| CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES |
|
|
|
|
Thermal Shot Noise through Boundary Roughness of Carbon Nanotube Quantum Dots |
| Attia A. Awadalla1, Adel H. Phillips2**
|
1Department of Physics, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
2Department of Engineering Physics and Mathematics, Faculty of Engineering, Ain Shams University, Cairo, Egypt
|
|
| Cite this article: |
|
Attia A. Awadalla, Adel H. Phillips 2011 Chin. Phys. Lett. 28 017304 |
|
|
|
|
Abstract Thermal shot noise, thermal voltage and thermo power are studied through a carbon nanotube quantum dot coupled to two leads with random roughness of amplitude on each of the two boundaries, under the effect of microwave field, and magnetic field. The expressions for the thermal shot noise and thermal energy are deduced when the barrier strength and contact area are taken into consideration. A model for such mesoscopic devices is proposed as a carbon nanotube quantum dot coupled to two leads with random roughness of amplitude on each of the two boundaries. The results show oscillatory behaviors of the dependence of the thermal shot noise on the studied parameters. The thermopower oscillates with the variation of the contact area, and the peak heights decrease linearly with the contact area and increases with temperature. This trend of behavior is due to the interplay of the induced microwave photons and the tunneling rate through the side bands. This research is important for using a model as a high-frequency shot noise detector and the thermopower is sensitive to the energy dependence of the conductance.
|
| Keywords:
73.23.-b
73.40.-c 73.63.-b
|
|
|
Received: 09 October 2010
Published: 23 December 2010
|
|
|
|
|
|
|
|
[1] Chaikin P M, Kresin V Z and Little W A 1990 Organic Superconductivity (New York: Plenum) p 101
[2] Castro Neto A H, Guinea F, Peres N M R, Novoselov K S and Geim A K 2009 Rev. Mod. Phys. 81 109
[3] Landauer R 1970 Philos. Mag. 21 863
[4] Buttiker M 1986 Phys. Rev. Lett. 57 1761
[5] Reznikov M, Heiblum M, Shtrikman H and Mahalu D 1995 Phys. Rev. Lett. 75 3340
[6] Wyss Rolf A, Eugster C C, Del Alamo J A and Hu Q 1993 Appl. Phys. Lett. 63 1522
[7] Hu Q 1993 Appl. Phys. Lett. 62 837
[8] Arnone D D, Frost J E F, Smith C G, Jones G A C, Butcher R J and Pepper M 1995 Appl. Phys. Lett. 66 3149
[9] Tworzydlo J, Trauzett el B, Titov M, Rycerz A and Beenakker C W J 2006 Phys. Rev. Lett. 96 246802
[10] Mina A N et al 2010 Prog. Phys. 4 61
[11] Awad Alla A et al 2010 Int. J. Nanosci. (accepted)
[12] Van Houten H and Beenakker C W J 1996 Phys. Today 49(2) 22
[13] Nauen A, Hohls F et al 2004 Phys. Rev. B 70 033305
[14] Xia K, Kelly P J et al 2002 Phys. Rev. Lett. 89 166603
[15] Parsons A et al 200 Phys. Rev . B 67 140502(R)
[16] Awad Alla A A 2006 Appl. Sci. 8 23
[17] Williamson G, Kouwenhoven L P, van der Marel D, Foxon C T 1988 Phys. Rev. Lett. 60 848
[18] Van Wees H, Kouwenhoven C L P et al 1991 Phys. Rev . B 43 12431
[19] Awad Alla A A et al 2007 Int. J. Nanosci. 6(1) 41
[20] Zhou F, Seol J H, Moore A L, Ye Q L and Scheffler R 2006 J. Phys.: Condens. Matter 18 9651
[21] Awad Alla A A and Phillips A H 2007 Int. J. Mod. Phys. B 21 5381
[22] Lin Y M, Dimitrakpoulos C, Jenkins K A, Farmer D B, Chiu H Y, Grill A and Avouris P 2010 Science 327 (5966) 662
[23] Awad Alla A A and Phillips A H 2007 Chin. Phys. Lett. 24 1339
|
|
Viewed |
|
|
|
Full text
|
|
|
|
|
Abstract
|
|
|
|
|
