Thesis
Commensurate and incommensurate 1D interacting quantum systems
- Creator
- Rights statement
- Awarding institution
- University of Strathclyde
- Date of award
- 2025
- Thesis identifier
- T17378
- Person Identifier (Local)
- 202063378
- Qualification Level
- Qualification Name
- Department, School or Faculty
- Abstract
- Quantum simulation is a versatile approach for exploring many-body quantum systems. Single-atom imaging using quantum gas microscopes has enabled direct observation of these systems in optical lattices. In this thesis, we employ a 87Rb quantum gas microscope to investigate the physics of strongly interacting quantum systems. A key feature of this microscope is its ability to utilise engineered dynamic light potentials, which provide additional versatility for simulating complex quantum systems. We explore the use of dynamically varying microscopic light potentials to study both commensurate and incommensurate one-dimensional (1D) systems. A system is said to be commensurate when there is an equal or multiple number of atoms to lattice sites, otherwise it is said to be incommensurate. In particular, we focus on strongly interacting incommensurate systems which, similar to doped insulating states, exhibit atom transport and compressibility. We begin with a commensurate system with unit filling and fixed atom number between two potential barriers. To prepare the incommensurate system, we dynamically adjust the position of the potential barriers, reducing the number of available lattice sites while maintaining a constant atom number. We characterise these systems by measuring the distribution of particles and holes as a function of lattice filling and interaction strength, and probe particle mobility by applying a bias potential. Our work establishes the groundwork for preparing low-entropy states with controlled filling in optical lattice experiments, thus advancing our understanding of strongly correlated systems. Additionally, we utilise these microscopic light potentials to realise the disordered Bose-Hubbard model, taking initial steps toward exploring the Bose-glass phase. The study of disordered systems opens new avenues for investigating localisation, phase transitions, and the interplay between disorder and coherence.
- Advisor / supervisor
- Kuhr, Stefan
- Resource Type
- DOI
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PDF of thesis T17378 | 2025-07-02 | Public | Download |