Measuring Zak phase in room-temperature atoms
- URL: http://arxiv.org/abs/2111.12378v2
- Date: Thu, 13 Oct 2022 00:40:44 GMT
- Title: Measuring Zak phase in room-temperature atoms
- Authors: Ruosong Mao, Xingqi Xu, Jiefei Wang, Chenran Xu, Gewei Qian, Han Cai,
Shi-Yao Zhu, and Da-Wei Wang
- Abstract summary: We develop a method to extract geometric phases from spectra of room-temperature superradiance lattices.
We measure Zak phases direct-ly from the anti-crossings between Wannier-Stark ladders in the Doppler-broadened absorption spectra of superradiance lattices.
- Score: 17.911891075518604
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Cold atoms provide a flexible platform for synthesizing and characterizing
topolog-ical matter, where geometric phases play a central role. However, cold
atoms are intrinsically prone to thermal noise, which can overwhelm the
topological response and hamper promised applications. On the other hand,
geometric phases also de-termine the energy spectra of particles subjected to a
static force, based on the po-larization relation between Wannier-Stark ladders
and geometric Zak phases. By exploiting this relation, we develop a method to
extract geometric phases from en-ergy spectra of room-temperature superradiance
lattices, which are momentum-space lattices of timed Dicke states. In such
momentum-space lattices the thermal motion of atoms, instead of being a source
of noise, provides effective forces which lead to spectroscopic signatures of
the Zak phases. We measure Zak phases direct-ly from the anti-crossings between
Wannier-Stark ladders in the Doppler-broadened absorption spectra of
superradiance lattices. Our approach paves the way of measuring topological
invariants and developing their applications in room-temperature atoms.
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