Dissertation
QUANTUM FLUID AND SOLID PROPERTIES OF HELIUM ON CARBON SUBSTRATES FROM NUMERICALLY EXACT QUANTUM SIMULATION
Doctor of Philosophy (PhD), Washington State University
01/2020
Handle:
https://hdl.handle.net/2376/117278
Abstract
This thesis focuses on methodological improvements to the adiabatic quantum Monte Carlo simulation of 4He on the C substrates graphene and graphite, and quantum Monte Carlo simulation results for 4He on strained graphene. The former is carried out through an analysis of the influence of 4He–C and 4He–4He interatomic potentials on the stable phases of the sub-monolayer phase diagram of helium on graphene. From this work, we conclude that an isotropic type 4He–C potential best replicates experimentally confirmed aspects of the system, and then carry out the latter aspect of the thesis, simulation of 4He on strained graphene, using an isotropic type potential. Results for stable phases of 4He on strained graphene and biased estimates of the anisotropic superfluid fractions are reported for the herein. In addition to these results, aspects of Monte Carlo simulations are discussed, and future directions based on the completed work are suggested.
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Details
- Title
- QUANTUM FLUID AND SOLID PROPERTIES OF HELIUM ON CARBON SUBSTRATES FROM NUMERICALLY EXACT QUANTUM SIMULATION
- Creators
- Thomas Lee Badman
- Contributors
- Jeffrey M McMahon (Advisor)Peter Engels (Committee Member)Aurora Clark (Committee Member)
- Awarding Institution
- Washington State University
- Academic Unit
- Physics and Astronomy, Department of
- Theses and Dissertations
- Doctor of Philosophy (PhD), Washington State University
- Number of pages
- 141
- Identifiers
- 99900581610301842
- Language
- English
- Resource Type
- Dissertation