Tunneling PH671 - Transport. Tunneling (MIM) Scanning tunneling microscopy (STM)

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Presentation transcript:

Tunneling PH671 - Transport

Tunneling (MIM)

Scanning tunneling microscopy (STM)

HOPV graphite

Different information

Tunneling current

f is a step function tip has a flat DoS

Tunneling current WKB Approx for M m : mass of the electron s : width of the barrier (tip-sample separation) φ : barrier height- (mix of W tip and W sample )

Tunneling current probes distance Differential conductance probes density of states

STM measurements

Bi2Sr2CaCu2O8+x NbSe2 Bi2Se3

MIM diodes Adv. Mater. 2011, 23, 74–78 Explain the form of the I- V curve. What are the work functions of the two metals?

Graphene HET Nano Lett. 2013, 13, 2370−2375

Graphene HET Nano Lett. 2013, 13, 2370−2375 Explain the form of the I-V curve. How does the device work?

Graphene HET Nano Lett. 2013, 13, 2370−2375

TMR Junction Ref?

TM Junction Explain the tuneling effect

The spin valve is the simplest magnetoresistive device. Two ferromagnetic layers separated by a metallic spacer. One FM layer is pinned; the other is free to switch between parallel and antiparallel alignments corresponding to the low and high resistivity states, respectively. If the magnetization in the two layers is parallel => easy passage of spin polarized electrons ; if not then very difficult passage. “GMR” = giant magnetoresistance Already (1997) in your computers - market was worth billions. Now (2000’s) replaced by magnetic tunnel junctions. SPINTRONICS

Star formation

Formation of life … Accelerated chemistry in the reaction between the hydroxyl radical and methanol at interstellar temperatures facilitated by tunneling, Robin J. Shannon, Mark A. Blitz, Andrew Goddard & Dwayne E. Heard, Nature Chemistry 5, 745–749 (2013) doi: /nchem.1692