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A Study of Holon and Spinon Excitations of Hubbard Model through Ultracold Atomic Quantum Simulation
- Publication Year :
- 2022
-
Abstract
- The 2D Hubbard model with large repulsion is a central and yet unsolved problem in condensed matter physics for decades. The challenge appears below half filling, where the system is a doped antiferromagnet (AFM). In this regime, the fermion excitations are nothing like those in a Fermi liquid, which carry both spin and charge. Rather, they split up into holons and spinons, carrying charge and spin separately. Moreover, the motion of a holon is believed to stir up the underlying antiferromagnetic order, leaving behind it a string of spins mismatched with the AFM. While direct observation of the holon string is difficult in electron systems, it has become possible in cold atom experiments due to recent experimental advances. Here, we point out the key feature of the holon strings, i.e. its Marshall phase, can be observed through measurements of spin correlations. Moreover, the interference of these strings leads to an anisotropic holon propagation clearly distinguishable than those of spinless fermions, as well as a large suppression of the magnetic order in the region swept through by the strings, as if the system is driven towards a spin liquid. Furthermore, We demonstrate that how the spinon changes the Marshall phase of the holon strings, leading to a change in the holon propagation behavior.
- Subjects :
- Quantum Physics
Condensed Matter Physics
Subjects
Details
- Language :
- English
- Database :
- OpenDissertations
- Publication Type :
- Dissertation/ Thesis
- Accession number :
- ddu.oai.etd.ohiolink.edu.osu1657886003259589