Measuring Zak phase in room-temperature atoms

  title={Measuring Zak phase in room-temperature atoms},
  author={Ruosong Mao and Xingqi Xu and Jiefei Wang and Chenran Xu and Gewei Qian and Han Cai and Shi-Yao Zhu and Da-Wei Wang},
  journal={Light, Science \& Applications},
Cold atoms provide a flexible platform for synthesizing and characterizing topological 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 determine the energy spectra of particles subjected to a static force, based on the polarization relation between Wannier-Stark ladders and geometric Zak phases. By exploiting… 

Floquet Superradiance Lattices in Thermal Atoms.

Floquet modulation has been widely used in optical lattices for coherent control of quantum gases, in particular for synthesizing artificial gauge fields and simulating topological matters. However,

Spectroscopic ellipsometry-based investigations into the scattering characteristics of topologically distinct photonic stopbands

Topological band theory provides a framework to establish the equivalence/inequivalence of bandgaps in photonic topological insulators. However, experimental discernment of bandgap topological



Direct measurement of the Zak phase in topological Bloch bands

Geometric phases that characterize the topological properties of Bloch bands play a fundamental role in the band theory of solids. Here we report on the measurement of the geometric phase acquired by

Measuring the Chern number of Hofstadter bands with ultracold bosonic atoms

Chern numbers characterize the quantum Hall effect conductance—non-zero values are associated with topological phases. Previously only spotted in electronic systems, they have now been measured in

Thermal-motion-induced non-reciprocal quantum optical system

Magnetic-free optical non-reciprocal components, such as isolators and circulators, are highly desirable for on-chip optical signal processing1,2 and quantum networks3,4. However, their realization

Experimental Observation of Momentum-Space Chiral Edge Currents in Room-Temperature Atoms.

The first experimental observation of chiral edge currents in atoms at room temperature is reported, paving the way for simulating topological physics in hot atoms.

Observation of the topological Anderson insulator in disordered atomic wires

This work synthesized one-dimensional chiral symmetric wires with controllable disorder via spectroscopic Hamiltonian engineering and observed the bulk evolution of a topological indicator after a sudden quench and the topological Anderson insulator phase, in which added disorder drives the band structure of a wire from topologically trivial to nontrivial.

Quantized electric multipole insulators

This work introduces a paradigm in which “nested” Wilson loops give rise to topological invariants that have been overlooked and opens a venue for the expansion of the classification of topological phases of matter.

Probing chiral edge dynamics and bulk topology of a synthetic Hall system

Quantum Hall systems are characterized by quantization of the Hall conductance—a bulk property rooted in the topological structure of the underlying quantum states 1 . In condensed matter devices,

Topological bands for ultracold atoms.

This review summarizes recent developments in realizing band structures with geometrical and topological features in experiments on cold atomic gases, beginning with a summary of the key concepts of geometry and topology for Bloch bands.

Topological phase transitions in superradiance lattices

Topological phases of matter are of fundamental interest and have promising applications. Fascinating topological properties of light have been unveiled in classical optical materials. However, the

Superradiance lattice.

We show that the timed Dicke states of a collection of three-level atoms can form a tight-binding lattice in momentum space. This lattice, coined the superradiance lattice (SL), can be constructed