Journal
PHYSICAL REVIEW B
Volume 106, Issue 17, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.106.174303
Keywords
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Funding
- Slovenian Research Agency
- Center for Integrated Nanotechnologies, a U.S. Department of Energy, Office of Basic Energy Sciences
- LANL Laboratory Directed Research and Development
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This study explores the ground state and thermodynamic properties of a polaron coupled to quantum dispersive optical phonons in one spatial dimension. The finite-temperature Lanczos method is used to calculate the electron removal spectral function, and it is shown that photoemission spectroscopy can be used to measure the phonon dispersion relation in a dilute system of polarons.
We explore the ground state and thermodynamic properties of the polaron coupled to quantum dispersive opti-cal phonons in one spatial dimension. Calculations are performed using the finite-temperature Lanczos method augmented by a highly efficient construction of the variational Hilbert space. We focus on the electron removal spectral function as relevant for the angle-resolved photoemission experiments. We show that photoemission spectroscopy can be used to measure the phonon dispersion relation in a dilute system of polarons. The spectral weight of observed phonon bands is proportional to the phonon contribution to the wavefunction at finite phonon momentum. In addition, we demonstrate that when removing an electron from a polaron ground state, the polaron band does not appear in the spectral function. The latter becomes observable only at elevated temperatures.
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