Interfaces: Hetero- and Collegial A Tribute to Herb Kroemer
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Transcript of Interfaces: Hetero- and Collegial A Tribute to Herb Kroemer
Interfaces: Hetero- and CollegialA Tribute to Herb Kroemer
Evelyn L. HuHarvard School of Engineering & Applied Sciences
Circa 1980’s . . . ‘come join UCSB’
Jim Merz
‘ We have Herb Kroemer!’
Hetero-interfaces: powerful concept, unifying theme
INTERFACES (at ‘home’)• Hetero-interfaces
− scientifically rich− broad applications
• Collegial interfaces– collaborative environment– broadened impact
Herb:• generated the fundamental ideas• delineated the band structure• brought in MBE to give form to idea
Opportunities at Interfaces
Bandgaps and offsets
6.1 angstrom materials
‘Quantized Conductance’
Quantized Conductance in InAs wires:The exceptional mobility of electrons, and the smooth interfaces ofInAs ‘wires’
with Steve Koester,Colombo Bolognesi,Mason Thomas(~ 1992)
at the interfaces of the ‘6.1’ materials
Transport between superconductors and semiconductors
Exceptional Conductance at low T, zero voltage:Andreev Reflections
with Chanh Nguyen,Mason Thomas(~ 1992)
A healthy skepticism, critical judgment, with an openess to new ideas
The vision to embrace‘blue sky’ and follow it toapplications.
Sharing ideas to promote new collaborations
Interfaces Produce Opportunities
Center for Quantized Electronic Structures
1989 - 2000
Interfaces that generate ideas, guidance, collaborations
Where is the Fermi level?
Type I? Type II?
The interface is key !
Innovator, standard bearer, teacher, mentor, collaborator…Thank you, Herb!