Decoherence and the Thouless Crossover in One-Dimensional Conductors

Khavin, Yu. B.; Gershenson, M. E.; Bogdanov, A. L.

doi:10.1103/physrevlett.81.1066

Cited by 60 publications

(82 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Again a perfect agreement between the maximum measured value L ϕ and the one derived from our theory is found for all V g . Table 2 V g , V n, The temperature dependence of the data L ϕ [20] is also in excellent agreement with our predictions at all T , see Fig. 3.…”

Section: Discussion Of Experimentssupporting

confidence: 76%

“…[19], the length and the width of the wires were 500 µm and 0.05 µm respectively. Experimental results for 3 different values of the gate voltage V g [20] are presented in the Table 2 together with our theoretical predictions. Again a perfect agreement between the maximum measured value L ϕ and the one derived from our theory is found for all V g .…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

“…Very recently new measurements of the dephasing time τ ϕ in quasi 1d δ-doped GaAs structures with few conducting channels were reported [20]. The typical effective resistance of the samples [20] was 6 ÷ 30 MΩ, i.e.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

“…The typical effective resistance of the samples [20] was 6 ÷ 30 MΩ, i.e. it was even higher than in Ref.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

See 3 more Smart Citations

Interaction and quantum decoherence

Golubev

Zaikin

1998

Physica B: Condensed Matter

View full text Add to dashboard Cite

We discuss a fundamental effect of the interaction-induced decoherence of the electron wave function in disordered metals. In the first part of the paper we consider a simple model of a quantum particle interacting with a bath of harmonic oscillators and analyze the physical origin of the effect. This exactly solvable model also allows to understand why the arguments against the existence of the effect at low temperatures fail. The second part of the paper is devoted to a rigorous analysis of quantum decoherence in disordered metals. We also discuss the relation of our results to the recent experiments on GaAs structures. The existence of a finite quantum decoherence rate at low T implies that low dimensional disordered metals with generic parameters do not become insulators even at T = 0.

show abstract

Section: Discussion Of Experimentssupporting

confidence: 76%

Section: Discussion Of Experimentsmentioning

confidence: 99%

Section: Discussion Of Experimentsmentioning

confidence: 99%

“…The typical effective resistance of the samples [20] was 6 ÷ 30 MΩ, i.e. it was even higher than in Ref.…”

Section: Discussion Of Experimentsmentioning

confidence: 99%

See 2 more Smart Citations

Interaction and quantum decoherence

Golubev

Zaikin

1998

Physica B: Condensed Matter

View full text Add to dashboard Cite

show abstract

“…Detection of a very weak MW noise that is sufficient to destroy the phase coherence at ultra-low temperatures is a challenge. Indeed, the MW-induced dephasing may occur without an easily-observable electron overheating if the electrons in a wire can efficiently dissipate their energy in the environment [10]. The possibility of "noisedephasing-without-overheating" has not been ruled out in the experiments [7,9,11].…”

mentioning

confidence: 99%

Microwave-Induced Dephasing in One-Dimensional Metal Wires

2006

View full text Add to dashboard Cite

We report on the effect of monochromatic microwave (MW) radiation on the weak localization corrections to the conductivity of quasi-one-dimensional (1D) silver wires. Due to the improved electron cooling in the wires, the MW-induced dephasing was observed without a concomitant overheating of electrons over wide ranges of the MW power PMW and frequency f . The observed dependences of the conductivity and MW-induced dephasing rate on PMW and f are in agreement with the theory by Altshuler, Aronov, and Khmelnitsky [1]. Our results suggest that in the lowtemperature experiments with 1D wires, saturation of the temperature dependence of the dephasing time can be caused by an MW electromagnetic noise with a sub-pW power. The processes of dephasing of electron wave function are central to the electronic transport in mesoscopic systems [2]. The dominant low-temperature dephasing mechanism in low-dimensional conductors is the scattering of an electron by equilibrium fluctuations of the electric field in the conductor, i.e. the Nyquist (Johnson) noise [3]. The Nyquist dephasing time τ ϕ increases with decreasing temperature as T −2/3 in the quasi-onedimensional (1D) conductors with the cross-sectional dimensions much smaller than the dephasing length L ϕ = Dτ ϕ (D is the electron diffusion constant) [3]. In the 1D metallic wires, this mechanism typically governs the dephasing at T < 1K [4,5,6].Recently, the interest in the fundamental limitations on τ ϕ was invigorated by the reports on the saturation of τ ϕ (T ) dependences in one-and zero-dimensional systems at ultra-low temperatures (see, e.g. [7,8]). The experiments [6] demonstrated that, at least in some studied 1D wires, this saturation could be attributed to the presence of localized spins in a small concentration undetectable by analytical methods. However, the problem of τ ϕ (T ) saturation in the most "clean" samples remained open [9]. One of the"extrinsic" mechanisms that might lead to the saturation of τ ϕ (T ) is the dephasing by the external microwave (MW) electromagnetic noise [1]. Detection of a very weak MW noise that is sufficient to destroy the phase coherence at ultra-low temperatures is a challenge. Indeed, the MW-induced dephasing may occur without an easily-observable electron overheating if the electrons in a wire can efficiently dissipate their energy in the environment [10]. The possibility of "noisedephasing-without-overheating" has not been ruled out in the experiments [7,9,11].In this Letter, we study the dephasing by monochromatic microwave radiation in 1D wires. By optimizing the sample design, we minimized electron overheating and observed for the first time the microwave-induced dephasing in 1D wires without a concomitant overheating of electrons. The dependences of the MW-induced dephasing rate on the MW power and frequency are in agreement with the theoretical predictions [1]. Our results suggest that the τ ϕ (T ) dependence in a 1D wire may be significantly affected by a sub-pW power of an external microwave noise absorbed in the sample...

show abstract

Low-temperature dephasing in disordered conductors: experimental aspects

Gershenson¹

1999

Ann. Phys.

View full text Add to dashboard Cite

What is the lowest temperature to which one can trace the growth of the dephasing time τϕ in low-dimensional conductors? I consider the fundamental limitation, the crossover from weak to strong localization, as well as several experimental reasons for frequently observed saturation of τϕ (hot-electron effects, dephasing by external noise). Recent progress in our understanding of the electron-phonon interaction in disordered conductors is also briefly discussed.

show abstract

Decoherence and the Thouless Crossover in One-Dimensional Conductors

Cited by 60 publications

References 17 publications

Interaction and quantum decoherence

Interaction and quantum decoherence

Microwave-Induced Dephasing in One-Dimensional Metal Wires

Low-temperature dephasing in disordered conductors: experimental aspects

Contact Info

Product

Resources

About