▁D * ▁→ ▁D p , ▁ μ * ▁→ ▁ μ p ▁and ▁ 1 / τ * ▁→ ▁ 1 / τ p . ▁The ▁sem icon duct or ▁behav es ▁as ▁if ▁there ▁were ▁only ▁holes ▁travel ing ▁in ▁it . ▁ ▁The ▁final ▁equation ▁for ▁the ▁carri ers ▁is : ▁ ▁This ▁can ▁be ▁interpreted ▁as ▁a ▁Di rac ▁delta ▁function ▁that ▁is ▁created ▁immediately ▁after ▁the ▁pul se . ▁Hol es ▁then ▁start ▁to ▁travel ▁towards ▁the ▁electro de ▁where ▁we ▁detect ▁them . ▁The ▁signal ▁then ▁is ▁Gaussian ▁curve ▁sh aped . ▁ ▁Param eters ▁ μ , ▁D ▁and ▁ τ ▁can ▁be ▁obtained ▁from ▁the ▁shape ▁of ▁the ▁signal . ▁ ▁where ▁d ▁is ▁the ▁distance ▁dr ift ed ▁in ▁time ▁t 0 , ▁and ▁ δ t ▁the ▁pul se ▁width . ▁ ▁See ▁also ▁ ▁Altern ating ▁current ▁Con du ction ▁band ▁Con ve ction – diff usion ▁equation ▁Direct ▁current ▁Dr ift ▁current ▁Free ▁electron ▁model ▁Random ▁walk ▁ ▁References ▁ ▁External ▁links ▁▁ ▁App let ▁sim ulating ▁the ▁Hay nes – S ho ck ley ▁experiment ▁ ▁Video ▁explaining ▁the ▁original ▁experiment ▁ ▁Edu c ational ▁approach ▁to ▁the ▁H S ▁experiment ▁ ▁Category : Sem icon duct ors ▁Category : Char ge ▁carri ers <0x0A> </s> ▁K har ai - ye ▁P ain ▁( , ▁also ▁Roman ized ▁as ▁K har ā ’ ī - ye ▁P ā ’ ī n ; ▁also ▁known ▁as ▁K har ā ’ ī