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Hole localization in the one-dimensional doped Anderson-Hubbard model.
M Okumura1, S Yamada, N Taniguchi
1CCSE, Japan Atomic Energy Agency, 6-9-3 Higashi-Ueno, Taito-ku, Tokyo 110-0015, Japan. okumura.masahiko@jaea.go.jp
Disorder in the one-dimensional Anderson-Hubbard model surprisingly creates Mott regions, expanding with increased disorder. This anomalous phase is potentially observable in atomic Fermi gases.
Area of Science:
- Condensed matter physics
- Quantum many-body systems
Background:
- The Hubbard model is a fundamental model for strongly correlated electron systems.
- Understanding the interplay of disorder and correlation is crucial for condensed matter physics.
Purpose of the Study:
- To investigate the effects of disorder on a one-dimensional hole-doped Hubbard model (Anderson-Hubbard model).
- To analyze the behavior of the doped-hole-density profile under varying disorder strengths.
Main Methods:
- Utilizing the density-matrix renormalization group (DMRG) method.
- Focusing on the doped-hole-density profile in the large U/t regime.
Main Results:
- Clean systems exhibit fluidlike behavior.
- Finite disorders induce local Mott regions.
- These Mott regions expand with increasing disorder strength, contrary to conventional expectations.
Conclusions:
- Disorder can unexpectedly promote Mott phase formation in this system.
- This anomalous Mott phase is proposed to be observable in atomic Fermi gases using a box-shape trap.
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