Barrier penetration and screening effects on hole mobility and thermopower in a Si/Si1-xGex/Si finite square quantum well

Tuan, Truong Van; Tai, Vo Van; Linh, Dang Khanh

doi:10.1007/s12648-023-02662-7

Cited by 2 publications

(2 citation statements)

References 24 publications

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“…Trong vài thập kỷ gần đây, rất nhiều nghiên cứu về các tính chất của graphene và các cấu trúc tương tự đã được thực hiện kể cả thực nghiệm và lý thuyết [1][2][3][4][5][6] của Q2DEG đã được xem xét trong các công trình của Smith và Butcher 11 và của chúng tôi 12 . Gần đây Chinnappagoudra và cộng sự 13 chỉ ra rằng hiệu ứng chắn làm giảm các tính chất nhiệt điện của BLG đến vài bậc.…”

Section: Giới Thiệuunclassified

“…Mối liên hệ giữa hiện tượng nhiệt và điện này gọi là hiệu ứng nhiệt điện. Suất nhiệt điện là một đại lượng đặc trưng của hiệu ứng nhiệt điện 12,18,19 . Ở nhiệt độ thấp, gradient nhiệt độ ∇T sinh ra dòng xung lượng phonon kéo theo hạt tải điện do tương tác phonon-hạt tải, gây ra suất nhiệt điện phonon drag S g 7 ,…”

Section: Phương Phápunclassified

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Study the effects on the phonon drag Seebeck coefficient of bilayer graphene and bilayer graphene−bilayer graphene double layers

Van Tuan,

Quoc Khanh

2023

Sci. Tech. Dev. J. - Nat. Sci.

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This paper presented the investigation of the influence of the temperature−dependent screening effect on the Seebeck phonon drag coefficient Sg of a monolayer of bilayer graphene (BLG) and a BLG−BLG double layer placed in an air environment. For a system in an air environment, the two-dimensional electrons of the BLG was assumed to interact only with the intralayer deformation acoustic potential phonons in the BLG. After reviewing the results published by Kubakaddi and Bhargavi, “Enhancement of phonon-drag thermopower in bilayer graphene” in Phys. Rev. B 82, 155410 (2010), this paper expanded the mentioned-results to encompass the screening and double layers and found that the phonon drag coefficient in the BLG monolayer system was strongly reduced by the screening effect, even up to several orders of magnitude compared to the zero temperature screening function, as shown in some recent publications. When comparing the effect of electron screening in the second layer on electron-phonon interaction in the remaining layer, or on the intralayer screening function, the distance between the two layers was small. The screening effect of the second layer significantly reduced the magnitude of the phonon drag Seebeck coefficient Sg in the BLG-BLG double layer. The effect of temperature, layer spacing and particle density on Sg for symmetric and asymmetric systems with varying layer densities were also investigated.

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Section: Giới Thiệuunclassified

Section: Phương Phápunclassified

Study the effects on the phonon drag Seebeck coefficient of bilayer graphene and bilayer graphene−bilayer graphene double layers

Van Tuan,

Quoc Khanh

2023

Sci. Tech. Dev. J. - Nat. Sci.

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Screening effect on the phonon drag induced seebeck coefficient in bilayer graphene/quasi-two-dimensional electron gas structures

Van Tuan,

Khanh,

Van Tai

et al. 2024

Phys. Scr.

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In this work, we investigate the impacts of the temperature-dependent screening effect on the Seebeck coefficient originating from the phonon drag, namely phonon—drag thermopower S g , of a double layer system consisting of bilayer graphene (BLG) separated from a quasi-two-dimensional electron gas (q2DEG) by an air medium (hereafter referred to as BLG-q2DEG). For such a system, we can assume that the two-dimensional (2D) electrons in BLG only interact internally with acoustic phonons. We consider the effects of screening induced by the 2D electrons in q2DEG on the electron–phonon interactions in BLG by comparing with the results obtained when only using the monolayer screening function in BLG. The monolayer screening functions in BLG (q2DEG) do not depend on the distance d between the two layers, and the screening function of the double layer system approaches the respective monolayer screening functions for large d. When taking into account of the screening effect caused by charged carriers in both layers, S g of a BLG-q2DEG decreases compared to the case of only considering the monolayer screening effect, especially in the low-T regime. With different carrier densities in the two layers N s BLG ≠ N s GaAs , it has shown that S g strongly depends on BLG. Besides, when changing the width L of the q2DEG such as GaAs quantum well, the double layer screening function makes S g increase for small L and negligibly affects S g for large L. On the contrary, the monolayer screening functions make S g decrease for large L. The monolayer screening functions cause S g to increase for N s BLG < N s GaAs .

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Barrier penetration and screening effects on hole mobility and thermopower in a Si/Si1-xGex/Si finite square quantum well

Cited by 2 publications

References 24 publications

Study the effects on the phonon drag Seebeck coefficient of bilayer graphene and bilayer graphene−bilayer graphene double layers

Study the effects on the phonon drag Seebeck coefficient of bilayer graphene and bilayer graphene−bilayer graphene double layers

Screening effect on the phonon drag induced seebeck coefficient in bilayer graphene/quasi-two-dimensional electron gas structures

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