Mobility of Electrons at Liquid Helium Surface under Overheating

Syvokon, V. E.; Monarkha, Yu. P.; Nasyedkin, K. A.; Соколов, С. С.

doi:10.1007/s10909-007-9365-2

Cited by 7 publications

(12 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…That difference was a result of the lack of the measurement accuracy caused by difficulties in the experimental cell analysis. Later [3] an improvement of this analysis had given better numerical agreement with the theory at high holding fields.…”

Section: Introductionmentioning

confidence: 87%

See 1 more Smart Citation

Nonlinear surface electron transport over liquid helium

Nasyedkin

Sivokon

Monarkha

et al. 2009

Low Temperature Physics

View full text Add to dashboard Cite

We present experimental data and a theoretical analysis of nonequilibrium mobility of surface electrons in liquid helium. The experiments are carried out in the temperature range where electron mobility is limited by electron scattering at surface excitations of liquid helium (ripplons). Holding and driving electric fields of wide ranges are used in measurements. Special attention is paid to the condition of strong holding fields under which hot electrons are confined to the ground surface level. Depending on the relation between the momentum relaxation rate and electron-electron collision frequency, different theoretical approaches are used to describe the nonlinear mobility of surface electrons. The results obtained allow to estimate the range of physical parameters where experimental data can be described by the theory of nonlinear electron transport within the ground surface level.PACS: 68.03.-g Gas-liquid and vacuum-liquid interfaces;73.20.-r Electron states at surfaces and interfaces; 73.25.+i Surface conductivity and carrier phenomena.

show abstract

Section: Introductionmentioning

confidence: 87%

“…Previously, when solving Eqs. (1) [2,3] either the value c 2 was disregarded or the set of Eqs. To simplify the analysis of results initial data were approximated by a smooth curve before being used for esti- .…”

Section: Methodsmentioning

confidence: 99%

Nonlinear surface electron transport over liquid helium

Nasyedkin

Sivokon

Monarkha

et al. 2009

Low Temperature Physics

View full text Add to dashboard Cite

show abstract

“…Though the exact theoretical treatment of 2-ripplon scattering remains an open question, we follow Ref. [7] as it has previously provided results in reasonable agreement with experimental measurements [9,10]. We simplify the analysis by assuming electrons populate only the ground state subband for vapor atom scattering and by setting the holding field E ⊥ = 0 V/m for 2-ripplon scattering.…”

mentioning

confidence: 96%

“…Of equal importance are the inelastic scattering processes which are characterized with the energy relaxation of SSE.There is a great deal of interest in understanding inelastic scattering of the SSE. Inelastic processes [4][5][6][7] are fundamental for understanding and describing a wide variety of SSE phenomena including non-linear transport [4,[8][9][10][11] and microwave absorption line shapes [12][13][14][15]. Further, renewed interest in these processes has emerged with the realization that the energy relaxation rates determine the coherence times of Rydberg state based SSE qubits [6,[16][17][18][19][20].Electron thermometry is crucial for experimental measurement of energy relaxation, but thermometry of hot SSE presents a serious challenge.…”

mentioning

confidence: 99%

See 1 more Smart Citation

Thermopower-Based Hot Electron Thermometry of Helium Surface States at 1.6 K

Kleinbaum

Lyon

2018

Phys. Rev. Lett.

View full text Add to dashboard Cite

We have developed a method to probe the temperature of surface state electrons (SSE) above a superfluid Helium-4 surface using the Seebeck effect. In contrast to previously used SSE thermometry, this technique does not require detailed knowledge of the non-linear mobility. We demonstrate the use of this method by measuring energy relaxation of SSE at 1.6 K in a microchannel device with 0.6µm deep helium. In this regime, both vapor atom scattering and 2-ripplon scattering contribute to energy relaxation to which we compare our measurements. We conclude that this technique provides a reliable measure of electron temperature while requiring a less detailed understanding of the electron interactions with the environment than previously utilized thermometry techniques.Surface state electrons (SSE) above superfluid Helium-4 constitute a remarkable non-degenerate twodimenstional electron gas (2DEG) [1,2]. These SSE float in the vacuum ∼ 11nm above the superfluid surface due to a confining potential formed by an attractive image charge in the helium and a repulsive barrier at the surface. SSE exhibit exceptional isolation from the environment. Elastic scattering processes are often used to describe the interaction of SSE with the environment using the electron mobility, which can reach values exceeding 10 8 cm 2 /Vs [3]. Of equal importance are the inelastic scattering processes which are characterized with the energy relaxation of SSE.There is a great deal of interest in understanding inelastic scattering of the SSE. Inelastic processes [4][5][6][7] are fundamental for understanding and describing a wide variety of SSE phenomena including non-linear transport [4,[8][9][10][11] and microwave absorption line shapes [12][13][14][15]. Further, renewed interest in these processes has emerged with the realization that the energy relaxation rates determine the coherence times of Rydberg state based SSE qubits [6,[16][17][18][19][20].Electron thermometry is crucial for experimental measurement of energy relaxation, but thermometry of hot SSE presents a serious challenge. The lack of ohmic contacts and the exceptionally low densities preclude the use of many electron thermometry techniques developed for solid state systems [21]. Instead, a common measure of the electron temperature, T e , has relied on the non-linear mobility of SSE [9,10,[22][23][24][25][26]. While this approach has proven fruitful, the relationship between the mobility and T e can be complex and is known only under limited experimental conditions. While other approaches to electron thermometry have been demonstrated for SSE, they are either confined to the Wigner crystal regime [27] or unable to measure the temperature of hot electrons [28].In this paper, we describe and demonstrate the use of the Seebeck effect to measure the temperature of hot SSE in a helium microchannel device. With the known thermopower of a non-degenerate 2DEG, we show that density measurements of a locally heated region of SSE can be related to a change in electron temperature. Follow-b...

show abstract