The strongly driven Fermi polaron
- URL: http://arxiv.org/abs/2308.05746v1
- Date: Thu, 10 Aug 2023 17:59:51 GMT
- Title: The strongly driven Fermi polaron
- Authors: Franklin J. Vivanco, Alexander Schuckert, Songtao Huang, Grant L.
Schumacher, Gabriel G. T. Assump\c{c}\~ao, Yunpeng Ji, Jianyi Chen, Michael
Knap, Nir Navon
- Abstract summary: Quasiparticles are emergent excitations of matter that underlie much of our understanding of quantum many-body systems.
We take advantage of the clean setting of homogeneous quantum gases and fast radio-frequency control to manipulate Fermi polarons.
We measure the decay rate and the quasiparticle residue of the driven polaron from the Rabi oscillations between the two internal states.
- Score: 49.81410781350196
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: Quasiparticles are emergent excitations of matter that underlie much of our
understanding of quantum many-body systems. Therefore, the prospect of
manipulating their properties with external fields -- or even destroying them
-- has both fundamental and practical implications. However, in solid-state
materials it is often challenging to understand how quasiparticles are modified
by external fields owing to their complex interplay with other collective
excitations, such as phonons. Here, we take advantage of the clean setting of
homogeneous quantum gases and fast radio-frequency control to manipulate Fermi
polarons -- quasiparticles formed by impurities interacting with a
non-interacting Fermi gas -- from weak to ultrastrong drives. Exploiting two
internal states of the impurity species, we develop a steady-state
spectroscopy, from which we extract the energy of the driven polaron. We
measure the decay rate and the quasiparticle residue of the driven polaron from
the Rabi oscillations between the two internal states. At large drive
strengths, the so-extracted quasiparticle residue exceeds unity, raising
intriguing questions on the relationship between the Rabi oscillations and the
impurity's spectral functions. Our experiment establishes the driven Fermi
polaron as a promising platform for studying controllable quasiparticles in
strongly driven quantum matter.
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