Atomtronics deals with matter-wave circuits of ultracold atoms manipulated through
magnetic or laser-generated guides with different shapes and intensities. In this way, new …

By a combination of quantum field theory and general relativity, black holes have been
predicted to emit Hawking radiation. Observation from an actual black hole is, however …

Hawking argued that black holes emit thermal radiation via a quantum spontaneous
emission. To address this issue experimentally, we utilize the analogy between the …

We review phase-space techniques based on the Wigner representation that provide an
approximate description of dilute ultra-cold Bose gases. In this approach the quantum field …

We study the dynamics of a supersonically expanding, ring-shaped Bose-Einstein
condensate both experimentally and theoretically. The expansion redshifts long-wavelength …

We have created an analog of a black hole in a Bose-Einstein condensate. In this sonic
black hole, sound waves, rather than light waves, cannot escape the event horizon. A …

We report numerical evidence of Hawking emission of Bogoliubov phonons from a sonic
horizon in a flowing one-dimensional atomic Bose–Einstein condensate. The presence of …

We study the phonon fluxes emitted when the condensate velocity crosses the speed of
sound, ie, in backgrounds which are analogous to that of a black hole. We focus on …

Hawking radiation, despite being known to theoretical physics for nearly 40 years, remains
elusive and undetected. It also suffers, in its original context of gravitational black holes, from …

We consider elongated condensates that cross twice the speed of sound. In the absence of
periodic boundary conditions, the phonon spectrum possesses a discrete and finite set of …