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1 (quantum ot) f f = 0,1,,3 D f (E) m 3 D 3 (E) = E, π 3 D (E) = m π H(E), D 1 (E) = 1 m π E, D 0 (E) = δ(e) (5.1a) (5.1b) (5.1c) (5.1) E = ( ) 3 f f 1 f 0 f D(E) D(E) D(E) D(E) E E E E 5.1 ( f D(E) 11-1

2 FET 5. FET (a) 5.(b) QPC ( ) 5.(c) 1 (a) (b) (c) ソースソースドットドットドットドレインドレインゲートゲートゲートトンネル トンネル 5. (a) (b) (c) ( ) 11-

3 (Frank-van er Merve, FvM) (5.3(a)) 3 - (Volmer-Weber, VM) (5.3(b)) 3 - (Stranski-Krastanow, SK) (5.3(c)) (a) (b) (c) 5.3 (a) Frank-van er Merve (b) Volmer-Weber (c) Stranski-Krastanow SK 5.4 GaAs 7% InAs In InAs In 3 SK SK InAs ( ) InSb InAs 5nm 100nm 3 m (a) (b) (с) 5.4 (a) GaAs(001) InAs InAs RHEED RHEED (b) (c) STM 11-3

4 ( ) (Coulomb blockae) C 1 E c = e /C C ( ) U N E cn = N C U = N(N 1)U = U(N 1/) N N +1 U 8 (5.) E + (N) = (N 1)U (5.3) E + (N)N (5.3) N 5.. N µ N N 0 µ N0 < E F < µ N0+1 µ E F (V s (G(0)) E F V g G N+1 N+ E F U E F E F E F N+1 N N N V g N (a) (b) (c) V g 5.5 (a) U E F ( )(b) V g E F (c) (a)(b) V g G ( ) 11-4

5 Ne ot Q H( N, Vg) C Q1 V C g V g J N=0 1 V g 5.6 (a) ( C C g (b) V g H(N,V g] ) (a) (b) µ N0 5.5(a), (b) G(0) V g G(0) V g 5.5(c) G(0) 5.6(a) e Q 1 +Q = en,,q 1 = CV, Q = C g (V V g ) (5.4) E = 1 CV + 1 C g(v V g ) (5.5) 0 V g (enthalpy) H = U PV PV (5.4)(5.5) H(N,V g ) = (Ne C gv g ) (C +C g ) 5.6(b) N 5.7 E F (a)(c) (b) V g E F (5.6) V s () (b) (a) (e) (c) V g 5.7 (a)(c) (b) () (a) (e) (c) 11-5

6 Conuctance (e /h) Vs (mev) Conuctance (e /h) Vg (V) 図 5.8 ヘテロ接合から作製した量子ドット伝導に現れたクーロンダイアモンド構造 横軸はゲート電圧 (Vg ) 上図は零バイアス伝導度でクーロン振動が現れている 下図は Vg -Vs 平面に伝導度をカラープロットしたもの で ダイアモンド構造が生じている ダイアモンドの外側に見える筋状の構造は 励起状態を通した伝導によっ て生じている クされる ソース電圧を上げ 従ってソースの EF を下げると () の点で一旦外れた (a) で伝導に使っていた化 学ポテンシャル位置がソース-ドレインの EF の間に入ってくるので 伝導が現れる 下げると 同様に (e) の点で (c) で伝導に使っていた化学ポテンシャル位置がソース-ドレイン間に入って伝導が現れる 結局黄色い平行四辺形の 内部でクーロンブロッケードが生じ 外部では伝導が生じることになる この平行四辺形をクーロンダイアモンド (Coulomb iamon) と呼んでいる*1 図 5.8 にクーロンダイアモンドの実測例をカラープロットで示した ダイアモンドの大きさが不揃いなのは 主に 次に述べる量子閉じ込めによる軌道エネルギー離散化の効果である また Vg に対して大きさが単調に変化してい るが これは回路的には主に Vg によりドットの大きさが変化しており 有効な静電容量が単調に変化することによ るものである いずれも 主に と断ったように この他にも様々な効果がダイヤモンドの大きさを決める 逆にダ イヤモンドの大きさその他細かな測定結果から量子ドットの様々な物理的性質を調べることができる [] ダイアモンドの外側に 筋状の構造が見えているのは ドット内の量子閉じ込め準位離散化 (次節) によるものであ る また この構造のオーバーラップによってはっきりしなくなっているが 可能な化学ポテンシャル準位の増加に よっても外側にもタイル状にダイアモンドが現れ これはクーロン階段 (Coulomb staircase) 構造と呼ばれている 実験で見えているダイアモンドは 図 5.7 と違って 縦の境界が垂直ではなく傾いている これは ソースに加えた 電圧が ソースとドットとの間のキャパシタンスを通じてドットの電位にも影響を与えているためである 5..3 量子閉じ込め 次に 閉じ込めによる軌道エネルギーの離散化が無視できない場合を考えよう 軌道エネルギー最低準位から数え て i 番目の1電子準位 (縮退準位はそれぞれすべて縮重分の数の準位として数える) エネルギーを ǫi とする N に関 係のない項を無視すると エンタルピー H は H(N ) = *1 (N e Cg Vg ) + ǫn Cs (5.7) 平行四辺形 (parallelogram) なのに菱形 (iamon) とは変だ と思われたであろうが 対称な電源配置で対称形の場合には菱形になるこ とから来ている 11-6

