Controlled excitation of rotons in superfluid helium with an optical
centrifuge
- URL: http://arxiv.org/abs/2306.01955v1
- Date: Fri, 2 Jun 2023 23:30:03 GMT
- Title: Controlled excitation of rotons in superfluid helium with an optical
centrifuge
- Authors: Alexander A. Milner and Valery Milner
- Abstract summary: We show that the orientation of the angular momentum transferred from the laser field to the rotons, is dictated by the centrifuge.
The observed decay of the coherent Raman signal suggests that the decoherence is governed by the scattering on thermal rotons and phonons.
- Score: 77.34726150561087
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: We experimentally demonstrate a controlled transfer of angular momentum to
roton pairs in superfluid helium. The control is executed with an optical
centrifuge and detected with coherent time- and frequency-resolved Raman
scattering. We show that the sign of the Raman shift, and hence the orientation
of the angular momentum transferred from the laser field to the rotons, is
dictated by the centrifuge. The magnitude of the shift reflects the two-roton
energy and indicates that the centrifuge-induced hot roton pairs are far from
the equilibrium with the colder quantum bath. The observed decay of the
coherent Raman signal suggests that the decoherence is governed by the
scattering on thermal rotons and phonons. The demonstrated method offers ways
of examining microscopic origins of superfluidity by controlling collective
excitations in superfluids.
Related papers
- Observation of Space-Dependent Rotational Doppler Shifts with a Single Ion Probe [0.9785840554068875]
We present an experiment investigating the rotational Doppler effect using a single trapped ion excited by two copropagating vortex laser beams.
We provide a detailed characterization of the phenomenon by deterministically positioning a single ion across the beams.
arXiv Detail & Related papers (2024-07-06T13:47:49Z) - Theoretical Study on Superradiant Raman Scattering with Rubidium Atoms
in An Optical Cavity [7.998176799953779]
Superradiant Raman scattering of Rubidium atoms has been explored in the experiment [Nature 484, 78 (2012).
We develop a quantum master equation theory by treating the Rubidium atoms as three-level systems, and coupling them with a dressed laser and an optical cavity.
Our studies provide a unified view on the superradiant Raman scattering pulses, and an alternative explanation to the broad spectrum of the steady-state Raman scattering.
arXiv Detail & Related papers (2024-01-01T15:15:06Z) - Coherent control of molecular rotation in superfluid helium [39.58317527488534]
We experimentally demonstrate control of molecular rotation in bulk superfluid $4mathrmHe$.
We show that the degree of rotational excitation of $mathrmHe*$ can be enhanced or suppressed by varying the period of the pulse train.
arXiv Detail & Related papers (2023-11-22T00:40:18Z) - Dynamics of molecular rotors in bulk superfluid helium [68.8204255655161]
We report on the experimental study of the laser-induced rotation of helium dimers inside the superfluid $4mathrmHe$ bath at variable temperature.
The observed temperature dependence suggests a non-equilibrium evolution of the quantum bath, accompanied by the emission of the wave of second sound.
arXiv Detail & Related papers (2023-04-08T01:22:19Z) - Kagome qubit ice [55.73970798291771]
Topological phases of spin liquids with constrained disorder can host a kinetics of fractionalized excitations.
We present a realization of kagome spin ice in the superconducting qubits of a quantum annealer.
We show evidence of both the Ice-I phase and an unconventional field-induced Ice-II phase.
arXiv Detail & Related papers (2023-01-04T23:46:48Z) - Variational theory of angulons and their rotational spectroscopy [0.6299766708197884]
A quasiparticle formed by a quantum rotor dressed by the excitations of a many-body bath can be used to describe an impurity rotating in a fluid or solid environment.
We reveal the quasiparticle properties, such as energies, quasiparticle weights and spectral functions, and show that our ansatz yields a persistent decrease in the impurity's rotational constant due to many-body dressing.
arXiv Detail & Related papers (2022-11-15T11:46:05Z) - Rotating Majorana Zero Modes in a disk geometry [75.34254292381189]
We study the manipulation of Majorana zero modes in a thin disk made from a $p$-wave superconductor.
We analyze the second-order topological corner modes that arise when an in-plane magnetic field is applied.
We show that oscillations persist even in the adiabatic phase because of a frequency independent coupling between zero modes and excited states.
arXiv Detail & Related papers (2021-09-08T11:18:50Z) - State- and molecule-selective rotational control in gas mixtures with a
shaped optical centrifuge [0.0]
We experimentally excite two different molecular species to two different rotational frequencies of choice.
The new level of control is achieved by shaping the centrifuge spectrum according to the rotational spectra of the centrifuged molecules.
The technique will expand the utility of rotational control in the studies of the effects of molecular rotation on collisions and chemical reactions.
arXiv Detail & Related papers (2021-06-23T15:34:02Z) - Optically pumped spin polarization as a probe of many-body
thermalization [50.591267188664666]
We study the spin diffusion dynamics of 13C in diamond, which we dynamically polarize at room temperature via optical spin pumping of engineered color centers.
We find good thermal contact throughout the nuclear spin bath, virtually independent of the hyperfine coupling strength.
Our results open intriguing opportunities to study the onset of thermalization in a system by controlling the internal interactions within the bath.
arXiv Detail & Related papers (2020-05-01T23:16:33Z) - Entanglement dynamics in dissipative photonic Mott insulators [62.997667081978825]
In spite of particle losses the quantum entanglement propagation exhibits a ballistic character with propagation speeds related to the differerent quasiparticles that are involved in the dynamics.
Our analysis reveals that photon dissipation has a strikingly asymmetric behavior in the two configurations with a much more dramatic role on the holon entanglement propagation than for the doublon case.
arXiv Detail & Related papers (2020-04-27T15:48:24Z)
This list is automatically generated from the titles and abstracts of the papers in this site.
This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.