Boron Nitride on Cu(111): An Electronically Corrugated Monolayer
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- 作者：Sushobhan Joshi ; David Ecija ; Ralph Koitz ; Marcella Iannuzzi ; Ari P. Seitsonen ; J眉rg Hutter ; Hermann Sachdev ; Saranyan Vijayaraghavan ; Felix Bischoff ; Knud Seufert ; Johannes V. Barth ; Willi Auw盲rter
- 刊名：Nano Letters
- 出版年：2012
- 出版时间：November 14, 2012
- 年：2012
- 卷：12
- 期：11
- 页码：5821-5828
- 全文大小：409K
- 年卷期：v.12,no.11(November 14, 2012)
- ISSN：1530-6992
文摘
Ultrathin films of boron nitride (BN) have recently attracted considerable interest given their successful incorporation in graphene nanodevices and their use as spacer layers to electronically decouple and order functional adsorbates. Here, we introduce a BN monolayer grown by chemical vapor deposition of borazine on a single crystal Cu support, representing a model system for an electronically patterned but topographically smooth substrate. Scanning tunneling microscopy and spectroscopy experiments evidence a weak bonding of the single BN sheet to Cu, preserving the insulating character of bulk hexagonal boron nitride, combined with a periodic lateral variation of the local work function and the surface potential. Complementary density functional theory calculations reveal a varying registry of the BN relative to the Cu lattice as origin of this electronic Moir茅-like superstructure.