7 (a) (b) V I ƒ\ [ƒx( n-gaas) ÊŽqƒhƒbƒg(InGaAs) (c) 0 ƒq [ƒg É 6 N= (pa) 10 N=0 4 6 ƒhƒœƒcƒ ( n-gaas) E (N) (mev) D=0.5 m ƒq [ƒg ˆ³ (V) Žq N 5.9 ( (a) ) (a) N = 0 (b) [?] H(N,N +1) = H(N +1) H(N) = e {( N + 1 } )e C g V g + ǫ N ǫ N ǫ N+1 ǫ N C s V gx (N,N +1) = 1 {( N + 1 ) e+ C } s C g e ǫ N. (5.8) (??) ǫ N (aition energy spectroscopy) ǫ N = 0 (Kramers) 5.9(a) V g xy V(x,y) ω 0 V(x,y) = mω 0 (x +y ), E nh = ω(n h +1) (n h = 0,1,, ) (5.9) l n r n h = n r + l n h (n r,l) n h +1 E nh (n h +1) 5.9(a) N 5.9(b) N =,6,1 nh j=0 (n h +1) = (n h +1)(n h +) n h ω 0 N N = (n h +) (4,9) 11-7

8 l V eff (x,y) = mω (x +y ), Ω ω0 +(ω c/) (5.10) ω c B ω c = eb/m (n r,l) E(n r,l) = Ω(n r + l +1)+ ω c l/ (5.11) (5.11) - (5.11) 5.10(a) B n L n r +( l +l)/ E(n r,l) = ω c (n L +1/) 5.10(a) 5.10(a)N = 1 N (n r,l) = (0,1) ( ) (n r,l) = (0, int(n/)) (int(x)x ) Ω+ ω c / = Ω(int(N/)+1) ω c int(n/)/ ( ωc ) 1 = int(n/) + ω int(n/) (5.1) 1 E ( n r, l )/ h N=1 n 1st ƒs [ƒnƒq [ƒg ˆ³(V) (a) c Šრƒ ƒ_ƒe ˆÊ (b) 1.5 N= Ž ê(t) 5.10 (a) - 10 N = 1 (b)5.9 (5.1) N = 3 6 ω 11-8

9 N 5.10(b) N = 3 6 ω N N = (Fano effect) T (ε) q= ε =(E E 0 )/Γ 0 π T( ǫ) ( ǫ+q) ǫ +1, ǫ E E 0, (5.13) Γ q q q = 0 [] ** AB T S 5.11 S S b = ( ) cosθ isinθ, S isinθ cosθ = ( ) 0 e ik e ik 0 k T S k 5.11(a) π Re(z) < 0 π/ π/ π (5.14) 11-9

10 / 0 0 e ik e ik 0 1 cos isin isin cos cos isin isin cos ß / /4 ˆÊ ŠƒVƒtƒg 0 /4 0 / k ( ƒq [ƒg ˆ³ É Š ) (a) (b) (c) 5 k (a) ( ( )k 0.7(b) AB + k( ) φ??(a)ab S w(a) S S AB (c)(b) φ/φ 0 =0, 0.01, 0.19, 0.9, 0.38, 0.48 k 0.95 (b) B (T) G (e /h) 0.40 φ= V g (V) 0.30 G (e /h) 0.30 φ 0 / φ 0 / V g (V) (a) (c) 5.1 (a)ab (b) (c) φ = 0 [1] 11-10

11 AB S 0 1/ 1/ S t = 1/ 1/ 1/ 1/, (5.15) 1/ 1/ AB ( ) 0 e iθ AB S AB =, θ π φ = e e iθab 0 φ 0 φ (φ ) (5.16) S (5.14) 5.11(b), (c) ((5.13) q)(c) φ (a) π 5.1 ( )AB 5.3. G 7 ( ) (quantum entanglement) (Kono effect) (Kono problem) (renormalization group theory) ( ) G H T H T H T 1( ) Lanauer e /h e /h

