesis is primarily aimed at addressing existing controversy in the literature about whether a metastable superfluid state exists when the system is a commensurate C1/3 crystal. Starting from a detailed microscopic model, we conduct first principles quantum Monte Carlo simulations of the system at both finite and zero temperature. Our results indicate the absence of a superfluid signal in the ground state crystal, with no evidence of a low-lying fluid state.
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- Subjects / Keywords
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- Graduation date
- Fall 2024
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- Type of Item
- Thesis
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- Degree
- Master of Science
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- License
- This thesis is made available by the University of Alberta Library with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.