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Measuring Zak phase in room-temperature atoms.

Ruosong Mao1, Xingqi Xu1, Jiefei Wang1

  • 1Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, and Zhejiang Province Key Laboratory of Quantum Technology and Device, School of Physics, Zhejiang University, Hangzhou, 310027, China.

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Researchers developed a novel method to measure geometric phases in room-temperature superradiance lattices, overcoming thermal noise limitations in topological matter research. This technique utilizes atomic thermal motion to reveal spectroscopic signatures of Zak phases.

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Area of Science:

  • Quantum physics
  • Topological matter
  • Atomic physics

Background:

  • Cold atoms are ideal for studying topological matter, but thermal noise hinders applications.
  • Geometric phases, specifically Zak phases, are crucial for understanding topological properties and energy spectra.
  • Existing methods are limited by thermal noise in cold atom systems.

Purpose of the Study:

  • To develop a method for extracting geometric phases from room-temperature systems.
  • To overcome the limitations of thermal noise in topological matter research.
  • To enable the measurement of topological invariants in practical settings.

Main Methods:

  • Exploiting the relation between geometric phases and energy spectra in static force scenarios.
  • Utilizing room-temperature superradiance lattices, which are momentum-space lattices of timed Dicke states.
  • Analyzing spectroscopic signatures arising from effective forces generated by atomic thermal motion.

Main Results:

  • Successfully extracted geometric phases from energy spectra of room-temperature superradiance lattices.
  • Demonstrated that atomic thermal motion can be leveraged as an effective force, not just noise.
  • Measured Zak phases directly from anti-crossings in Doppler-broadened absorption spectra.

Conclusions:

  • The developed method enables direct measurement of topological invariants like Zak phases.
  • This approach opens avenues for practical applications of topological matter in room-temperature atomic systems.
  • Overcomes the noise limitations previously associated with cold atom topological research.