Laser Cooling of Germanium Semiconductor Nanocrystals
- URL: http://arxiv.org/abs/2101.04833v1
- Date: Wed, 13 Jan 2021 02:04:50 GMT
- Title: Laser Cooling of Germanium Semiconductor Nanocrystals
- Authors: Manuchehr Ebrahimi, Wei Sun, Amr S. Helmy, Nazir P. Kherani
- Abstract summary: Anti-Stokes photoluminescence has been successfully realized in condensed media.
At high laser intensities, laser cooling with lattice temperature as low as 50K is inferred.
- Score: 2.329292456388869
- License: http://creativecommons.org/licenses/by-nc-nd/4.0/
- Abstract: Laser cooling of matter through anti-Stokes photoluminescence, where the
emitted frequency of light exceeds that of the impinging laser by virtue of
absorption of thermal vibrational energy, has been successfully realized in
condensed media, and in particular with rare earth doped systems achieving
sub-100K solid state optical refrigeration. Studies suggest that laser cooling
in semiconductors has the potential of achieving temperatures down to ~10K and
that its direct integration can usher unique high-performance nanostructured
semiconductor devices. While laser cooling of nanostructured II-VI
semiconductors has been reported recently, laser cooling of indirect bandgap
semiconductors such as group IV silicon and germanium remains a major
challenge. Here we report on the anomalous observation of dominant anti-Stokes
photoluminescence in germanium nanocrystals. We attribute this result to the
confluence of ultra-high purity nanocrystal germanium, generation of high
density of electron-hole plasma, the inherent degeneracy of longitudinal and
transverse optical phonons in non-polar indirect bandgap semiconductors, and
commensurate spatial confinement effects. At high laser intensities, laser
cooling with lattice temperature as low as ~50K is inferred.
Related papers
- Site-Controlled Purcell-Induced Bright Single Photon Emitters in Hexagonal Boron Nitride [62.170141783047974]
Single photon emitters hosted in hexagonal boron nitride (hBN) are essential building blocks for quantum photonic technologies that operate at room temperature.
We experimentally demonstrate large-area arrays of plasmonic nanoresonators for Purcell-induced site-controlled SPEs.
Our results offer arrays of bright, heterogeneously integrated quantum light sources, paving the way for robust and scalable quantum information systems.
arXiv Detail & Related papers (2024-05-03T23:02:30Z) - Purcell enhanced optical refrigeration [0.9401004127785267]
A minimum temperature of 87 K has been demonstrated with rare-earth ion doped crystals using optical refrigeration.
In this work, we introduce Purcell enhanced optical refrigeration method to circumvent this limitation.
The proposed method is applicable to other rare-earth ion doped materials and semiconductors, and will have applications in creating superconducting and other quantum devices with solid-state cooling.
arXiv Detail & Related papers (2024-04-29T23:00:27Z) - Laser cooling $^{88}$Sr to microkelvin temperature with an integrated-photonics system [3.261160333635571]
integrated-photonics devices generate a magneto-optical trap (MOT) of 88-strontium atoms at microkelvin temperature.
Experiments demonstrate an integrated photonics system capable of cooling alkaline-earth gases to microkelvin temperature.
arXiv Detail & Related papers (2024-04-19T23:17:37Z) - Quantum Emitters in Aluminum Nitride Induced by Zirconium Ion
Implantation [70.64959705888512]
This study investigates aluminum nitride (AlN) as a material with properties highly suitable for integrated on-chip photonics.
We conduct a comprehensive study of the creation and photophysical properties of single-photon emitters in AlN utilizing Zirconium (Zr) and Krypton (Kr) heavy ion implantation.
With the 532 nm excitation wavelength, we found that single-photon emitters induced by ion implantation are primarily associated with vacancy-type defects in the AlN lattice for both Zr and Kr ions.
arXiv Detail & Related papers (2024-01-26T03:50:33Z) - Microwave-based quantum control and coherence protection of tin-vacancy
spin qubits in a strain-tuned diamond membrane heterostructure [54.501132156894435]
Tin-vacancy center (SnV) in diamond is a promising spin-photon interface with desirable optical and spin properties at 1.7 K.
We introduce a new platform that overcomes these challenges - SnV centers in uniformly strained thin diamond membranes.
The presence of crystal strain suppresses temperature dependent dephasing processes, leading to a considerable improvement of the coherence time up to 223 $mu$s at 4 K.
arXiv Detail & Related papers (2023-07-21T21:40:21Z) - Photophysics of Intrinsic Single-Photon Emitters in Silicon Nitride at
Low Temperatures [97.5153823429076]
A robust process for fabricating intrinsic single-photon emitters in silicon nitride has been recently established.
These emitters show promise for quantum applications due to room-temperature operation and monolithic integration with the technologically mature silicon nitride photonics platform.
arXiv Detail & Related papers (2023-01-25T19:53:56Z) - Van der Waals Materials for Applications in Nanophotonics [49.66467977110429]
We present an emerging class of layered van der Waals (vdW) crystals as a viable nanophotonics platform.
We extract the dielectric response of 11 mechanically exfoliated thin-film (20-200 nm) van der Waals crystals, revealing high refractive indices up to n = 5.
We fabricate nanoantennas on SiO$$ and gold utilizing the compatibility of vdW thin films with a variety of substrates.
arXiv Detail & Related papers (2022-08-12T12:57:14Z) - Cavity-Enhanced 2D Material Quantum Emitters Deterministically
Integrated with Silicon Nitride Microresonators [0.3518016233072556]
Optically active defects in 2D materials, such as hexagonal boron nitride (hBN) and transition metal dichalcogenides (TMDs), are an attractive class of single-photon emitters.
We demonstrate a novel approach to precisely align and embed hBN and TMDs within background-free silicon nitride microring resonators.
arXiv Detail & Related papers (2022-06-29T18:16:38Z) - Ground-state Pulsed Cavity Electro-optics for Microwave-to-optical
Conversion [5.872328549827905]
We study the extraneous noise added to an electro-optic transducer in its quantum ground state under an intense pulsed optical excitation.
Our results shed light on suppressing microwave noise in a cavity electro-optic system under intense optical drive, which is an essential step towards quantum state between microwave and optical frequencies.
arXiv Detail & Related papers (2020-10-22T02:53:46Z) - Solid-state laser refrigeration of nanodiamond quantum sensors [43.55994393060723]
Solid-state laser refrigeration can be used to enable rapid optical temperature control of nitrogen vacancy doped nanodiamond quantum sensors.
Heat transfer to the ceramic microcrystals cooled the adjacent NV$-$:NDs by 10 and 27 K at atmospheric pressure and $sim$10$-3$ Torr.
arXiv Detail & Related papers (2020-07-30T05:57:01Z)
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.