Ultrafast electron cooling in an expanding ultracold plasma

Kroker, Tobias; Großmann, Mario; Sengstock, K.; Drescher, Markus; Wessels-Staarmann, Philipp; Simonet, Juliette

doi:10.1038/s41467-020-20815-8

Cited by 14 publications

(5 citation statements)

References 41 publications

(30 reference statements)

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“…There are several existing diagnostic techniques for UNPs. Light (Cummings et al 2005;Castro, Gao & Killian 2008) and charge (Zhang, Fletcher & Rolston 2009;Schulz-Weiling & Grant 2016;Kroker et al 2021) imaging methods can be used to measure the ion component's spatial extent and velocities. But, these techniques do not extend to the electron component.…”

Section: Motivationmentioning

confidence: 99%

Calibrated heating rate measurements using electric-field-induced electron extraction in ultracold neutral plasmas

Guthrie,

Jiang,

Roberts

2024

J. Plasma Phys.

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The heating rate of plasma electrons induced by external fields or other processes can be used as an experimental tool to measure fundamental plasma properties such as electrical conductivity or electron–ion collision rates. We have developed a technique that can measure electron heating rates in ultracold neutral plasmas (UNPs) with $\sim 10\,\%$ precision while simultaneously referencing the measurement to a calibrated amount of heating. This technique uses a sequence of applied electric fields in four sections: to control the ratio of electrons to ions in the UNP; to provide a time for the application of fields that cause electron heating and subsequent thermalization of the electrons after the application of those fields; to extract electrons from the UNP using a method sensitive to electron temperature that allows the measurement of electron heating; and to extract the remaining electrons to measure the total electron (and therefore ion) number. The primary signal used to measure the heating rate is the measurement of the number of electrons that escape in the third section of the experiment as a larger number of escaping electrons indicates a larger amount of heating. We illustrate the use of this technique by measuring electron heating caused by high-frequency radiofrequency (RF) fields. In addition to the main technique, several subtechniques to calibrate the electron temperature, electron density, amount of heating and applied RF field amplitude were developed as well.

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Section: Motivationmentioning

confidence: 99%

Calibrated heating rate measurements using electric-field-induced electron extraction in ultracold neutral plasmas

Guthrie,

Jiang,

Roberts

2024

J. Plasma Phys.

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“…Ultracold neutral plasma (UNP) provides an excellent platform for investigating strongly coupled and high-energy-density plasma (HEDP). [1][2][3] Experimentally, UNPs can be produced by direct photoionization of laser-cooled atoms, [4][5][6][7] a Bose-Einstein condensate, 8 or from evolution of atomic, 9 molecular Rydberg gases. 10 The extremely low temperature of UNPs enables them to be in or near the strongly coupled regime, and dilute character implies long evolution timescale that ensures them to be precisely diagnosed.…”

Section: Introductionmentioning

confidence: 99%

Suppressing electron disorder-induced heating of ultracold neutral plasma via optical lattice

Wang,

Yao,

Huang

et al. 2024

Physics of Plasmas

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Disorder-induced heating (DIH) prevents ultracold neutral plasma into the electron strong coupling regime. Here, we propose a scheme to suppress electronic DIH via optical lattice. We simulate the evolution dynamics of ultracold neutral plasma constrained by three-dimensional optical lattice using the classical molecular dynamics method. The results show that for experimentally achievable conditions, electronic DIH is suppressed by a factor of 1.3, and the Coulomb coupling strength can reach 0.8, which is approaching the strong coupling regime. Suppressing electronic DIH via optical lattice may pave a way for the research of electronic strongly coupled plasma.

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“…A few experimental groups have recently attained the ultracold collisional regime in radio-frequency traps 26 , 27 . Alternatively, ions can be created in an ultracold gas by ionization of selected atoms from the bath 28 , 29 .…”

Section: Introductionmentioning

confidence: 99%

Many-body bound states and induced interactions of charged impurities in a bosonic bath

et al. 2023

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Induced interactions and bound states of charge carriers immersed in a quantum medium are crucial for the investigation of quantum transport. Ultracold atom-ion systems can provide a convenient platform for studying this problem. Here, we investigate the static properties of one and two ionic impurities in a bosonic bath using quantum Monte Carlo methods. We identify three bipolaronic regimes depending on the strength of the atom-ion potential and the number of its two-body bound states: a perturbative regime resembling the situation of a pair of neutral impurities, a non-perturbative regime that loses the quasi-particle character of the former, and a many-body bound state regime that can arise only in the presence of a bound state in the two-body potential. We further reveal strong bath-induced interactions between the two ionic polarons. Our findings show that numerical simulations are indispensable for describing highly correlated impurity models.

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Ultrafast electron cooling in an expanding ultracold plasma

Cited by 14 publications

References 41 publications

Calibrated heating rate measurements using electric-field-induced electron extraction in ultracold neutral plasmas

Calibrated heating rate measurements using electric-field-induced electron extraction in ultracold neutral plasmas

Suppressing electron disorder-induced heating of ultracold neutral plasma via optical lattice

Many-body bound states and induced interactions of charged impurities in a bosonic bath

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