Wave Packet Propagation in Tilted Weyl Semimetals for Black Hole Analog Systems

TL;DR

This paper investigates how tilted Weyl semimetals can serve as tunable analog systems for black hole horizons, revealing different wave packet behaviors and horizon effects through spectral model comparisons.

Contribution

It introduces two models of tilted Weyl semimetals with contrasting spectral properties to simulate and analyze various types of analog black hole horizons.

Findings

One model shows complete wave reflection at the horizon.

The other model allows wave transmission across the horizon.

Wave packets with zero initial momentum experience strongest horizon effects.

Abstract

We explore the realization of distinct analog black hole horizons within tilted Weyl semimetals by comparing two models with contrasting spectral properties. We demonstrate that a spatially varying tilt in the Weyl cone structure creates an effect analogous to the tilting of light cones near a gravitational black hole horizon. By analyzing wave packet dynamics in both models, we reveal two fundamentally different types of analog horizons. The first model exhibits complete wave packet reflection, effectively mimicking an impenetrable barrier. In contrast, the second model permits wave packet transmission across the horizon. Critically, for both models, wave packets initialized with zero momentum ($k_0=0.0$) experience the strongest horizon effects, characterized by a dramatic slowing and significantly longer dwell times at the horizon region. Finally, we find that both systems exhibit substantial probability loss, which we demonstrate is directly correlated with the wave packet's dwell time near the horizon. Our findings establish tilted Weyl semimetals as a rich, tunable platform for investigating non-trivial quantum effects and information dynamics associated with analog black hole horizons.