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We developed a new method to detect fractionalized excitations using a quench-probe system. This technique uniquely identifies Majorana zero modes by observing entanglement entropy changes, even without a topological initial state.

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Area of Science:

  • Condensed Matter Physics
  • Quantum Information Science

Background:

  • Detecting fractionalized excitations is crucial for understanding topological phases of matter.
  • Quantum quenches can induce exotic dynamics, but their signatures are often hard to isolate.

Purpose of the Study:

  • To introduce a novel experimental setup for revealing quench-induced fractionalized excitations.
  • To demonstrate a method for detecting Majorana zero modes through entanglement dynamics.

Main Methods:

  • A spatially inhomogeneous quench-probe setup where a quenched region is coupled to a static probe.
  • Monitoring time-dependent entanglement signatures of excitations propagating to the probe using energy selectivity.
  • Analyzing entanglement entropy changes in the probe to identify fractionalized excitations.

Main Results:

  • The quench-probe method successfully reveals fractionalized excitations in entanglement dynamics.
  • A unique dynamical signature, a fractionalized jump in entanglement entropy (log(2)/2), is identified for isolated Majorana zero modes.
  • This signature is highly sensitive to the localized nature of Majorana zero modes.

Conclusions:

  • The proposed quench-probe setup offers a generic and powerful approach to study quench-induced dynamics.
  • The observed entanglement entropy jump provides a sensitive, state-preparation-independent method for detecting Majorana zero modes.
  • This work opens new avenues for exploring topological properties in quantum systems.