12 e / h lnt.0 G ( ` ± x ) ` ± x (e /h) T K T ƒq [ƒg ˆ³(mV) (a) (b) 5.13 (a) lnt T K (e /h) ( )(b) [1] K. Kobayashi et al., Phys. Rev. Lett. 88, (00); Phys. Rev. B 68, (003). [] ( 014) [3] ( 1983) ( 1991) [4] Yu. V. Nazarov an Y. M. Blanter, Quantum Transport (Cambrige, 009). G (n = 1) 1/ 1 E + E E + = µ µ = ǫ 0 +U µ, E = µ µ 1 = µ ǫ 0 (G.1) h/ E ± H T γl γ R E, γl γ R E + (G.) (co-tunneling) H = H leas +H ot +H T (G.3) { ckσ = (γ Lc L,kσ +γ Rc R,kσ )/γ c kσ = ( γ R c L,kσ +γ L c R,kσ )/γ, γ γ L +γ R (G.4) 11-1

13 1) k k ) k k 3) k k k 4) k k k ) 4) (G.8)(G.9)1) 4) H T = k,σ [(γ L c L,kσ +γ Rc R,kσ ) σ +h.c.] = [γc kσ σ +h.c.] k,σ (G.5) c kσ * Anerson H = kσ ǫ k c kσ c kσ + σ ǫ σ σ + kσ (γc kσ σ +h.c.)+u (G.6) ǫ < E F < ǫ +U (G.7) (s ) ( ) (V k ) co-tunneling (ψ ) 4 (Pauli ) 1) k k ) k k ( ) 3) k k ( ) 4) k, k ( ) * c k σ c kσ k ( ) 11-13

14 1) γ E +c k c k, ) γ E +c k c k, 3) γ E c k c k γ, 4) E c k c k. ψ 4 kσ γ γ E σ σ + E +c k σ c kσ kk σ + kk γ ( 1 E E ) (c k c k +c k c k +c k c k +c k c k ). (G.8) (G.9) (G.10) 1 3)k = k k c k c k = 1c k c k = 0 1) ψ = 0 = 1 = 0 3) ),4) 3 c k c k +c k c k = 1 (c k c k c k c k )( )+ 1 (c k c k +c k c k )( + ) Ŝ Ŝ z = 1 ( ), Ŝ + =, Ŝ = (G.10) 3 (H,H s ) H = kk σ H s = kk γ [ 1 E + k γ [ 1 E + k 1 ( 1 E + k + 1 E k )] c k σ c kσ, + 1 ] ] [Ŝ+ E c k c k +Ŝ c k c k +Ŝz(c k c k c k c k ) k (G.11) (G.1) k ( 1 J = γ E ) E (G.13) H = ( J ) c k σ c kσ kk (G.14) H s = J ] [Ŝ+ c k c k +Ŝ c k c k +Ŝz(c k c k c k c k ) kk = J ] [(Ŝx +iŝy)(ŝ xj iŝ yj )+(Ŝx iŝy)(ŝ xj +iŝ yj )+ŝ zj Ŝ z (G.15) j = J j ŝ j Ŝ s j s (s)- ( ) (G.4) - H T H H s H eff = ǫ k c kσ c kσ +J ] [Ŝ+ c k c k +Ŝ c k c k +Ŝz(c k c k c k c k ). (G.16) kσ kk 11-14

15 k k H T 5.15 H T k k (Schrieffer-Wolff ) (G.16) Born (G.16) J (γ 4) ˆT ( H T = H s ) L R ˆT = H T +H T 1 ǫ H 0 +iδ H T + Γ L R = π Rk ˆT Lk δ(ǫ Rk ǫ Lk )f(ǫ Lk µ L )[1 f(ǫ Rk µ R )] k,k (G.17) (G.18) k k J 5.15 ;k ˆT (1) ;k = J/ (G.19) H T γ ( Jγ ) (G.) J ;k ˆT () ;k (5.16,5.17) (5.16(a)) (5.16(b)) *3 ( ) J 1 ǫ ǫ q q +iδ [1 f(ǫ q)]+ q = ( ) J 1 ǫ ǫ q q +iδ ( ) J 1 ǫ (ǫ ǫ q )+iδ f(ǫ q) ( ) J D = ǫ 1 ν D ǫ ǫ ν : Density of states +iδ ( ) ] J = ν[ ln D +ǫ D ǫ iπ. (G.0) [ D,D] ν 5.17 (a) 3/ (b) - *3 ( ) 11-15

16 (a) q k k k k H T H T H T H T q (b) 5.16 H T (a) (b) H T (a) q k k?? k k (b) H T q H T (a) 3/ (b) - q J 1 D ǫ ǫ q +iδ f(ǫ q) = J ν D { J νln ǫ /D ǫ k B T J νlnk B T/D ǫ k B T 1 ǫ ǫ +iδ f(ǫ )ǫ (G.1) ǫ - *4 ( ) s (G.15) co-tunneling *4 Ŝ + Ŝ ( Ŝ z ) 11-16

17 1 E a b x V 0 T E/V k 0 mv 0/ k 0a0.5( ).0 k 0b5.0 ( ) (Kono clou) ( ) ( ) 5.18 ( ) τ a h/τ a (= ΓΓ ) T K (G.1) (G.1) J J νlnk B T K /D J k B T K De Jν J T K ν 11-17

18 D T K JD D q 11-18

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