Effect of island length on the Coulomb modulation in single-electron transistors

被引:9
作者
Lu, JG
Hergenrother, JM
Tinkham, M
机构
[1] Harvard Univ, Dept Phys, Cambridge, MA 02138 USA
[2] Harvard Univ, Div Engn & Appl Sci, Cambridge, MA 02138 USA
来源
PHYSICAL REVIEW B | 1998年 / 57卷 / 08期
关键词
D O I
10.1103/PhysRevB.57.4591
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
We have studied single-electron transistors with island lengths of 2, 10, 20, 30, and 40 mu m and with high-resistance tunnel junctions to minimize the effects of cotunneling and electron self-heating. With longer islands, there is a marked reduction of the gate modulation of the Coulomb blockade width. According to orthodox theory, the width of the Coulomb blockade at T = 0 is equal to e/C-Sigma, and it falls approximately exponentially with k(B)T/E-c, where E-c = e(2)/2C(Sigma), and C-Sigma is the total capacitance. Based on numerical calculations and analytic estimates, we conclude that the modulation reduction is mainly due to the large increase in stray capacitance between the island and the leads as the island length is increased, and not to some more subtle nonequilibrium effect. When the increased capacitance is combined with the effect of electron heating, the Coulomb modulation is rapidly reduced. This work also demonstrates the need to take stray capacitance into account in addition to intrinsic junction capacitance even in structures that are only a few mu m long. [S0163-1829(98)07307-X].
引用
收藏
页码:4591 / 4598
页数:8
相关论文
共 16 条
[1]   COULOMB BLOCKADE OF SINGLE-ELECTRON TUNNELING, AND COHERENT OSCILLATIONS IN SMALL TUNNEL-JUNCTIONS [J].
AVERIN, DV ;
LIKHAREV, KK .
JOURNAL OF LOW TEMPERATURE PHYSICS, 1986, 62 (3-4) :345-373
[2]  
AVERIN DV, 1992, SINGLE CHARGE TUNNEL
[3]  
DELSING P, 1992, SINGLE ELECT TUNNELI
[4]   THERMAL ENHANCEMENT OF COTUNNELING IN ULTRA-SMALL TUNNEL-JUNCTIONS [J].
EILES, TM ;
ZIMMERLI, G ;
JENSEN, HD ;
MARTINIS, JM .
PHYSICAL REVIEW LETTERS, 1992, 69 (01) :148-151
[5]   FABRICATION AND CHARACTERIZATION OF SINGLE-ELECTRON TUNNELING TRANSISTORS IN THE SUPERCONDUCTING STATE [J].
Hergenrother, J. M. ;
Tuominen, M. T. ;
Tighe, T. S. ;
Tinkham, M. .
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY, 1993, 3 (01) :1980-1982
[6]   CHARGE-TRANSPORT BY ANDREEV REFLECTION THROUGH A MESOSCOPIC SUPERCONDUCTING ISLAND [J].
HERGENROTHER, JM ;
TUOMINEN, MT ;
TINKHAM, M .
PHYSICAL REVIEW LETTERS, 1994, 72 (11) :1742-1745
[7]  
HERGENROTHER JM, 1995, THESIS HARVARD U
[8]  
Ingold G.-L., 1992, SINGLE CHARGE TUNNEL
[9]  
JU JG, 1997, THESIS HARVARD U
[10]   SELF-HEATING IN THE COULOMB-BLOCKADE ELECTROMETER [J].
KAUTZ, RL ;
ZIMMERLI, G ;
MARTINIS, JM .
JOURNAL OF APPLIED PHYSICS, 1993, 73 (05) :2386-2396